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[libc++] Implement P2505R5(Monadic operations for std::expected).

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Signed-off-by: yronglin <yronglin777@gmail.com>
This commit is contained in:
yronglin 2023-05-17 01:40:03 +08:00
parent 7f3047219c
commit ebc111b08b
29 changed files with 3114 additions and 36 deletions
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2
libcxx/docs/FeatureTestMacroTable.rst
View File

@ -320,7 +320,7 @@ Status
------------------------------------------------- -----------------
``__cpp_lib_constexpr_typeinfo`` ``202106L``
------------------------------------------------- -----------------
``__cpp_lib_expected`` ``202202L``
``__cpp_lib_expected`` ``202211L``
------------------------------------------------- -----------------
``__cpp_lib_format_ranges`` ``202207L``
------------------------------------------------- -----------------

1
libcxx/docs/ReleaseNotes.rst
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@ -41,6 +41,7 @@ Implemented Papers
- P1328R1 - ``constexpr type_info::operator==()``
- P1413R3 - Formatting ``thread::id`` (the ``stacktrace`` is not done yet)
- P2675R1 - ``format``'s width estimation is too approximate and not forward compatible
- P2505R5 - Monadic operations for ``std::expected``
Improvements and New Features
-----------------------------

4
libcxx/docs/Status/Cxx2bIssues.csv
View File

@ -274,7 +274,7 @@
"`3853 <https://wg21.link/LWG3853>`__","``basic_const_iterator<volatile int*>::operator->`` is ill-formed","February 2023","","",""
"`3857 <https://wg21.link/LWG3857>`__","``basic_string_view`` should allow explicit conversion when only traits vary","February 2023","|Complete|","17.0",""
"`3860 <https://wg21.link/LWG3860>`__","``range_common_reference_t`` is missing","February 2023","|Complete|","17.0","|ranges|"
"`3866 <https://wg21.link/LWG3866>`__","Bad Mandates for ``expected::transform_error`` overloads","February 2023","","",""
"`3866 <https://wg21.link/LWG3866>`__","Bad Mandates for ``expected::transform_error`` overloads","February 2023","|Complete|","17.0",""
"`3867 <https://wg21.link/LWG3867>`__","Should ``std::basic_osyncstream``'s move assignment operator be ``noexcept``?","February 2023","","",""
"`3441 <https://wg21.link/LWG3441>`__","Misleading note about calls to customization points","February 2023","","",""
"`3622 <https://wg21.link/LWG3622>`__","Misspecified transitivity of equivalence in §[unord.req.general]","February 2023","","",""
@ -301,7 +301,7 @@
"`3872 <https://wg21.link/LWG3872>`__","``basic_const_iterator`` should have custom ``iter_move``","February 2023","","",""
"`3875 <https://wg21.link/LWG3875>`__","``std::ranges::repeat_view<T, IntegerClass>::iterator`` may be ill-formed","February 2023","","","|ranges|"
"`3876 <https://wg21.link/LWG3876>`__","Default constructor of ``std::layout_XX::mapping`` misses precondition","February 2023","","",""
"`3877 <https://wg21.link/LWG3877>`__","Incorrect constraints on ``const``-qualified monadic overloads for ``std::expected``","February 2023","","",""
"`3877 <https://wg21.link/LWG3877>`__","Incorrect constraints on ``const``-qualified monadic overloads for ``std::expected``","February 2023","|Complete|","17.0",""
"`3878 <https://wg21.link/LWG3878>`__","import ``std;`` should guarantee initialization of standard iostreams objects","February 2023","","",""
"`3879 <https://wg21.link/LWG3879>`__","``erase_if`` for ``flat_{,multi}set`` is incorrectly specified","February 2023","","",""
"`3880 <https://wg21.link/LWG3880>`__","Clarify ``operator+=`` complexity for ``{chunk,stride}_view::iterator``","February 2023","","","|ranges|"

Can't render this file because it has a wrong number of fields in line 2.

2
libcxx/docs/Status/Cxx2bPapers.csv
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@ -100,7 +100,7 @@
"`P1478R8 <https://wg21.link/P1478R8>`__","LWG", "``Byte-wise`` ``atomic`` ``memcpy``", "November 2022","","","|concurrency TS|"
"`P2167R3 <https://wg21.link/P2167R3>`__","LWG", "Improved Proposed Wording for LWG 2114", "November 2022","","",""
"`P2396R1 <https://wg21.link/P2396R1>`__","LWG", "Concurrency TS 2 fixes ", "November 2022","","","|concurrency TS|"
"`P2505R5 <https://wg21.link/P2505R5>`__","LWG", "Monadic Functions for ``std::expected``", "November 2022","","",""
"`P2505R5 <https://wg21.link/P2505R5>`__","LWG", "Monadic Functions for ``std::expected``", "November 2022","|Complete|","17.0",""
"`P2539R4 <https://wg21.link/P2539R4>`__","LWG", "Should the output of ``std::print`` to a terminal be synchronized with the underlying stream?", "November 2022","","","|format|"
"`P2602R2 <https://wg21.link/P2602R2>`__","LWG", "Poison Pills are Too Toxic", "November 2022","","","|ranges|"
"`P2708R1 <https://wg21.link/P2708R1>`__","LWG", "No Further Fundamentals TSes", "November 2022","|Nothing to do|","",""

Can't render this file because it has a wrong number of fields in line 2.

620
libcxx/include/__expected/expected.h
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@ -14,10 +14,12 @@
#include <__expected/bad_expected_access.h>
#include <__expected/unexpect.h>
#include <__expected/unexpected.h>
#include <__functional/invoke.h>
#include <__memory/addressof.h>
#include <__memory/construct_at.h>
#include <__type_traits/conjunction.h>
#include <__type_traits/disjunction.h>
#include <__type_traits/integral_constant.h>
#include <__type_traits/is_assignable.h>
#include <__type_traits/is_constructible.h>
#include <__type_traits/is_convertible.h>
@ -60,7 +62,17 @@
_LIBCPP_BEGIN_NAMESPACE_STD
namespace __expected {
template <class _Tp, class _Err>
class expected;
template <class _Tp>
struct __is_std_expected : false_type {};
template <class _Tp, class _Err>
struct __is_std_expected<expected<_Tp, _Err>> : true_type {};
struct __expected_construct_in_place_from_invoke_tag {};
struct __expected_construct_unexpected_from_invoke_tag {};
template <class _Err, class _Arg>
_LIBCPP_HIDE_FROM_ABI void __throw_bad_expected_access(_Arg&& __arg) {
@ -72,8 +84,6 @@ _LIBCPP_HIDE_FROM_ABI void __throw_bad_expected_access(_Arg&& __arg) {
# endif
}
} // namespace __expected
template <class _Tp, class _Err>
class expected {
static_assert(
@ -166,6 +176,15 @@ private:
_Not<is_constructible<unexpected<_Err>, const expected<_Up, _OtherErr>&>>,
_Not<is_constructible<unexpected<_Err>, const expected<_Up, _OtherErr>>> >;
template <class _Func, class... _Args>
_LIBCPP_HIDE_FROM_ABI constexpr explicit expected(
std::__expected_construct_in_place_from_invoke_tag __tag, _Func&& __f, _Args&&... __args)
: __union_(__tag, std::forward<_Func>(__f), std::forward<_Args>(__args)...), __has_val_(true) {}
template <class _Func, class... _Args>
_LIBCPP_HIDE_FROM_ABI constexpr explicit expected(
std::__expected_construct_unexpected_from_invoke_tag __tag, _Func&& __f, _Args&&... __args)
: __union_(__tag, std::forward<_Func>(__f), std::forward<_Args>(__args)...), __has_val_(false) {}
public:
template <class _Up, class _OtherErr>
@ -538,28 +557,28 @@ public:
_LIBCPP_HIDE_FROM_ABI constexpr const _Tp& value() const& {
if (!__has_val_) {
__expected::__throw_bad_expected_access<_Err>(__union_.__unex_);
std::__throw_bad_expected_access<_Err>(__union_.__unex_);
}
return __union_.__val_;
}
_LIBCPP_HIDE_FROM_ABI constexpr _Tp& value() & {
if (!__has_val_) {
__expected::__throw_bad_expected_access<_Err>(__union_.__unex_);
std::__throw_bad_expected_access<_Err>(__union_.__unex_);
}
return __union_.__val_;
}
_LIBCPP_HIDE_FROM_ABI constexpr const _Tp&& value() const&& {
if (!__has_val_) {
__expected::__throw_bad_expected_access<_Err>(std::move(__union_.__unex_));
std::__throw_bad_expected_access<_Err>(std::move(__union_.__unex_));
}
return std::move(__union_.__val_);
}
_LIBCPP_HIDE_FROM_ABI constexpr _Tp&& value() && {
if (!__has_val_) {
__expected::__throw_bad_expected_access<_Err>(std::move(__union_.__unex_));
std::__throw_bad_expected_access<_Err>(std::move(__union_.__unex_));
}
return std::move(__union_.__val_);
}
@ -598,6 +617,245 @@ public:
return __has_val_ ? std::move(__union_.__val_) : static_cast<_Tp>(std::forward<_Up>(__v));
}
template <class _Up = _Err>
_LIBCPP_HIDE_FROM_ABI constexpr _Err error_or(_Up&& __error) const& {
static_assert(is_copy_constructible_v<_Err>, "error_type has to be copy constructible");
static_assert(is_convertible_v<_Up, _Err>, "argument has to be convertible to error_type");
if (has_value())
return std::forward<_Up>(__error);
return error();
}
template <class _Up = _Err>
_LIBCPP_HIDE_FROM_ABI constexpr _Err error_or(_Up&& __error) && {
static_assert(is_move_constructible_v<_Err>, "error_type has to be move constructible");
static_assert(is_convertible_v<_Up, _Err>, "argument has to be convertible to error_type");
if (has_value())
return std::forward<_Up>(__error);
return std::move(error());
}
// [expected.void.monadic], monadic
template <class _Func>
requires is_constructible_v<_Err, _Err&>
_LIBCPP_HIDE_FROM_ABI constexpr auto and_then(_Func&& __f) & {
using _Up = remove_cvref_t<invoke_result_t<_Func, _Tp&>>;
static_assert(__is_std_expected<_Up>::value, "The result of f(value()) must be a specialization of std::expected");
static_assert(is_same_v<typename _Up::error_type, _Err>,
"The result of f(value()) must have the same error_type as this expected");
if (has_value()) {
return std::invoke(std::forward<_Func>(__f), value());
}
return _Up(unexpect, error());
}
template <class _Func>
requires is_constructible_v<_Err, const _Err&>
_LIBCPP_HIDE_FROM_ABI constexpr auto and_then(_Func&& __f) const& {
using _Up = remove_cvref_t<invoke_result_t<_Func, const _Tp&>>;
static_assert(__is_std_expected<_Up>::value, "The result of f(value()) must be a specialization of std::expected");
static_assert(is_same_v<typename _Up::error_type, _Err>,
"The result of f(value()) must have the same error_type as this expected");
if (has_value()) {
return std::invoke(std::forward<_Func>(__f), value());
}
return _Up(unexpect, error());
}
template <class _Func>
requires is_constructible_v<_Err, _Err&&>
_LIBCPP_HIDE_FROM_ABI constexpr auto and_then(_Func&& __f) && {
using _Up = remove_cvref_t<invoke_result_t<_Func, _Tp&&>>;
static_assert(
__is_std_expected<_Up>::value, "The result of f(std::move(value())) must be a specialization of std::expected");
static_assert(is_same_v<typename _Up::error_type, _Err>,
"The result of f(std::move(value())) must have the same error_type as this expected");
if (has_value()) {
return std::invoke(std::forward<_Func>(__f), std::move(value()));
}
return _Up(unexpect, std::move(error()));
}
template <class _Func>
requires is_constructible_v<_Err, const _Err&&>
_LIBCPP_HIDE_FROM_ABI constexpr auto and_then(_Func&& __f) const&& {
using _Up = remove_cvref_t<invoke_result_t<_Func, const _Tp&&>>;
static_assert(
__is_std_expected<_Up>::value, "The result of f(std::move(value())) must be a specialization of std::expected");
static_assert(is_same_v<typename _Up::error_type, _Err>,
"The result of f(std::move(value())) must have the same error_type as this expected");
if (has_value()) {
return std::invoke(std::forward<_Func>(__f), std::move(value()));
}
return _Up(unexpect, std::move(error()));
}
template <class _Func>
requires is_constructible_v<_Tp, _Tp&>
_LIBCPP_HIDE_FROM_ABI constexpr auto or_else(_Func&& __f) & {
using _Gp = remove_cvref_t<invoke_result_t<_Func, _Err&>>;
static_assert(__is_std_expected<_Gp>::value, "The result of f(error()) must be a specialization of std::expected");
static_assert(is_same_v<typename _Gp::value_type, _Tp>,
"The result of f(error()) must have the same value_type as this expected");
if (has_value()) {
return _Gp(in_place, value());
}
return std::invoke(std::forward<_Func>(__f), error());
}
template <class _Func>
requires is_constructible_v<_Tp, const _Tp&>
_LIBCPP_HIDE_FROM_ABI constexpr auto or_else(_Func&& __f) const& {
using _Gp = remove_cvref_t<invoke_result_t<_Func, const _Err&>>;
static_assert(__is_std_expected<_Gp>::value, "The result of f(error()) must be a specialization of std::expected");
static_assert(is_same_v<typename _Gp::value_type, _Tp>,
"The result of f(error()) must have the same value_type as this expected");
if (has_value()) {
return _Gp(in_place, value());
}
return std::invoke(std::forward<_Func>(__f), error());
}
template <class _Func>
requires is_constructible_v<_Tp, _Tp&&>
_LIBCPP_HIDE_FROM_ABI constexpr auto or_else(_Func&& __f) && {
using _Gp = remove_cvref_t<invoke_result_t<_Func, _Err&&>>;
static_assert(
__is_std_expected<_Gp>::value, "The result of f(std::move(error())) must be a specialization of std::expected");
static_assert(is_same_v<typename _Gp::value_type, _Tp>,
"The result of f(std::move(error())) must have the same value_type as this expected");
if (has_value()) {
return _Gp(in_place, std::move(value()));
}
return std::invoke(std::forward<_Func>(__f), std::move(error()));
}
template <class _Func>
requires is_constructible_v<_Tp, const _Tp&&>
_LIBCPP_HIDE_FROM_ABI constexpr auto or_else(_Func&& __f) const&& {
using _Gp = remove_cvref_t<invoke_result_t<_Func, const _Err&&>>;
static_assert(
__is_std_expected<_Gp>::value, "The result of f(std::move(error())) must be a specialization of std::expected");
static_assert(is_same_v<typename _Gp::value_type, _Tp>,
"The result of f(std::move(error())) must have the same value_type as this expected");
if (has_value()) {
return _Gp(in_place, std::move(value()));
}
return std::invoke(std::forward<_Func>(__f), std::move(error()));
}
template <class _Func>
requires is_constructible_v<_Err, _Err&>
_LIBCPP_HIDE_FROM_ABI constexpr auto transform(_Func&& __f) & {
using _Up = remove_cv_t<invoke_result_t<_Func, _Tp&>>;
if (!has_value()) {
return expected<_Up, _Err>(unexpect, error());
}
if constexpr (!is_void_v<_Up>) {
return expected<_Up, _Err>(__expected_construct_in_place_from_invoke_tag{}, std::forward<_Func>(__f), value());
} else {
std::invoke(std::forward<_Func>(__f), value());
return expected<_Up, _Err>();
}
}
template <class _Func>
requires is_constructible_v<_Err, const _Err&>
_LIBCPP_HIDE_FROM_ABI constexpr auto transform(_Func&& __f) const& {
using _Up = remove_cv_t<invoke_result_t<_Func, const _Tp&>>;
if (!has_value()) {
return expected<_Up, _Err>(unexpect, error());
}
if constexpr (!is_void_v<_Up>) {
return expected<_Up, _Err>(__expected_construct_in_place_from_invoke_tag{}, std::forward<_Func>(__f), value());
} else {
std::invoke(std::forward<_Func>(__f), value());
return expected<_Up, _Err>();
}
}
template <class _Func>
requires is_constructible_v<_Err, _Err&&>
_LIBCPP_HIDE_FROM_ABI constexpr auto transform(_Func&& __f) && {
using _Up = remove_cv_t<invoke_result_t<_Func, _Tp&&>>;
if (!has_value()) {
return expected<_Up, _Err>(unexpect, std::move(error()));
}
if constexpr (!is_void_v<_Up>) {
return expected<_Up, _Err>(
__expected_construct_in_place_from_invoke_tag{}, std::forward<_Func>(__f), std::move(value()));
} else {
std::invoke(std::forward<_Func>(__f), std::move(value()));
return expected<_Up, _Err>();
}
}
template <class _Func>
requires is_constructible_v<_Err, const _Err&&>
_LIBCPP_HIDE_FROM_ABI constexpr auto transform(_Func&& __f) const&& {
using _Up = remove_cv_t<invoke_result_t<_Func, const _Tp&&>>;
if (!has_value()) {
return expected<_Up, _Err>(unexpect, std::move(error()));
}
if constexpr (!is_void_v<_Up>) {
return expected<_Up, _Err>(
__expected_construct_in_place_from_invoke_tag{}, std::forward<_Func>(__f), std::move(value()));
} else {
std::invoke(std::forward<_Func>(__f), std::move(value()));
return expected<_Up, _Err>();
}
}
template <class _Func>
requires is_constructible_v<_Tp, _Tp&>
_LIBCPP_HIDE_FROM_ABI constexpr auto transform_error(_Func&& __f) & {
using _Gp = remove_cv_t<invoke_result_t<_Func, _Err&>>;
static_assert(__valid_std_unexpected<_Gp>::value,
"The result of f(error()) must be a valid template argument for unexpected");
if (has_value()) {
return expected<_Tp, _Gp>(in_place, value());
}
return expected<_Tp, _Gp>(__expected_construct_unexpected_from_invoke_tag{}, std::forward<_Func>(__f), error());
}
template <class _Func>
requires is_constructible_v<_Tp, const _Tp&>
_LIBCPP_HIDE_FROM_ABI constexpr auto transform_error(_Func&& __f) const& {
using _Gp = remove_cv_t<invoke_result_t<_Func, const _Err&>>;
static_assert(__valid_std_unexpected<_Gp>::value,
"The result of f(error()) must be a valid template argument for unexpected");
if (has_value()) {
return expected<_Tp, _Gp>(in_place, value());
}
return expected<_Tp, _Gp>(__expected_construct_unexpected_from_invoke_tag{}, std::forward<_Func>(__f), error());
}
template <class _Func>
requires is_constructible_v<_Tp, _Tp&&>
_LIBCPP_HIDE_FROM_ABI constexpr auto transform_error(_Func&& __f) && {
using _Gp = remove_cv_t<invoke_result_t<_Func, _Err&&>>;
static_assert(__valid_std_unexpected<_Gp>::value,
"The result of f(std::move(error())) must be a valid template argument for unexpected");
if (has_value()) {
return expected<_Tp, _Gp>(in_place, std::move(value()));
}
return expected<_Tp, _Gp>(
__expected_construct_unexpected_from_invoke_tag{}, std::forward<_Func>(__f), std::move(error()));
}
template <class _Func>
requires is_constructible_v<_Tp, const _Tp&&>
_LIBCPP_HIDE_FROM_ABI constexpr auto transform_error(_Func&& __f) const&& {
using _Gp = remove_cv_t<invoke_result_t<_Func, const _Err&&>>;
static_assert(__valid_std_unexpected<_Gp>::value,
"The result of f(std::move(error())) must be a valid template argument for unexpected");
if (has_value()) {
return expected<_Tp, _Gp>(in_place, std::move(value()));
}
return expected<_Tp, _Gp>(
__expected_construct_unexpected_from_invoke_tag{}, std::forward<_Func>(__f), std::move(error()));
}
// [expected.object.eq], equality operators
template <class _T2, class _E2>
requires(!is_void_v<_T2>)
@ -625,24 +883,66 @@ public:
private:
struct __empty_t {};
// use named union because [[no_unique_address]] cannot be applied to an unnamed union
_LIBCPP_NO_UNIQUE_ADDRESS union __union_t {
_LIBCPP_HIDE_FROM_ABI constexpr __union_t() : __empty_() {}
template <class _ValueType, class _ErrorType>
union __union_t {
_LIBCPP_HIDE_FROM_ABI constexpr __union_t() {}
template <class _Func, class... _Args>
_LIBCPP_HIDE_FROM_ABI constexpr explicit __union_t(
std::__expected_construct_in_place_from_invoke_tag, _Func&& __f, _Args&&... __args)
: __val_(std::invoke(std::forward<_Func>(__f), std::forward<_Args>(__args)...)) {}
template <class _Func, class... _Args>
_LIBCPP_HIDE_FROM_ABI constexpr explicit __union_t(
std::__expected_construct_unexpected_from_invoke_tag, _Func&& __f, _Args&&... __args)
: __unex_(std::invoke(std::forward<_Func>(__f), std::forward<_Args>(__args)...)) {}
_LIBCPP_HIDE_FROM_ABI constexpr ~__union_t()
requires(is_trivially_destructible_v<_Tp> && is_trivially_destructible_v<_Err>)
requires(is_trivially_destructible_v<_ValueType> && is_trivially_destructible_v<_ErrorType>)
= default;
// the expected's destructor handles this
_LIBCPP_HIDE_FROM_ABI constexpr ~__union_t() {}
_ValueType __val_;
_ErrorType __unex_;
};
// use named union because [[no_unique_address]] cannot be applied to an unnamed union,
// also guaranteed elision into a potentially-overlapping subobject is unsettled (and
// it's not clear that it's implementable, given that the function is allowed to clobber
// the tail padding) - see https://github.com/itanium-cxx-abi/cxx-abi/issues/107.
template <class _ValueType, class _ErrorType>
requires(is_trivially_move_constructible_v<_ValueType> && is_trivially_move_constructible_v<_ErrorType>)
union __union_t<_ValueType, _ErrorType> {
_LIBCPP_HIDE_FROM_ABI constexpr __union_t() : __empty_() {}
template <class _Func, class... _Args>
_LIBCPP_HIDE_FROM_ABI constexpr explicit __union_t(
std::__expected_construct_in_place_from_invoke_tag, _Func&& __f, _Args&&... __args)
: __val_(std::invoke(std::forward<_Func>(__f), std::forward<_Args>(__args)...)) {}
template <class _Func, class... _Args>
_LIBCPP_HIDE_FROM_ABI constexpr explicit __union_t(
std::__expected_construct_unexpected_from_invoke_tag, _Func&& __f, _Args&&... __args)
: __unex_(std::invoke(std::forward<_Func>(__f), std::forward<_Args>(__args)...)) {}
_LIBCPP_HIDE_FROM_ABI constexpr ~__union_t()
requires(is_trivially_destructible_v<_ValueType> && is_trivially_destructible_v<_ErrorType>)
= default;
// the expected's destructor handles this
_LIBCPP_HIDE_FROM_ABI constexpr ~__union_t()
requires(!is_trivially_destructible_v<_Tp> || !is_trivially_destructible_v<_Err>)
requires(!is_trivially_destructible_v<_ValueType> || !is_trivially_destructible_v<_ErrorType>)
{}
_LIBCPP_NO_UNIQUE_ADDRESS __empty_t __empty_;
_LIBCPP_NO_UNIQUE_ADDRESS _Tp __val_;
_LIBCPP_NO_UNIQUE_ADDRESS _Err __unex_;
} __union_;
_LIBCPP_NO_UNIQUE_ADDRESS _ValueType __val_;
_LIBCPP_NO_UNIQUE_ADDRESS _ErrorType __unex_;
};
_LIBCPP_NO_UNIQUE_ADDRESS __union_t<_Tp, _Err> __union_;
bool __has_val_;
};
@ -762,6 +1062,19 @@ public:
std::construct_at(std::addressof(__union_.__unex_), __il, std::forward<_Args>(__args)...);
}
private:
template <class _Func>
_LIBCPP_HIDE_FROM_ABI constexpr explicit expected(__expected_construct_in_place_from_invoke_tag, _Func&& __f)
: __has_val_(true) {
std::invoke(std::forward<_Func>(__f));
}
template <class _Func, class... _Args>
_LIBCPP_HIDE_FROM_ABI constexpr explicit expected(
__expected_construct_unexpected_from_invoke_tag __tag, _Func&& __f, _Args&&... __args)
: __union_(__tag, std::forward<_Func>(__f), std::forward<_Args>(__args)...), __has_val_(false) {}
public:
// [expected.void.dtor], destructor
_LIBCPP_HIDE_FROM_ABI constexpr ~expected()
@ -899,13 +1212,13 @@ public:
_LIBCPP_HIDE_FROM_ABI constexpr void value() const& {
if (!__has_val_) {
__expected::__throw_bad_expected_access<_Err>(__union_.__unex_);
std::__throw_bad_expected_access<_Err>(__union_.__unex_);
}
}
_LIBCPP_HIDE_FROM_ABI constexpr void value() && {
if (!__has_val_) {
__expected::__throw_bad_expected_access<_Err>(std::move(__union_.__unex_));
std::__throw_bad_expected_access<_Err>(std::move(__union_.__unex_));
}
}
@ -929,6 +1242,235 @@ public:
return std::move(__union_.__unex_);
}
template <class _Up = _Err>
_LIBCPP_HIDE_FROM_ABI constexpr _Err error_or(_Up&& __error) const& {
static_assert(is_copy_constructible_v<_Err>, "error_type has to be copy constructible");
static_assert(is_convertible_v<_Up, _Err>, "argument has to be convertible to error_type");
if (has_value()) {
return std::forward<_Up>(__error);
}
return error();
}
template <class _Up = _Err>
_LIBCPP_HIDE_FROM_ABI constexpr _Err error_or(_Up&& __error) && {
static_assert(is_move_constructible_v<_Err>, "error_type has to be move constructible");
static_assert(is_convertible_v<_Up, _Err>, "argument has to be convertible to error_type");
if (has_value()) {
return std::forward<_Up>(__error);
}
return std::move(error());
}
// [expected.void.monadic], monadic
template <class _Func>
requires is_constructible_v<_Err, _Err&>
_LIBCPP_HIDE_FROM_ABI constexpr auto and_then(_Func&& __f) & {
using _Up = remove_cvref_t<invoke_result_t<_Func>>;
static_assert(__is_std_expected<_Up>::value, "The result of f() must be a specialization of std::expected");
static_assert(
is_same_v<typename _Up::error_type, _Err>, "The result of f() must have the same error_type as this expected");
if (has_value()) {
return std::invoke(std::forward<_Func>(__f));
}
return _Up(unexpect, error());
}
template <class _Func>
requires is_constructible_v<_Err, const _Err&>
_LIBCPP_HIDE_FROM_ABI constexpr auto and_then(_Func&& __f) const& {
using _Up = remove_cvref_t<invoke_result_t<_Func>>;
static_assert(__is_std_expected<_Up>::value, "The result of f() must be a specialization of std::expected");
static_assert(
is_same_v<typename _Up::error_type, _Err>, "The result of f() must have the same error_type as this expected");
if (has_value()) {
return std::invoke(std::forward<_Func>(__f));
}
return _Up(unexpect, error());
}
template <class _Func>
requires is_constructible_v<_Err, _Err&&>
_LIBCPP_HIDE_FROM_ABI constexpr auto and_then(_Func&& __f) && {
using _Up = remove_cvref_t<invoke_result_t<_Func>>;
static_assert(__is_std_expected<_Up>::value, "The result of f() must be a specialization of std::expected");
static_assert(
is_same_v<typename _Up::error_type, _Err>, "The result of f() must have the same error_type as this expected");
if (has_value()) {
return std::invoke(std::forward<_Func>(__f));
}
return _Up(unexpect, std::move(error()));
}
template <class _Func>
requires is_constructible_v<_Err, const _Err&&>
_LIBCPP_HIDE_FROM_ABI constexpr auto and_then(_Func&& __f) const&& {
using _Up = remove_cvref_t<invoke_result_t<_Func>>;
static_assert(__is_std_expected<_Up>::value, "The result of f() must be a specialization of std::expected");
static_assert(
is_same_v<typename _Up::error_type, _Err>, "The result of f() must have the same error_type as this expected");
if (has_value()) {
return std::invoke(std::forward<_Func>(__f));
}
return _Up(unexpect, std::move(error()));
}
template <class _Func>
_LIBCPP_HIDE_FROM_ABI constexpr auto or_else(_Func&& __f) & {
using _Gp = remove_cvref_t<invoke_result_t<_Func, _Err&>>;
static_assert(__is_std_expected<_Gp>::value, "The result of f(error()) must be a specialization of std::expected");
static_assert(is_same_v<typename _Gp::value_type, _Tp>,
"The result of f(error()) must have the same value_type as this expected");
if (has_value()) {
return _Gp();
}
return std::invoke(std::forward<_Func>(__f), error());
}
template <class _Func>
_LIBCPP_HIDE_FROM_ABI constexpr auto or_else(_Func&& __f) const& {
using _Gp = remove_cvref_t<invoke_result_t<_Func, const _Err&>>;
static_assert(__is_std_expected<_Gp>::value, "The result of f(error()) must be a specialization of std::expected");
static_assert(is_same_v<typename _Gp::value_type, _Tp>,
"The result of f(error()) must have the same value_type as this expected");
if (has_value()) {
return _Gp();
}
return std::invoke(std::forward<_Func>(__f), error());
}
template <class _Func>
_LIBCPP_HIDE_FROM_ABI constexpr auto or_else(_Func&& __f) && {
using _Gp = remove_cvref_t<invoke_result_t<_Func, _Err&&>>;
static_assert(__is_std_expected<_Gp>::value,
"The result of f(std::move(error())) must be a specialization of std::expected");
static_assert(is_same_v<typename _Gp::value_type, _Tp>,
"The result of f(std::move(error())) must have the same value_type as this expected");
if (has_value()) {
return _Gp();
}
return std::invoke(std::forward<_Func>(__f), std::move(error()));
}
template <class _Func>
_LIBCPP_HIDE_FROM_ABI constexpr auto or_else(_Func&& __f) const&& {
using _Gp = remove_cvref_t<invoke_result_t<_Func, const _Err&&>>;
static_assert(__is_std_expected<_Gp>::value,
"The result of f(std::move(error())) must be a specialization of std::expected");
static_assert(is_same_v<typename _Gp::value_type, _Tp>,
"The result of f(std::move(error())) must have the same value_type as this expected");
if (has_value()) {
return _Gp();
}
return std::invoke(std::forward<_Func>(__f), std::move(error()));
}
template <class _Func>
requires is_constructible_v<_Err, _Err&>
_LIBCPP_HIDE_FROM_ABI constexpr auto transform(_Func&& __f) & {
using _Up = remove_cv_t<invoke_result_t<_Func>>;
if (!has_value()) {
return expected<_Up, _Err>(unexpect, error());
}
if constexpr (!is_void_v<_Up>) {
return expected<_Up, _Err>(__expected_construct_in_place_from_invoke_tag{}, std::forward<_Func>(__f));
} else {
std::invoke(std::forward<_Func>(__f));
return expected<_Up, _Err>();
}
}
template <class _Func>
requires is_constructible_v<_Err, const _Err&>
_LIBCPP_HIDE_FROM_ABI constexpr auto transform(_Func&& __f) const& {
using _Up = remove_cv_t<invoke_result_t<_Func>>;
if (!has_value()) {
return expected<_Up, _Err>(unexpect, error());
}
if constexpr (!is_void_v<_Up>) {
return expected<_Up, _Err>(__expected_construct_in_place_from_invoke_tag{}, std::forward<_Func>(__f));
} else {
std::invoke(std::forward<_Func>(__f));
return expected<_Up, _Err>();
}
}
template <class _Func>
requires is_constructible_v<_Err, _Err&&>
_LIBCPP_HIDE_FROM_ABI constexpr auto transform(_Func&& __f) && {
using _Up = remove_cv_t<invoke_result_t<_Func>>;
if (!has_value()) {
return expected<_Up, _Err>(unexpect, std::move(error()));
}
if constexpr (!is_void_v<_Up>) {
return expected<_Up, _Err>(__expected_construct_in_place_from_invoke_tag{}, std::forward<_Func>(__f));
} else {
std::invoke(std::forward<_Func>(__f));
return expected<_Up, _Err>();
}
}
template <class _Func>
requires is_constructible_v<_Err, const _Err&&>
_LIBCPP_HIDE_FROM_ABI constexpr auto transform(_Func&& __f) const&& {
using _Up = remove_cv_t<invoke_result_t<_Func>>;
if (!has_value()) {
return expected<_Up, _Err>(unexpect, std::move(error()));
}
if constexpr (!is_void_v<_Up>) {
return expected<_Up, _Err>(__expected_construct_in_place_from_invoke_tag{}, std::forward<_Func>(__f));
} else {
std::invoke(std::forward<_Func>(__f));
return expected<_Up, _Err>();
}
}
template <class _Func>
_LIBCPP_HIDE_FROM_ABI constexpr auto transform_error(_Func&& __f) & {
using _Gp = remove_cv_t<invoke_result_t<_Func, _Err&>>;
static_assert(__valid_std_unexpected<_Gp>::value,
"The result of f(error()) must be a valid template argument for unexpected");
if (has_value()) {
return expected<_Tp, _Gp>();
}
return expected<_Tp, _Gp>(__expected_construct_unexpected_from_invoke_tag{}, std::forward<_Func>(__f), error());
}
template <class _Func>
_LIBCPP_HIDE_FROM_ABI constexpr auto transform_error(_Func&& __f) const& {
using _Gp = remove_cv_t<invoke_result_t<_Func, const _Err&>>;
static_assert(__valid_std_unexpected<_Gp>::value,
"The result of f(error()) must be a valid template argument for unexpected");
if (has_value()) {
return expected<_Tp, _Gp>();
}
return expected<_Tp, _Gp>(__expected_construct_unexpected_from_invoke_tag{}, std::forward<_Func>(__f), error());
}
template <class _Func>
_LIBCPP_HIDE_FROM_ABI constexpr auto transform_error(_Func&& __f) && {
using _Gp = remove_cv_t<invoke_result_t<_Func, _Err&&>>;
static_assert(__valid_std_unexpected<_Gp>::value,
"The result of f(std::move(error())) must be a valid template argument for unexpected");
if (has_value()) {
return expected<_Tp, _Gp>();
}
return expected<_Tp, _Gp>(
__expected_construct_unexpected_from_invoke_tag{}, std::forward<_Func>(__f), std::move(error()));
}
template <class _Func>
_LIBCPP_HIDE_FROM_ABI constexpr auto transform_error(_Func&& __f) const&& {
using _Gp = remove_cv_t<invoke_result_t<_Func, const _Err&&>>;
static_assert(__valid_std_unexpected<_Gp>::value,
"The result of f(std::move(error())) must be a valid template argument for unexpected");
if (has_value()) {
return expected<_Tp, _Gp>();
}
return expected<_Tp, _Gp>(
__expected_construct_unexpected_from_invoke_tag{}, std::forward<_Func>(__f), std::move(error()));
}
// [expected.void.eq], equality operators
template <class _T2, class _E2>
requires is_void_v<_T2>
@ -947,23 +1489,55 @@ public:
private:
struct __empty_t {};
// use named union because [[no_unique_address]] cannot be applied to an unnamed union
_LIBCPP_NO_UNIQUE_ADDRESS union __union_t {
template <class _ErrorType>
union __union_t {
_LIBCPP_HIDE_FROM_ABI constexpr __union_t() : __empty_() {}
template <class _Func, class... _Args>
_LIBCPP_HIDE_FROM_ABI constexpr explicit __union_t(
__expected_construct_unexpected_from_invoke_tag, _Func&& __f, _Args&&... __args)
: __unex_(std::invoke(std::forward<_Func>(__f), std::forward<_Args>(__args)...)) {}
_LIBCPP_HIDE_FROM_ABI constexpr ~__union_t()
requires(is_trivially_destructible_v<_Err>)
requires(is_trivially_destructible_v<_ErrorType>)
= default;
// the expected's destructor handles this
_LIBCPP_HIDE_FROM_ABI constexpr ~__union_t() {}
__empty_t __empty_;
_ErrorType __unex_;
};
// use named union because [[no_unique_address]] cannot be applied to an unnamed union,
// also guaranteed elision into a potentially-overlapping subobject is unsettled (and
// it's not clear that it's implementable, given that the function is allowed to clobber
// the tail padding) - see https://github.com/itanium-cxx-abi/cxx-abi/issues/107.
template <class _ErrorType>
requires is_trivially_move_constructible_v<_ErrorType>
union __union_t<_ErrorType> {
_LIBCPP_HIDE_FROM_ABI constexpr __union_t() : __empty_() {}
template <class _Func, class... _Args>
_LIBCPP_HIDE_FROM_ABI constexpr explicit __union_t(
__expected_construct_unexpected_from_invoke_tag, _Func&& __f, _Args&&... __args)
: __unex_(std::invoke(std::forward<_Func>(__f), std::forward<_Args>(__args)...)) {}
_LIBCPP_HIDE_FROM_ABI constexpr ~__union_t()
requires(is_trivially_destructible_v<_ErrorType>)
= default;
// the expected's destructor handles this
_LIBCPP_HIDE_FROM_ABI constexpr ~__union_t()
requires(!is_trivially_destructible_v<_Err>)
requires(!is_trivially_destructible_v<_ErrorType>)
{}
_LIBCPP_NO_UNIQUE_ADDRESS __empty_t __empty_;
_LIBCPP_NO_UNIQUE_ADDRESS _Err __unex_;
} __union_;
_LIBCPP_NO_UNIQUE_ADDRESS _ErrorType __unex_;
};
_LIBCPP_NO_UNIQUE_ADDRESS __union_t<_Err> __union_;
bool __has_val_;
};

4
libcxx/include/version
View File

@ -82,7 +82,7 @@ __cpp_lib_erase_if 202002L <deque> <forward
__cpp_lib_exchange_function 201304L <utility>
__cpp_lib_execution 201902L <execution>
201603L // C++17
__cpp_lib_expected 202202L <expected>
__cpp_lib_expected 202211L <expected>
__cpp_lib_filesystem 201703L <filesystem>
__cpp_lib_format 202106L <format>
__cpp_lib_format_ranges 202207L <format>
@ -399,7 +399,7 @@ __cpp_lib_void_t 201411L <type_traits>
# undef __cpp_lib_constexpr_memory
# define __cpp_lib_constexpr_memory 202202L
# define __cpp_lib_constexpr_typeinfo 202106L
# define __cpp_lib_expected 202202L
# define __cpp_lib_expected 202211L
# if !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)
# define __cpp_lib_format_ranges 202207L
# endif

126
libcxx/test/libcxx/utilities/expected/expected.expected/and_then.mandates.verify.cpp Normal file
View File

@ -0,0 +1,126 @@
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
// Test the mandates
// template<class F> constexpr auto and_then(F&& f) &;
// Mandates:
// Let U be std::remove_cvref_t<std::invoke_result<F, decltype(value())>>
// U is a specialization of std::expected and std::is_same_v<U:error_type, E> is true
// template<class F> constexpr auto and_then(F&& f) const &;
// Mandates:
// Let U be std::remove_cvref_t<std::invoke_result<F, decltype(value())>>
// U is a specialization of std::expected and std::is_same_v<U:error_type, E> is true
// template<class F> constexpr auto and_then(F&& f) &&;
// Mandates:
// Let U be std::remove_cvref_t<std::invoke_result<F, decltype(value())>>
// U is a specialization of std::expected and std::is_same_v<U:error_type, E> is true
// template<class F> constexpr auto and_then(F&& f) const &&;
// Mandates:
// Let U be std::remove_cvref_t<std::invoke_result<F, decltype(value())>>
// U is a specialization of std::expected and std::is_same_v<U:error_type, E> is true
#include <expected>
#include <utility>
struct NotSameAsInt {};
int lval_return_not_std_expected(int&) { return 0; }
int clval_return_not_std_expected(const int&) { return 0; }
int rval_return_not_std_expected(int&&) { return 0; }
int crval_return_not_std_expected(const int&&) { return 0; }
std::expected<int, NotSameAsInt> lval_error_type_not_same_as_int(int&) { return {}; }
std::expected<int, NotSameAsInt> clval_error_type_not_same_as_int(const int&) { return {}; }
std::expected<int, NotSameAsInt> rval_error_type_not_same_as_int(int&&) { return {}; }
std::expected<int, NotSameAsInt> crval_error_type_not_same_as_int(const int&&) { return {}; }
// clang-format off
void test() {
// Test & overload
{
// U is not a specialization of std::expected
{
std::expected<int, int> f1(1);
f1.and_then(lval_return_not_std_expected); // expected-note{{in instantiation of function template specialization 'std::expected<int, int>::and_then<int (&)(int &)>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f(value()) must be a specialization of std::expected}}
// expected-error-re@*:* {{{{.*}}cannot be used prior to '::' because it has no members}}
// expected-error-re@*:* {{no matching constructor for initialization of{{.*}}}}
}
// !std::is_same_v<U:error_type, E>
{
std::expected<int, int> f1(1);
f1.and_then(lval_error_type_not_same_as_int); // expected-note{{in instantiation of function template specialization 'std::expected<int, int>::and_then<std::expected<int, NotSameAsInt> (&)(int &)>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f(value()) must have the same error_type as this expected}}
}
}
// Test const& overload
{
// U is not a specialization of std::expected
{
const std::expected<int, int> f1(1);
f1.and_then(clval_return_not_std_expected); // expected-note{{in instantiation of function template specialization 'std::expected<int, int>::and_then<int (&)(const int &)>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f(value()) must be a specialization of std::expected}}
// expected-error-re@*:* {{{{.*}}cannot be used prior to '::' because it has no members}}
// expected-error-re@*:* {{no matching constructor for initialization of{{.*}}}}
}
// !std::is_same_v<U:error_type, E>
{
const std::expected<int, int> f1(1);
f1.and_then(clval_error_type_not_same_as_int); // expected-note{{in instantiation of function template specialization 'std::expected<int, int>::and_then<std::expected<int, NotSameAsInt> (&)(const int &)>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f(value()) must have the same error_type as this expected}}
}
}
// Test && overload
{
// U is not a specialization of std::expected
{
std::expected<int, int> f1(1);
std::move(f1).and_then(rval_return_not_std_expected); // expected-note{{in instantiation of function template specialization 'std::expected<int, int>::and_then<int (&)(int &&)>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f(std::move(value())) must be a specialization of std::expected}}
// expected-error-re@*:* {{{{.*}}cannot be used prior to '::' because it has no members}}
// expected-error-re@*:* {{no matching constructor for initialization of{{.*}}}}
}
// !std::is_same_v<U:error_type, E>
{
std::expected<int, int> f1(1);
std::move(f1).and_then(rval_error_type_not_same_as_int); // expected-note{{in instantiation of function template specialization 'std::expected<int, int>::and_then<std::expected<int, NotSameAsInt> (&)(int &&)>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f(std::move(value())) must have the same error_type as this expected}}
}
}
// Test const&& overload
{
// U is not a specialization of std::expected
{
const std::expected<int, int> f1(1);
std::move(f1).and_then(crval_return_not_std_expected); // expected-note{{in instantiation of function template specialization 'std::expected<int, int>::and_then<int (&)(const int &&)>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f(std::move(value())) must be a specialization of std::expected}}
// expected-error-re@*:* {{{{.*}}cannot be used prior to '::' because it has no members}}
// expected-error-re@*:* {{no matching constructor for initialization of{{.*}}}}
}
// !std::is_same_v<U:error_type, E>
{
const std::expected<int, int> f1(1);
std::move(f1).and_then(crval_error_type_not_same_as_int); // expected-note{{in instantiation of function template specialization 'std::expected<int, int>::and_then<std::expected<int, NotSameAsInt> (&)(const int &&)>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f(std::move(value())) must have the same error_type as this expected}}
}
}
}
// clang-format on

72
libcxx/test/libcxx/utilities/expected/expected.expected/error_or.mandates.verify.cpp Normal file
View File

@ -0,0 +1,72 @@
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
// Test the mandates
// template<class G = E> constexpr E error_or(G&&) const &;
// Mandates: is_copy_constructible_v<G> is true and is_convertible_v<U, E> is true.
// template<class G = E> constexpr E error_or(G&&) &&;
// Mandates: is_move_constructible_v<G> is true and is_convertible_v<U, E> is true.
#include <expected>
#include <utility>
struct NonCopyable {
NonCopyable(int) {}
NonCopyable(const NonCopyable&) = delete;
};
struct NonMovable {
NonMovable(int) {}
NonMovable(NonMovable&&) = delete;
};
struct NotConvertibleFromInt {};
// clang-format off
void test() {
// const & overload
// !is_copy_constructible_v<G>,
{
const std::expected<int, NonCopyable> f1(std::unexpect, 0);
f1.error_or(5); // expected-note{{in instantiation of function template specialization 'std::expected<int, NonCopyable>::error_or<int>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}error_type has to be copy constructible}}
// expected-error-re@*:* {{call to deleted constructor of{{.*}}}}
}
// const & overload
// !is_convertible_v<U, T>
{
const std::expected<int, NotConvertibleFromInt> f1(std::unexpect, NotConvertibleFromInt{});
f1.error_or(5); // expected-note{{in instantiation of function template specialization 'std::expected<int, NotConvertibleFromInt>::error_or<int>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}argument has to be convertible to error_type}}
// expected-error-re@*:* {{no viable conversion from returned value of type{{.*}}}}
}
// && overload
// !is_move_constructible_v<T>,
{
std::expected<int, NonMovable> f1(std::unexpect, 0);
std::move(f1).error_or(5); // expected-note{{in instantiation of function template specialization 'std::expected<int, NonMovable>::error_or<int>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}error_type has to be move constructible}}
// expected-error-re@*:* {{call to deleted constructor of{{.*}}}}
}
// && overload
// !is_convertible_v<U, T>
{
std::expected<int, NotConvertibleFromInt> f1(std::unexpect, NotConvertibleFromInt{});
std::move(f1).error_or(5); // expected-note{{in instantiation of function template specialization 'std::expected<int, NotConvertibleFromInt>::error_or<int>' requested here}}
//expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}argument has to be convertible to error_type}}
// expected-error-re@*:* {{no viable conversion from returned value of type{{.*}}}}
}
}
// clang-format on

16
libcxx/test/libcxx/utilities/expected/expected.expected/no_unique_address.compile.pass.cpp
View File

@ -16,4 +16,20 @@
struct Empty {};
struct A {
int x_;
int y_;
};
struct B : public A {
int z_;
virtual ~B() = default;
};
static_assert(sizeof(std::expected<Empty, Empty>) == sizeof(bool));
static_assert(sizeof(std::expected<Empty, A>) == 2 * sizeof(int) + alignof(std::expected<Empty, A>));
static_assert(sizeof(std::expected<Empty, B>) == sizeof(B) + alignof(std::expected<Empty, B>));
static_assert(sizeof(std::expected<A, Empty>) == 2 * sizeof(int) + alignof(std::expected<A, Empty>));
static_assert(sizeof(std::expected<A, A>) == 2 * sizeof(int) + alignof(std::expected<A, A>));
static_assert(sizeof(std::expected<B, Empty>) == sizeof(B) + alignof(std::expected<B, Empty>));
static_assert(sizeof(std::expected<B, B>) == sizeof(B) + alignof(std::expected<B, B>));

125
libcxx/test/libcxx/utilities/expected/expected.expected/or_else.mandates.verify.cpp Normal file
View File

@ -0,0 +1,125 @@
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
// Test the mandates
// template<class F> constexpr auto or_else(F&& f) &;
// Mandates:
// Let G be std::remove_cvref_t<std::invoke_result<F, decltype(error())>>
// G is a specialization of std::expected and std::is_same_v<G:value_type, T> is true
// template<class F> constexpr auto or_else(F&& f) const &;
// Mandates:
// Let G be std::remove_cvref_t<std::invoke_result<F, decltype(error())>>
// G is a specialization of std::expected and std::is_same_v<G:value_type, T> is true
// template<class F> constexpr auto or_else(F&& f) &&;
// Mandates:
// Let G be std::remove_cvref_t<std::invoke_result<F, decltype(error())>>
// G is a specialization of std::expected and std::is_same_v<G:value_type, T> is true
// template<class F> constexpr auto or_else(F&& f) const &&;
// Mandates:
// Let G be std::remove_cvref_t<std::invoke_result<F, decltype(error())>>
// G is a specialization of std::expected and std::is_same_v<G:value_type, T> is true
#include <expected>
#include <utility>
struct NotSameAsInt {};
int lval_return_not_std_expected(int&) { return 0; }
int clval_return_not_std_expected(const int&) { return 0; }
int rval_return_not_std_expected(int&&) { return 0; }
int crval_return_not_std_expected(const int&&) { return 0; }
std::expected<NotSameAsInt, int> lval_error_type_not_same_as_int(int&) { return {}; }
std::expected<NotSameAsInt, int> clval_error_type_not_same_as_int(const int&) { return {}; }
std::expected<NotSameAsInt, int> rval_error_type_not_same_as_int(int&&) { return {}; }
std::expected<NotSameAsInt, int> crval_error_type_not_same_as_int(const int&&) { return {}; }
// clang-format off
void test() {
// Test & overload
{
// G is not a specialization of std::expected
{
std::expected<int, int> f1(std::unexpected<int>(1));
f1.or_else(lval_return_not_std_expected); // expected-note{{in instantiation of function template specialization 'std::expected<int, int>::or_else<int (&)(int &)>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f(error()) must be a specialization of std::expected}}
// expected-error-re@*:* {{{{.*}}cannot be used prior to '::' because it has no members}}
// expected-error-re@*:* {{no matching constructor for initialization of{{.*}}}}
}
// !std::is_same_v<G:value_type, T>
{
std::expected<int, int> f1(std::unexpected<int>(1));
f1.or_else(lval_error_type_not_same_as_int); // expected-note{{in instantiation of function template specialization 'std::expected<int, int>::or_else<std::expected<NotSameAsInt, int> (&)(int &)>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f(error()) must have the same value_type as this expected}}
}
}
// Test const& overload
{
// G is not a specialization of std::expected
{
const std::expected<int, int> f1(std::unexpected<int>(1));
f1.or_else(clval_return_not_std_expected); // expected-note{{in instantiation of function template specialization 'std::expected<int, int>::or_else<int (&)(const int &)>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f(error()) must be a specialization of std::expected}}
// expected-error-re@*:* {{{{.*}}cannot be used prior to '::' because it has no members}}
// expected-error-re@*:* {{no matching constructor for initialization of{{.*}}}}
}
// !std::is_same_v<G:value_type, T>
{
const std::expected<int, int> f1(std::unexpected<int>(1));
f1.or_else(clval_error_type_not_same_as_int); // expected-note{{in instantiation of function template specialization 'std::expected<int, int>::or_else<std::expected<NotSameAsInt, int> (&)(const int &)>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f(error()) must have the same value_type as this expected}}
}
}
// Test && overload
{
// G is not a specialization of std::expected
{
std::expected<int, int> f1(std::unexpected<int>(1));
std::move(f1).or_else(rval_return_not_std_expected); // expected-note{{in instantiation of function template specialization 'std::expected<int, int>::or_else<int (&)(int &&)>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f(std::move(error())) must be a specialization of std::expected}}
// expected-error-re@*:* {{{{.*}}cannot be used prior to '::' because it has no members}}
// expected-error-re@*:* {{no matching constructor for initialization of{{.*}}}}
}
// !std::is_same_v<G:value_type, T>
{
std::expected<int, int> f1(std::unexpected<int>(1));
std::move(f1).or_else(rval_error_type_not_same_as_int); // expected-note{{in instantiation of function template specialization 'std::expected<int, int>::or_else<std::expected<NotSameAsInt, int> (&)(int &&)>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f(std::move(error())) must have the same value_type as this expected}}
}
}
// Test const&& overload
{
// G is not a specialization of std::expected
{
const std::expected<int, int> f1(std::unexpected<int>(1));
std::move(f1).or_else(crval_return_not_std_expected); // expected-note{{in instantiation of function template specialization 'std::expected<int, int>::or_else<int (&)(const int &&)>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f(std::move(error())) must be a specialization of std::expected}}
// expected-error-re@*:* {{{{.*}}cannot be used prior to '::' because it has no members}}
// expected-error-re@*:* {{no matching constructor for initialization of{{.*}}}}
}
// !std::is_same_v<G:value_type, T>
{
const std::expected<int, int> f1(std::unexpected<int>(1));
std::move(f1).or_else(crval_error_type_not_same_as_int); // expected-note{{in instantiation of function template specialization 'std::expected<int, int>::or_else<std::expected<NotSameAsInt, int> (&)(const int &&)>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f(std::move(error())) must have the same value_type as this expected}}
}
}
}
// clang-format on

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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
// Test the mandates
// template<class F> constexpr auto transform_error(F&& f) &;
// template<class F> constexpr auto transform_error(F&& f) const &;
//
// Let G be remove_cv_t<invoke_result_t<F, decltype(error())>>
// G is a valid template argument for unexpected ([expected.un.general]) and the declaration
// G g(invoke(std::forward<F>(f), error())); is well-formed.
// template<class F> constexpr auto transform_error(F&& f) &&;
// template<class F> constexpr auto transform_error(F&& f) const &&;
//
// Let G be remove_cv_t<invoke_result_t<F, decltype(std::move(error()))>>.
// G is a valid template argument for unexpected ([expected.un.general]) and the declaration
// G g(invoke(std::forward<F>(f), std::move(error()))); is well-formed.
#include <expected>
#include <utility>
static int val;
template <class T>
std::unexpected<int> return_unexpected(T) {
return std::unexpected<int>(1);
}
template <class T>
int& return_no_object(T) {
return val;
}
// clang-format off
void test() {
// Test & overload
{
std::expected<int, int> e;
e.transform_error(return_unexpected<int&>); // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of {{.*}} must be a valid template argument for unexpected}}
// expected-error-re@*:* {{{{(excess elements in struct initializer|no matching constructor for initialization of)}}{{.*}}}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}[expected.object.general] A program that instantiates the definition of template expected<T, E> for {{.*}} is ill-formed.}}
e.transform_error(return_no_object<int&>); // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of {{.*}} must be a valid template argument for unexpected}}
// expected-error-re@*:* {{{{(excess elements in struct initializer|no matching constructor for initialization of)}}{{.*}}}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}[expected.object.general] A program that instantiates the definition of template expected<T, E> for {{.*}} is ill-formed.}}
}
// Test const& overload
{
const std::expected<int, int> e;
e.transform_error(return_unexpected<const int &>); // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of {{.*}} must be a valid template argument for unexpected}}
// expected-error-re@*:* 2 {{{{(excess elements in struct initializer|no matching constructor for initialization of)}}{{.*}}}}
e.transform_error(return_no_object<const int &>); // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of {{.*}} must be a valid template argument for unexpected}}
// expected-error-re@*:* 2 {{{{(excess elements in struct initializer|no matching constructor for initialization of)}}{{.*}}}}
}
// Test && overload
{
std::expected<int, int> e;
std::move(e).transform_error(return_unexpected<int&&>); // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of {{.*}} must be a valid template argument for unexpected}}
// expected-error-re@*:* 2 {{{{(excess elements in struct initializer|no matching constructor for initialization of)}}{{.*}}}}
std::move(e).transform_error(return_no_object<int&&>); // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of {{.*}} must be a valid template argument for unexpected}}
// expected-error-re@*:* 2 {{{{(excess elements in struct initializer|no matching constructor for initialization of)}}{{.*}}}}
}
// Test const&& overload
{
const std::expected<int, int> e;
std::move(e).transform_error(return_unexpected<const int&&>); // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of {{.*}} must be a valid template argument for unexpected}}
// expected-error-re@*:* 2 {{{{(excess elements in struct initializer|no matching constructor for initialization of)}}{{.*}}}}
std::move(e).transform_error(return_no_object<const int&&>); // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of {{.*}} must be a valid template argument for unexpected}}
// expected-error-re@*:* 2 {{{{(excess elements in struct initializer|no matching constructor for initialization of)}}{{.*}}}}
}
}
// clang-format on

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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
// Test the mandates
// template<class F> constexpr auto and_then(F&& f) &;
// Mandates:
// Let U be std::remove_cvref_t<std::invoke_result<F>>
// U is a specialization of std::expected and std::is_same_v<U:error_type, E> is true
// template<class F> constexpr auto and_then(F&& f) const &;
// Mandates:
// Let U be std::remove_cvref_t<std::invoke_result<F>>
// U is a specialization of std::expected and std::is_same_v<U:error_type, E> is true
// template<class F> constexpr auto and_then(F&& f) &&;
// Mandates:
// Let U be std::remove_cvref_t<std::invoke_result<F>>
// U is a specialization of std::expected and std::is_same_v<U:error_type, E> is true
// template<class F> constexpr auto and_then(F&& f) const &&;
// Mandates:
// Let U be std::remove_cvref_t<std::invoke_result<F>>
// U is a specialization of std::expected and std::is_same_v<U:error_type, E> is true
#include <expected>
#include <utility>
struct NotSameAsInt {};
int lval_return_not_std_expected(void) { return 0; }
int clval_return_not_std_expected(void) { return 0; }
int rval_return_not_std_expected(void) { return 0; }
int crval_return_not_std_expected(void) { return 0; }
std::expected<int, NotSameAsInt> lval_error_type_not_same_as_int(void) { return {}; }
std::expected<int, NotSameAsInt> clval_error_type_not_same_as_int(void) { return {}; }
std::expected<int, NotSameAsInt> rval_error_type_not_same_as_int(void) { return {}; }
std::expected<int, NotSameAsInt> crval_error_type_not_same_as_int(void) { return {}; }
// clang-format off
void test() {
// Test & overload
{
// U is not a specialization of std::expected
{
std::expected<void, int> f1;
f1.and_then(lval_return_not_std_expected); // expected-note{{in instantiation of function template specialization 'std::expected<void, int>::and_then<int (&)()>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f() must be a specialization of std::expected}}
// expected-error-re@*:* {{{{.*}}cannot be used prior to '::' because it has no members}}
// expected-error-re@*:* {{no matching constructor for initialization of{{.*}}}}
}
// !std::is_same_v<U:error_type, E>
{
std::expected<void, int> f1;
f1.and_then(lval_error_type_not_same_as_int); // expected-note{{in instantiation of function template specialization 'std::expected<void, int>::and_then<std::expected<int, NotSameAsInt> (&)()>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f() must have the same error_type as this expected}}
}
}
// Test const& overload
{
// U is not a specialization of std::expected
{
const std::expected<void, int> f1;
f1.and_then(clval_return_not_std_expected); // expected-note{{in instantiation of function template specialization 'std::expected<void, int>::and_then<int (&)()>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f() must be a specialization of std::expected}}
// expected-error-re@*:* {{{{.*}}cannot be used prior to '::' because it has no members}}
// expected-error-re@*:* {{no matching constructor for initialization of{{.*}}}}
}
// !std::is_same_v<U:error_type, E>
{
const std::expected<void, int> f1;
f1.and_then(clval_error_type_not_same_as_int); // expected-note{{in instantiation of function template specialization 'std::expected<void, int>::and_then<std::expected<int, NotSameAsInt> (&)()>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f() must have the same error_type as this expected}}
}
}
// Test && overload
{
// U is not a specialization of std::expected
{
std::expected<void, int> f1;
std::move(f1).and_then(rval_return_not_std_expected); // expected-note{{in instantiation of function template specialization 'std::expected<void, int>::and_then<int (&)()>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f() must be a specialization of std::expected}}
// expected-error-re@*:* {{{{.*}}cannot be used prior to '::' because it has no members}}
// expected-error-re@*:* {{no matching constructor for initialization of{{.*}}}}
}
// !std::is_same_v<U:error_type, E>
{
std::expected<void, int> f1;
std::move(f1).and_then(rval_error_type_not_same_as_int); // expected-note{{in instantiation of function template specialization 'std::expected<void, int>::and_then<std::expected<int, NotSameAsInt> (&)()>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f() must have the same error_type as this expected}}
}
}
// Test const&& overload
{
// U is not a specialization of std::expected
{
const std::expected<void, int> f1;
std::move(f1).and_then(crval_return_not_std_expected); // expected-note{{in instantiation of function template specialization 'std::expected<void, int>::and_then<int (&)()>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f() must be a specialization of std::expected}}
// expected-error-re@*:* {{{{.*}}cannot be used prior to '::' because it has no members}}
// expected-error-re@*:* {{no matching constructor for initialization of{{.*}}}}
}
// !std::is_same_v<U:error_type, E>
{
const std::expected<void, int> f1;
std::move(f1).and_then(crval_error_type_not_same_as_int); // expected-note{{in instantiation of function template specialization 'std::expected<void, int>::and_then<std::expected<int, NotSameAsInt> (&)()>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f() must have the same error_type as this expected}}
}
}
}
// clang-format on

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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
// Test the mandates
// template<class G = E> constexpr E error_or(G&&) const &;
// Mandates: is_copy_constructible_v<G> is true and is_convertible_v<U, E> is true.
// template<class G = E> constexpr E error_or(G&&) &&;
// Mandates: is_move_constructible_v<G> is true and is_convertible_v<U, E> is true.
#include <expected>
#include <utility>
struct NonCopyable {
NonCopyable(int) {}
NonCopyable(const NonCopyable&) = delete;
};
struct NonMovable {
NonMovable(int) {}
NonMovable(NonMovable&&) = delete;
};
struct NotConvertibleFromInt {};
// clang-format off
void test() {
// const & overload
// !is_copy_constructible_v<G>,
{
const std::expected<void, NonCopyable> f1(std::unexpect, 0);
f1.error_or(5); // expected-note{{in instantiation of function template specialization 'std::expected<void, NonCopyable>::error_or<int>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}error_type has to be copy constructible}}
// expected-error-re@*:* {{call to deleted constructor of{{.*}}}}
}
// const & overload
// !is_convertible_v<U, T>
{
const std::expected<void, NotConvertibleFromInt> f1(std::unexpect, NotConvertibleFromInt{});
f1.error_or(5); // expected-note{{in instantiation of function template specialization 'std::expected<void, NotConvertibleFromInt>::error_or<int>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}argument has to be convertible to error_type}}
// expected-error-re@*:* {{no viable conversion from returned value of type{{.*}}}}
}
// && overload
// !is_move_constructible_v<T>,
{
std::expected<void, NonMovable> f1(std::unexpect, 0);
std::move(f1).error_or(5); // expected-note{{in instantiation of function template specialization 'std::expected<void, NonMovable>::error_or<int>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}error_type has to be move constructible}}
// expected-error-re@*:* {{call to deleted constructor of{{.*}}}}
}
// && overload
// !is_convertible_v<U, T>
{
std::expected<void, NotConvertibleFromInt> f1(std::unexpect, NotConvertibleFromInt{});
std::move(f1).error_or(5); // expected-note{{in instantiation of function template specialization 'std::expected<void, NotConvertibleFromInt>::error_or<int>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}argument has to be convertible to error_type}}
// expected-error-re@*:* {{no viable conversion from returned value of type{{.*}}}}
}
}
// clang-format on

12
libcxx/test/libcxx/utilities/expected/expected.void/no_unique_address.compile.pass.cpp
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@ -16,4 +16,16 @@
struct Empty {};
struct A {
int x_;
int y_;
};
struct B : public A {
int z_;
virtual ~B() = default;
};
static_assert(sizeof(std::expected<void, Empty>) == sizeof(bool));
static_assert(sizeof(std::expected<void, A>) == 2 * sizeof(int) + alignof(std::expected<void, A>));
static_assert(sizeof(std::expected<void, B>) == sizeof(B) + alignof(std::expected<void, B>));

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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
// Test the mandates
// template<class F> constexpr auto or_else(F&& f) &;
// Mandates:
// Let G be std::remove_cvref_t<std::invoke_result<F, decltype(error())>>
// G is a specialization of std::expected and std::is_same_v<G:value_type, T> is true
// template<class F> constexpr auto or_else(F&& f) const &;
// Mandates:
// Let G be std::remove_cvref_t<std::invoke_result<F, decltype(error())>>
// G is a specialization of std::expected and std::is_same_v<G:value_type, T> is true
// template<class F> constexpr auto or_else(F&& f) &&;
// Mandates:
// Let G be std::remove_cvref_t<std::invoke_result<F, decltype(error())>>
// G is a specialization of std::expected and std::is_same_v<G:value_type, T> is true
// template<class F> constexpr auto or_else(F&& f) const &&;
// Mandates:
// Let G be std::remove_cvref_t<std::invoke_result<F, decltype(error())>>
// G is a specialization of std::expected and std::is_same_v<G:value_type, T> is true
#include <expected>
#include <utility>
struct NotSameAsInt {};
int lval_return_not_std_expected(int&) { return 0; }
int clval_return_not_std_expected(const int&) { return 0; }
int rval_return_not_std_expected(int&&) { return 0; }
int crval_return_not_std_expected(const int&&) { return 0; }
std::expected<NotSameAsInt, int> lval_error_type_not_same_as_int(int&) { return {}; }
std::expected<NotSameAsInt, int> clval_error_type_not_same_as_int(const int&) { return {}; }
std::expected<NotSameAsInt, int> rval_error_type_not_same_as_int(int&&) { return {}; }
std::expected<NotSameAsInt, int> crval_error_type_not_same_as_int(const int&&) { return {}; }
// clang-format off
void test() {
// Test & overload
{
// G is not a specialization of std::expected
{
std::expected<void, int> f1(std::unexpected<int>(1));
f1.or_else(lval_return_not_std_expected); // expected-note{{in instantiation of function template specialization 'std::expected<void, int>::or_else<int (&)(int &)>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f(error()) must be a specialization of std::expected}}
// expected-error-re@*:* {{{{.*}}cannot be used prior to '::' because it has no members}}
}
// !std::is_same_v<G:value_type, T>
{
std::expected<void, int> f1(std::unexpected<int>(1));
f1.or_else(lval_error_type_not_same_as_int); // expected-note{{in instantiation of function template specialization 'std::expected<void, int>::or_else<std::expected<NotSameAsInt, int> (&)(int &)>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f(error()) must have the same value_type as this expected}}
}
}
// Test const& overload
{
// G is not a specialization of std::expected
{
const std::expected<void, int> f1(std::unexpected<int>(1));
f1.or_else(clval_return_not_std_expected); // expected-note{{in instantiation of function template specialization 'std::expected<void, int>::or_else<int (&)(const int &)>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f(error()) must be a specialization of std::expected}}
// expected-error-re@*:* {{{{.*}}cannot be used prior to '::' because it has no members}}
}
// !std::is_same_v<G:value_type, T>
{
const std::expected<void, int> f1(std::unexpected<int>(1));
f1.or_else(clval_error_type_not_same_as_int); // expected-note{{in instantiation of function template specialization 'std::expected<void, int>::or_else<std::expected<NotSameAsInt, int> (&)(const int &)>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f(error()) must have the same value_type as this expected}}
}
}
// Test && overload
{
// G is not a specialization of std::expected
{
std::expected<void, int> f1(std::unexpected<int>(1));
std::move(f1).or_else(rval_return_not_std_expected); // expected-note{{in instantiation of function template specialization 'std::expected<void, int>::or_else<int (&)(int &&)>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f(std::move(error())) must be a specialization of std::expected}}
// expected-error-re@*:* {{{{.*}}cannot be used prior to '::' because it has no members}}
}
// !std::is_same_v<G:value_type, T>
{
std::expected<void, int> f1(std::unexpected<int>(1));
std::move(f1).or_else(rval_error_type_not_same_as_int); // expected-note{{in instantiation of function template specialization 'std::expected<void, int>::or_else<std::expected<NotSameAsInt, int> (&)(int &&)>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f(std::move(error())) must have the same value_type as this expected}}
}
}
// Test const&& overload
{
// G is not a specialization of std::expected
{
const std::expected<void, int> f1(std::unexpected<int>(1));
std::move(f1).or_else(crval_return_not_std_expected); // expected-note{{in instantiation of function template specialization 'std::expected<void, int>::or_else<int (&)(const int &&)>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f(std::move(error())) must be a specialization of std::expected}}
// expected-error-re@*:* {{{{.*}}cannot be used prior to '::' because it has no members}}
}
// !std::is_same_v<G:value_type, T>
{
const std::expected<void, int> f1(std::unexpected<int>(1));
std::move(f1).or_else(crval_error_type_not_same_as_int); // expected-note{{in instantiation of function template specialization 'std::expected<void, int>::or_else<std::expected<NotSameAsInt, int> (&)(const int &&)>' requested here}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of f(std::move(error())) must have the same value_type as this expected}}
}
}
}
// clang-format on

84
libcxx/test/libcxx/utilities/expected/expected.void/transform_error.mandates.verify.cpp Normal file
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@ -0,0 +1,84 @@
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
// Test the mandates
// template<class F> constexpr auto transform_error(F&& f) &;
// template<class F> constexpr auto transform_error(F&& f) const &;
//
// Let G be remove_cv_t<invoke_result_t<F, decltype(error())>>
// G is a valid template argument for unexpected ([expected.un.general]) and the declaration
// G g(invoke(std::forward<F>(f), error())); is well-formed.
// template<class F> constexpr auto transform_error(F&& f) &&;
// template<class F> constexpr auto transform_error(F&& f) const &&;
//
// Let G be remove_cv_t<invoke_result_t<F, decltype(std::move(error()))>>.
// G is a valid template argument for unexpected ([expected.un.general]) and the declaration
// G g(invoke(std::forward<F>(f), std::move(error()))); is well-formed.
#include <expected>
#include <utility>
static int val;
template <class T>
std::unexpected<int> return_unexpected(T) {
return std::unexpected<int>(1);
}
template <class T>
int& return_no_object(T) {
return val;
}
// clang-format off
void test() {
// Test & overload
{
std::expected<void, int> e;
e.transform_error(return_unexpected<int&>); // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of {{.*}} must be a valid template argument for unexpected}}
// expected-error-re@*:* {{{{(excess elements in struct initializer|no matching constructor for initialization of)}}{{.*}}}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}A program that instantiates expected<T, E> with a E that is not a valid argument for unexpected<E> is ill-formed}}
e.transform_error(return_no_object<int&>); // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of {{.*}} must be a valid template argument for unexpected}}
// expected-error-re@*:* {{{{(excess elements in struct initializer|no matching constructor for initialization of)}}{{.*}}}}
// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}A program that instantiates expected<T, E> with a E that is not a valid argument for unexpected<E> is ill-formed}}
}
// Test const& overload
{
const std::expected<void, int> e;
e.transform_error(return_unexpected<const int &>); // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of {{.*}} must be a valid template argument for unexpected}}
// expected-error-re@*:* {{{{(excess elements in struct initializer|no matching constructor for initialization of)}}{{.*}}}}
e.transform_error(return_no_object<const int &>); // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of {{.*}} must be a valid template argument for unexpected}}
// expected-error-re@*:* {{{{(excess elements in struct initializer|no matching constructor for initialization of)}}{{.*}}}}
}
// Test && overload
{
std::expected<void, int> e;
std::move(e).transform_error(return_unexpected<int&&>); // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of {{.*}} must be a valid template argument for unexpected}}
// expected-error-re@*:* {{{{(excess elements in struct initializer|no matching constructor for initialization of)}}{{.*}}}}
std::move(e).transform_error(return_no_object<int&&>); // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of {{.*}} must be a valid template argument for unexpected}}
// expected-error-re@*:* {{{{(excess elements in struct initializer|no matching constructor for initialization of)}}{{.*}}}}
}
// Test const&& overload
{
const std::expected<void, int> e;
std::move(e).transform_error(return_unexpected<const int&&>); // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of {{.*}} must be a valid template argument for unexpected}}
// expected-error-re@*:* {{{{(excess elements in struct initializer|no matching constructor for initialization of)}}{{.*}}}}
std::move(e).transform_error(return_no_object<const int&&>); // expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}The result of {{.*}} must be a valid template argument for unexpected}}
// expected-error-re@*:* {{{{(excess elements in struct initializer|no matching constructor for initialization of)}}{{.*}}}}
}
}
// clang-format on

6
libcxx/test/std/language.support/support.limits/support.limits.general/expected.version.compile.pass.cpp
View File

@ -16,7 +16,7 @@
// Test the feature test macros defined by <expected>
/* Constant Value
__cpp_lib_expected 202202L [C++2b]
__cpp_lib_expected 202211L [C++2b]
*/
#include <expected>
@ -51,8 +51,8 @@
# ifndef __cpp_lib_expected
# error "__cpp_lib_expected should be defined in c++2b"
# endif
# if __cpp_lib_expected != 202202L
# error "__cpp_lib_expected should have the value 202202L in c++2b"
# if __cpp_lib_expected != 202211L
# error "__cpp_lib_expected should have the value 202211L in c++2b"
# endif
#endif // TEST_STD_VER > 20

6
libcxx/test/std/language.support/support.limits/support.limits.general/version.version.compile.pass.cpp
View File

@ -76,7 +76,7 @@
__cpp_lib_exchange_function 201304L [C++14]
__cpp_lib_execution 201603L [C++17]
201902L [C++20]
__cpp_lib_expected 202202L [C++2b]
__cpp_lib_expected 202211L [C++2b]
__cpp_lib_filesystem 201703L [C++17]
__cpp_lib_format 202106L [C++20]
__cpp_lib_format_ranges 202207L [C++2b]
@ -4161,8 +4161,8 @@
# ifndef __cpp_lib_expected
# error "__cpp_lib_expected should be defined in c++2b"
# endif
# if __cpp_lib_expected != 202202L
# error "__cpp_lib_expected should have the value 202202L in c++2b"
# if __cpp_lib_expected != 202211L
# error "__cpp_lib_expected should have the value 202211L in c++2b"
# endif
# if !defined(_LIBCPP_AVAILABILITY_HAS_NO_FILESYSTEM)

288
libcxx/test/std/utilities/expected/expected.expected/monadic/and_then.pass.cpp Normal file
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@ -0,0 +1,288 @@
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
// <expected>
// template<class F> constexpr auto and_then(F&& f) &;
// template<class F> constexpr auto and_then(F&& f) const &;
// template<class F> constexpr auto and_then(F&& f) &&;
// template<class F> constexpr auto and_then(F&& f) const &&;
#include <cassert>
#include <concepts>
#include <expected>
#include <memory>
#include <type_traits>
#include <utility>
struct LVal {
constexpr std::expected<int, int> operator()(int&) { return 1; }
std::expected<int, int> operator()(const int&) = delete;
std::expected<int, int> operator()(int&&) = delete;
std::expected<int, int> operator()(const int&&) = delete;
};
struct CLVal {
std::expected<int, int> operator()(int&) = delete;
constexpr std::expected<int, int> operator()(const int&) { return 1; }
std::expected<int, int> operator()(int&&) = delete;
std::expected<int, int> operator()(const int&&) = delete;
};
struct RVal {
std::expected<int, int> operator()(int&) = delete;
std::expected<int, int> operator()(const int&) = delete;
constexpr std::expected<int, int> operator()(int&&) { return 1; }
std::expected<int, int> operator()(const int&&) = delete;
};
struct CRVal {
std::expected<int, int> operator()(int&) = delete;
std::expected<int, int> operator()(const int&) = delete;
std::expected<int, int> operator()(int&&) = delete;
constexpr std::expected<int, int> operator()(const int&&) { return 1; }
};
struct RefQual {
constexpr std::expected<int, int> operator()(int) & { return 1; }
std::expected<int, int> operator()(int) const& = delete;
std::expected<int, int> operator()(int) && = delete;
std::expected<int, int> operator()(int) const&& = delete;
};
struct CRefQual {
std::expected<int, int> operator()(int) & = delete;
constexpr std::expected<int, int> operator()(int) const& { return 1; }
std::expected<int, int> operator()(int) && = delete;
std::expected<int, int> operator()(int) const&& = delete;
};
struct RVRefQual {
std::expected<int, int> operator()(int) & = delete;
std::expected<int, int> operator()(int) const& = delete;
constexpr std::expected<int, int> operator()(int) && { return 1; }
std::expected<int, int> operator()(int) const&& = delete;
};
struct RVCRefQual {
std::expected<int, int> operator()(int) & = delete;
std::expected<int, int> operator()(int) const& = delete;
std::expected<int, int> operator()(int) && = delete;
constexpr std::expected<int, int> operator()(int) const&& { return 1; }
};
struct UnexpectedLVal {
constexpr std::expected<int, int> operator()(int&) { return std::expected<int, int>(std::unexpected<int>(5)); }
std::expected<int, int> operator()(const int&) = delete;
std::expected<int, int> operator()(int&&) = delete;
std::expected<int, int> operator()(const int&&) = delete;
};
struct UnexpectedCLVal {
std::expected<int, int> operator()(int&) = delete;
constexpr std::expected<int, int> operator()(const int&) { return std::expected<int, int>(std::unexpected<int>(5)); }
std::expected<int, int> operator()(int&&) = delete;
std::expected<int, int> operator()(const int&&) = delete;
};
struct UnexpectedRVal {
std::expected<int, int> operator()(int&) = delete;
std::expected<int, int> operator()(const int&) = delete;
constexpr std::expected<int, int> operator()(int&&) { return std::expected<int, int>(std::unexpected<int>(5)); }
std::expected<int, int> operator()(const int&&) = delete;
};
struct UnexpectedCRVal {
std::expected<int, int> operator()(int&) = delete;
std::expected<int, int> operator()(const int&) = delete;
std::expected<int, int> operator()(int&&) = delete;
constexpr std::expected<int, int> operator()(const int&&) { return std::expected<int, int>(std::unexpected<int>(5)); }
};
struct UnexpectedRefQual {
constexpr std::expected<int, int> operator()(int) & { return std::expected<int, int>(std::unexpected<int>(5)); }
std::expected<int, int> operator()(int) const& = delete;
std::expected<int, int> operator()(int) && = delete;
std::expected<int, int> operator()(int) const&& = delete;
};
struct UnexpectedCRefQual {
std::expected<int, int> operator()(int) & = delete;
constexpr std::expected<int, int> operator()(int) const& { return std::expected<int, int>(std::unexpected<int>(5)); }
std::expected<int, int> operator()(int) && = delete;
std::expected<int, int> operator()(int) const&& = delete;
};
struct UnexpectedRVRefQual {
std::expected<int, int> operator()(int) & = delete;
std::expected<int, int> operator()(int) const& = delete;
constexpr std::expected<int, int> operator()(int) && { return std::expected<int, int>(std::unexpected<int>(5)); }
std::expected<int, int> operator()(int) const&& = delete;
};
struct UnexpectedRVCRefQual {
std::expected<int, int> operator()(int) & = delete;
std::expected<int, int> operator()(int) const& = delete;
std::expected<int, int> operator()(int) && = delete;
constexpr std::expected<int, int> operator()(int) const&& { return std::expected<int, int>(std::unexpected<int>(5)); }
};
struct NonCopyable {
constexpr NonCopyable(int) {}
NonCopyable(const NonCopyable&) = delete;
};
struct NonMovable {
constexpr NonMovable(int) {}
NonMovable(NonMovable&&) = delete;
};
struct NonConst {
std::expected<int, int> non_const() { return 1; }
};
template <class E, class F>
concept has_and_then = requires(E&& e, F&& f) {
{std::forward<E>(e).and_then(std::forward<F>(f))};
};
static_assert( has_and_then<std::expected<int, int>&, std::expected<int, int>(int&)>);
static_assert(!has_and_then<std::expected<int, NonCopyable>&, std::expected<int, NonCopyable>(int&)>);
static_assert( has_and_then<const std::expected<int, int>&, std::expected<int, int>(const int&)>);
static_assert(!has_and_then<const std::expected<int, NonCopyable>&, std::expected<int, NonCopyable>(const int&)>);
static_assert( has_and_then<std::expected<int, int>&&, std::expected<int, int>(int)>);
static_assert(!has_and_then<std::expected<int, NonMovable>&&, std::expected<int, NonMovable>(int)>);
static_assert( has_and_then<const std::expected<int, int>&&, std::expected<int, int>(const int)>);
static_assert(!has_and_then<const std::expected<int, NonMovable>&&, std::expected<int, NonMovable>(const int)>);
// [LWG 3877] https://cplusplus.github.io/LWG/issue3877, check constraint failing but not compile error inside the function body.
static_assert(!has_and_then<const std::expected<int, std::unique_ptr<int>>&, int()>);
static_assert(!has_and_then<const std::expected<int, std::unique_ptr<int>>&&, int()>);
// clang-format off
constexpr void test_val_types() {
// Test & overload
{
// Without &qualifier on F'soperator()
{
std::expected<int, int> e{0};
std::same_as<std::expected<int, int>> decltype(auto) val = e.and_then(LVal{});
assert(val == 1);
assert(e.and_then(UnexpectedLVal{}).error() == 5);
}
// With & qualifier on F's operator()
{
std::expected<int, int> e{0};
RefQual l{};
std::same_as<std::expected<int, int>> decltype(auto) val = e.and_then(l);
assert(val == 1);
UnexpectedRefQual nl{};
assert(e.and_then(nl).error() == 5);
}
}
// Test const& overload
{
// Without & qualifier on F's operator()
{
const std::expected<int, int> e{0};
std::same_as<std::expected<int, int>> decltype(auto) val = e.and_then(CLVal{});
assert(val == 1);
assert(e.and_then(UnexpectedCLVal{}).error() == 5);
}
// With & qualifier on F's operator()
{
const std::expected<int, int> e{0};
const CRefQual l{};
std::same_as<std::expected<int, int>> decltype(auto) val = e.and_then(l);
assert(val == 1);
const UnexpectedCRefQual nl{};
assert(e.and_then(nl).error() == 5);
}
}
// Test && overload
{
// Without & qualifier on F's operator()
{
std::expected<int, int> e{0};
std::same_as<std::expected<int, int>> decltype(auto) val = std::move(e).and_then(RVal{});
assert(val == 1);
assert(std::move(e).and_then(UnexpectedRVal{}).error() == 5);
}
// With & qualifier on F's operator()
{
std::expected<int, int> e{0};
std::same_as<std::expected<int, int>> decltype(auto) val = std::move(e).and_then(RVRefQual{});
assert(val == 1);
assert(e.and_then(UnexpectedRVRefQual{}).error() == 5);
}
}
// Test const&& overload
{
// Without & qualifier on F's operator()
{
const std::expected<int, int> e{0};
std::same_as<std::expected<int, int>> decltype(auto) val = std::move(e).and_then(CRVal{});
assert(val == 1);
assert(std::move(e).and_then(UnexpectedCRVal{}).error() == 5);
}
// With & qualifier on F's operator()
{
const std::expected<int, int> e{0};
const RVCRefQual l{};
std::same_as<std::expected<int, int>> decltype(auto) val = std::move(e).and_then(std::move(l));
assert(val == 1);
const UnexpectedRVCRefQual nl{};
assert(std::move(e).and_then(std::move(nl)).error() == 5);
}
}
}
// clang-format on
// check that the lambda body is not instantiated during overload resolution
constexpr void test_sfinae() {
std::expected<NonConst, int> e(std::unexpected<int>(2));
auto l = [](auto&& x) { return x.non_const(); };
e.and_then(l);
std::move(e).and_then(l);
}
constexpr bool test() {
test_sfinae();
test_val_types();
std::expected<int, int> e(std::unexpected<int>(1));
const auto& ce = e;
const auto never_called = [](int) {
assert(false);
return std::expected<int, int>();
};
e.and_then(never_called);
std::move(e).and_then(never_called);
ce.and_then(never_called);
std::move(ce).and_then(never_called);
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}

202
libcxx/test/std/utilities/expected/expected.expected/monadic/or_else.pass.cpp Normal file
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@ -0,0 +1,202 @@
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
// <expected>
// template<class F> constexpr auto or_else(F&& f) &;
// template<class F> constexpr auto or_else(F&& f) const &;
// template<class F> constexpr auto or_else(F&& f) &&;
// template<class F> constexpr auto or_else(F&& f) const &&;
#include <cassert>
#include <concepts>
#include <expected>
#include <memory>
#include <type_traits>
#include <utility>
struct LVal {
constexpr std::expected<int, int> operator()(int&) { return 1; }
std::expected<int, int> operator()(const int&) = delete;
std::expected<int, int> operator()(int&&) = delete;
std::expected<int, int> operator()(const int&&) = delete;
};
struct CLVal {
std::expected<int, int> operator()(int&) = delete;
constexpr std::expected<int, int> operator()(const int&) { return 1; }
std::expected<int, int> operator()(int&&) = delete;
std::expected<int, int> operator()(const int&&) = delete;
};
struct RVal {
std::expected<int, int> operator()(int&) = delete;
std::expected<int, int> operator()(const int&) = delete;
constexpr std::expected<int, int> operator()(int&&) { return 1; }
std::expected<int, int> operator()(const int&&) = delete;
};
struct CRVal {
std::expected<int, int> operator()(int&) = delete;
std::expected<int, int> operator()(const int&) = delete;
std::expected<int, int> operator()(int&&) = delete;
constexpr std::expected<int, int> operator()(const int&&) { return 1; }
};
struct RefQual {
constexpr std::expected<int, int> operator()(int) & { return 1; }
std::expected<int, int> operator()(int) const& = delete;
std::expected<int, int> operator()(int) && = delete;
std::expected<int, int> operator()(int) const&& = delete;
};
struct CRefQual {
std::expected<int, int> operator()(int) & = delete;
constexpr std::expected<int, int> operator()(int) const& { return 1; }
std::expected<int, int> operator()(int) && = delete;
std::expected<int, int> operator()(int) const&& = delete;
};
struct RVRefQual {
std::expected<int, int> operator()(int) & = delete;
std::expected<int, int> operator()(int) const& = delete;
constexpr std::expected<int, int> operator()(int) && { return 1; }
std::expected<int, int> operator()(int) const&& = delete;
};
struct RVCRefQual {
std::expected<int, int> operator()(int) & = delete;
std::expected<int, int> operator()(int) const& = delete;
std::expected<int, int> operator()(int) && = delete;
constexpr std::expected<int, int> operator()(int) const&& { return 1; }
};
template <class E, class F>
concept has_or_else =
requires(E&& e, F&& f) {
{ std::forward<E>(e).or_else(std::forward<F>(f)) };
};
// [LWG 3877] https://cplusplus.github.io/LWG/issue3877, check constraint failing but not compile error inside the function body.
static_assert(!has_or_else<const std::expected<std::unique_ptr<int>, int>&, int()>);
static_assert(!has_or_else<const std::expected<std::unique_ptr<int>, int>&&, int()>);
// clang-format off
constexpr void test_val_types() {
// Test & overload
{
// Without & qualifier on F's operator()
{
std::expected<int, int> e(std::unexpected<int>(0));
std::same_as<std::expected<int, int>> decltype(auto) val = e.or_else(LVal{});
assert(val == 1);
}
// With & qualifier on F's operator
{
std::expected<int, int> e(std::unexpected<int>(0));
RefQual l{};
std::same_as<std::expected<int, int>> decltype(auto) val = e.or_else(l);
assert(val == 1);
}
}
// Test const& overload
{
// Without const& qualifier on F's operator()
{
const std::expected<int, int> e(std::unexpected<int>(0));
std::same_as<std::expected<int, int>> decltype(auto) val = e.or_else(CLVal{});
assert(val == 1);
}
// With const& qualifier on F's operator()
{
const std::expected<int, int> e(std::unexpected<int>(0));
const CRefQual l{};
std::same_as<std::expected<int, int>> decltype(auto) val = e.or_else(l);
assert(val == 1);
}
}
// Test && overload
{
// Without && qualifier on F's operator()
{
std::expected<int, int> e(std::unexpected<int>(0));
std::same_as<std::expected<int, int>> decltype(auto) val = std::move(e).or_else(RVal{});
assert(val == 1);
}
// With && qualifier on F's operator()
{
std::expected<int, int> e(std::unexpected<int>(0));
std::same_as<std::expected<int, int>> decltype(auto) val = std::move(e).or_else(RVRefQual{});
assert(val == 1);
}
}
// Test const&& overload
{
// Without const&& qualifier on F's operator()
{
const std::expected<int, int> e(std::unexpected<int>(0));
std::same_as<std::expected<int, int>> decltype(auto) val = std::move(e).or_else(CRVal{});
assert(val == 1);
}
// With const&& qualifier on F's operator()
{
const std::expected<int, int> e(std::unexpected<int>(0));
const RVCRefQual l{};
std::same_as<std::expected<int, int>> decltype(auto) val = std::move(e).or_else(std::move(l));
assert(val == 1);
}
}
}
// clang-format on
struct NonConst {
std::expected<int, int> non_const() { return std::expected<int, int>(std::unexpect, 1); }
};
// check that the lambda body is not instantiated during overload resolution
constexpr void test_sfinae() {
std::expected<int, NonConst> e{1};
auto l = [](auto&& x) { return x.non_const(); };
e.or_else(l);
std::move(e).or_else(l);
}
constexpr bool test() {
test_sfinae();
test_val_types();
std::expected<int, int> e(1);
const auto& ce = e;
const auto never_called = [](int) {
assert(false);
return std::expected<int, int>();
};
e.or_else(never_called);
std::move(e).or_else(never_called);
ce.or_else(never_called);
std::move(ce).or_else(never_called);
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}

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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
// GCC has a issue for `Guaranteed copy elision for potentially-overlapping non-static data members`,
// please refer to: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108333, but we have a workaround to
// avoid this issue.
// <expected>
// template<class F> constexpr auto transform(F&& f) &;
// template<class F> constexpr auto transform(F&& f) const &;
// template<class F> constexpr auto transform(F&& f) &&;
// template<class F> constexpr auto transform(F&& f) const &&;
#include <expected>
#include <concepts>
#include <cassert>
#include <memory>
#include <type_traits>
#include <utility>
struct LVal {
constexpr int operator()(int&) { return 1; }
int operator()(const int&) = delete;
int operator()(int&&) = delete;
int operator()(const int&&) = delete;
};
struct CLVal {
int operator()(int&) = delete;
constexpr int operator()(const int&) { return 1; }
int operator()(int&&) = delete;
int operator()(const int&&) = delete;
};
struct RVal {
int operator()(int&) = delete;
int operator()(const int&) = delete;
constexpr int operator()(int&&) { return 1; }
int operator()(const int&&) = delete;
};
struct CRVal {
int operator()(int&) = delete;
int operator()(const int&) = delete;
int operator()(int&&) = delete;
constexpr int operator()(const int&&) { return 1; }
};
struct RefQual {
constexpr int operator()(int) & { return 1; }
int operator()(int) const& = delete;
int operator()(int) && = delete;
int operator()(int) const&& = delete;
};
struct CRefQual {
int operator()(int) & = delete;
constexpr int operator()(int) const& { return 1; }
int operator()(int) && = delete;
int operator()(int) const&& = delete;
};
struct RVRefQual {
int operator()(int) & = delete;
int operator()(int) const& = delete;
constexpr int operator()(int) && { return 1; }
int operator()(int) const&& = delete;
};
struct RVCRefQual {
int operator()(int) & = delete;
int operator()(int) const& = delete;
int operator()(int) && = delete;
constexpr int operator()(int) const&& { return 1; }
};
struct NonCopy {
int value;
constexpr explicit NonCopy(int val) : value(val) {}
NonCopy(const NonCopy&) = delete;
};
struct NonConst {
int non_const() { return 1; }
};
template <class E, class F>
concept has_transform =
requires(E&& e, F&& f) {
{ std::forward<E>(e).transform(std::forward<F>(f)) };
};
// [LWG 3877] https://cplusplus.github.io/LWG/issue3877, check constraint failing but not compile error inside the function body.
static_assert(!has_transform<const std::expected<int, std::unique_ptr<int>>&, int()>);
static_assert(!has_transform<const std::expected<int, std::unique_ptr<int>>&&, int()>);
// clang-format off
constexpr void test_val_types() {
// Test & overload
{
// Without &qualifier on F'soperator()
{
std::expected<int, int> e(0);
std::same_as<std::expected<int, int>> decltype(auto) val = e.transform(LVal{});
assert(val == 1);
}
// With & qualifier on F's operator()
{
std::expected<int, int> e(0);
RefQual l{};
std::same_as<std::expected<int, int>> decltype(auto) val = e.transform(l);
assert(val == 1);
}
}
// Test const& overload
{
// Without & qualifier on F's operator()
{
const std::expected<int, int> e(0);
std::same_as<std::expected<int, int>> decltype(auto) val = e.transform(CLVal{});
assert(val == 1);
}
// With & qualifier on F's operator()
{
const std::expected<int, int> e(0);
const CRefQual l{};
std::same_as<std::expected<int, int>> decltype(auto) val = e.transform(l);
assert(val == 1);
}
}
// Test && overload
{
// Without & qualifier on F's operator()
{
std::expected<int, int> e(0);
std::same_as<std::expected<int, int>> decltype(auto) val = std::move(e).transform(RVal{});
assert(val == 1);
}
// With & qualifier on F's operator()
{
std::expected<int, int> e(0);
std::same_as<std::expected<int, int>> decltype(auto) val = std::move(e).transform(RVRefQual{});
assert(val == 1);
}
}
// Test const&& overload
{
// Without & qualifier on F's operator()
{
const std::expected<int, int> e(0);
std::same_as<std::expected<int, int>> decltype(auto) val = std::move(e).transform(CRVal{});
assert(val == 1);
}
// With & qualifier on F's operator()
{
const std::expected<int, int> e(0);
const RVCRefQual l{};
std::same_as<std::expected<int, int>> decltype(auto) val = e.transform(std::move(l));
assert(val == 1);
}
}
}
// clang-format on
constexpr void test_take_val_return_void() {
std::expected<int, int> e(1);
int val = 0;
e.transform([&val]<typename T>(T&&) -> void {
static_assert(std::is_same_v<T, int&>);
assert(val == 0);
val = 1;
});
assert(val == 1);
std::move(e).transform([&val]<typename T>(T&&) -> void {
static_assert(std::is_same_v<T, int>);
assert(val == 1);
val = 2;
});
const auto& ce = e;
assert(val == 2);
ce.transform([&val]<typename T>(T&&) -> void {
static_assert(std::is_same_v<T, const int&>);
assert(val == 2);
val = 3;
});
assert(val == 3);
std::move(ce).transform([&val]<typename T>(T&&) -> void {
static_assert(std::is_same_v<T, const int>);
assert(val == 3);
val = 4;
});
assert(val == 4);
}
// check val member is direct-non-list-initialized with invoke(std::forward<F>(f), value())
constexpr void test_direct_non_list_init() {
auto xform = [](int i) { return NonCopy(i); };
std::expected<int, int> e(2);
std::expected<NonCopy, int> n = e.transform(xform);
assert(n.value().value == 2);
}
// check that the lambda body is not instantiated during overload resolution
constexpr void test_sfinae() {
std::expected<NonConst, int> e(std::unexpected<int>(2));
auto l = [](auto&& x) { return x.non_const(); };
e.transform(l);
std::move(e).transform(l);
std::expected<int, int> e1(std::unexpected<int>(1));
const auto& ce1 = e1;
const auto never_called = [](int) {
assert(false);
return std::expected<int, int>();
};
e1.transform(never_called);
std::move(e1).transform(never_called);
ce1.and_then(never_called);
std::move(ce1).transform(never_called);
}
constexpr bool test() {
test_sfinae();
test_val_types();
test_direct_non_list_init();
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}

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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
// GCC has a issue for `Guaranteed copy elision for potentially-overlapping non-static data members`,
// please refer to: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108333, but we have a workaround to
// avoid this issue.
// <expected>
// template<class F> constexpr auto transform_error(F&& f) &;
// template<class F> constexpr auto transform_error(F&& f) const &;
// template<class F> constexpr auto transform_error(F&& f) &&;
// template<class F> constexpr auto transform_error(F&& f) const &&;
#include <expected>
#include <concepts>
#include <cassert>
#include <memory>
#include <type_traits>
#include <utility>
struct LVal {
constexpr int operator()(int&) { return 1; }
int operator()(const int&) = delete;
int operator()(int&&) = delete;
int operator()(const int&&) = delete;
};
struct CLVal {
int operator()(int&) = delete;
constexpr int operator()(const int&) { return 1; }
int operator()(int&&) = delete;
int operator()(const int&&) = delete;
};
struct RVal {
int operator()(int&) = delete;
int operator()(const int&) = delete;
constexpr int operator()(int&&) { return 1; }
int operator()(const int&&) = delete;
};
struct CRVal {
int operator()(int&) = delete;
int operator()(const int&) = delete;
int operator()(int&&) = delete;
constexpr int operator()(const int&&) { return 1; }
};
struct RefQual {
constexpr int operator()(int) & { return 1; }
int operator()(int) const& = delete;
int operator()(int) && = delete;
int operator()(int) const&& = delete;
};
struct CRefQual {
int operator()(int) & = delete;
constexpr int operator()(int) const& { return 1; }
int operator()(int) && = delete;
int operator()(int) const&& = delete;
};
struct RVRefQual {
int operator()(int) & = delete;
int operator()(int) const& = delete;
constexpr int operator()(int) && { return 1; }
int operator()(int) const&& = delete;
};
struct RVCRefQual {
int operator()(int) & = delete;
int operator()(int) const& = delete;
int operator()(int) && = delete;
constexpr int operator()(int) const&& { return 1; }
};
struct NonCopy {
int value;
constexpr explicit NonCopy(int val) : value(val) {}
NonCopy(const NonCopy&) = delete;
};
struct NonConst {
int non_const() { return 1; }
};
template <class E, class F>
concept has_transform_error =
requires(E&& e, F&& f) {
{ std::forward<E>(e).transform_error(std::forward<F>(f)) };
};
// [LWG 3877] https://cplusplus.github.io/LWG/issue3877, check constraint failing but not compile error inside the function body.
static_assert(!has_transform_error<const std::expected<std::unique_ptr<int>, int>&, int()>);
static_assert(!has_transform_error<const std::expected<std::unique_ptr<int>, int>&&, int()>);
// clang-format off
constexpr void test_val_types() {
// Test & overload
{
// Without & qualifier on F's operator()
{
std::expected<int, int> e(std::unexpected<int>(0));
std::same_as<std::expected<int, int>> decltype(auto) val = e.transform_error(LVal{});
assert(val.error() == 1);
}
// With & qualifier on F's operator()
{
std::expected<int, int> e(std::unexpected<int>(0));
RefQual l{};
std::same_as<std::expected<int, int>> decltype(auto) val = e.transform_error(l);
assert(val.error() == 1);
}
}
// Test const& overload
{
// Without const& qualifier on F's operator()
{
const std::expected<int, int> e(std::unexpected<int>(0));
std::same_as<std::expected<int, int>> decltype(auto) val = e.transform_error(CLVal{});
assert(val.error() == 1);
}
// With const& qualifier on F's operator()
{
const std::expected<int, int> e(std::unexpected<int>(0));
const CRefQual l{};
std::same_as<std::expected<int, int>> decltype(auto) val = e.transform_error(l);
assert(val.error() == 1);
}
}
// Test && overload
{
// Without && qualifier on F's operator()
{
std::expected<int, int> e(std::unexpected<int>(0));
std::same_as<std::expected<int, int>> decltype(auto) val = std::move(e).transform_error(RVal{});
assert(val.error() == 1);
}
// With && qualifier on F's operator()
{
std::expected<int, int> e(std::unexpected<int>(0));
std::same_as<std::expected<int, int>> decltype(auto) val = std::move(e).transform_error(RVRefQual{});
assert(val.error() == 1);
}
}
// Test const&& overload
{
// Without const&& qualifier on F's operator()
{
const std::expected<int, int> e(std::unexpected<int>(0));
std::same_as<std::expected<int, int>> decltype(auto) val = std::move(e).transform_error(CRVal{});
assert(val.error() == 1);
}
// With const&& qualifier on F's operator()
{
const std::expected<int, int> e(std::unexpected<int>(0));
const RVCRefQual l{};
std::same_as<std::expected<int, int>> decltype(auto) val = std::move(e).transform_error(std::move(l));
assert(val.error() == 1);
}
}
}
// clang-format on
// check unex member is direct-non-list-initialized with invoke(std::forward<F>(f), error())
constexpr void test_direct_non_list_init() {
auto xform = [](int i) { return NonCopy(i); };
std::expected<int, int> e(std::unexpected<int>(2));
std::expected<int, NonCopy> n = e.transform_error(xform);
assert(n.error().value == 2);
}
// check that the lambda body is not instantiated during overload resolution
constexpr void test_sfinae() {
std::expected<int, NonConst> e(2);
auto l = [](auto&& x) { return x.non_const(); };
e.transform_error(l);
std::move(e).transform_error(l);
std::expected<int, int> e1;
const auto& ce1 = e1;
const auto never_called = [](int) {
assert(false);
return 0;
};
e1.transform_error(never_called);
std::move(e1).transform_error(never_called);
ce1.transform_error(never_called);
std::move(ce1).transform_error(never_called);
}
constexpr bool test() {
test_sfinae();
test_val_types();
test_direct_non_list_init();
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}

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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
// template<class G = E> constexpr E error_or(G&& e) const &;
// template<class G = E> constexpr E error_or(G&& e) &&;
#include <cassert>
#include <concepts>
#include <expected>
#include <type_traits>
#include <utility>
struct ConstructFromInt {
int value;
constexpr ConstructFromInt(int v) : value(v) {}
};
constexpr bool test_default_template_arg() {
// const &, has_value()
{
const std::expected<int, ConstructFromInt> e(5);
std::same_as<ConstructFromInt> decltype(auto) x = e.error_or(10);
assert(x.value == 10);
}
// const &, !has_value()
{
const std::expected<int, ConstructFromInt> e(std::unexpect, 5);
std::same_as<ConstructFromInt> decltype(auto) x = e.error_or(10);
assert(x.value == 5);
}
// &&, has_value()
{
const std::expected<int, ConstructFromInt> e(5);
std::same_as<ConstructFromInt> decltype(auto) x = std::move(e).error_or(10);
assert(x.value == 10);
}
// &&, !has_value()
{
const std::expected<int, ConstructFromInt> e(std::unexpect, 5);
std::same_as<ConstructFromInt> decltype(auto) x = std::move(e).error_or(10);
assert(x.value == 5);
}
return true;
}
constexpr bool test() {
// const &, has_value()
{
const std::expected<int, int> e(5);
std::same_as<int> decltype(auto) x = e.error_or(10);
assert(x == 10);
}
// const &, !has_value()
{
const std::expected<int, int> e(std::unexpect, 5);
std::same_as<int> decltype(auto) x = e.error_or(10);
assert(x == 5);
}
// &&, has_value()
{
std::expected<int, int> e(5);
std::same_as<int> decltype(auto) x = std::move(e).error_or(10);
assert(x == 10);
}
// &&, !has_value()
{
std::expected<int, int> e(std::unexpect, 5);
std::same_as<int> decltype(auto) x = std::move(e).error_or(10);
assert(x == 5);
}
return true;
}
int main(int, char**) {
test();
static_assert(test());
test_default_template_arg();
static_assert(test_default_template_arg());
return 0;
}

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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
// <expected>
// template<class F> constexpr auto and_then(F&& f) &;
// template<class F> constexpr auto and_then(F&& f) const &;
// template<class F> constexpr auto and_then(F&& f) &&;
// template<class F> constexpr auto and_then(F&& f) const &&;
#include <expected>
#include <concepts>
#include <cassert>
#include <memory>
#include <type_traits>
#include <utility>
struct NonCopyable {
constexpr NonCopyable(int) {}
NonCopyable(const NonCopyable&) = delete;
};
struct NonMovable {
constexpr NonMovable(int) {}
NonMovable(NonMovable&&) = delete;
};
template <class E, class F>
concept has_and_then =
requires(E&& e, F&& f) {
{ std::forward<E>(e).and_then(std::forward<F>(f)) };
};
std::expected<void, int> return_int() { return {}; }
std::expected<void, NonCopyable> return_noncopyable() { return {}; }
std::expected<void, NonMovable> return_nonmovable() { return {}; }
static_assert(has_and_then<std::expected<void, int>&, decltype(return_int)>);
static_assert(!has_and_then<std::expected<void, NonCopyable>&, decltype(return_noncopyable)>);
static_assert(has_and_then<const std::expected<void, int>&, decltype(return_int)>);
static_assert(!has_and_then<const std::expected<void, NonCopyable>&, decltype(return_noncopyable)>);
static_assert(has_and_then<std::expected<void, int>&&, decltype(return_int)>);
static_assert(!has_and_then<std::expected<void, NonMovable>&&, decltype(return_nonmovable)>);
static_assert(has_and_then<const std::expected<void, int>&&, decltype(return_int)>);
static_assert(!has_and_then<const std::expected<void, NonMovable>&&, decltype(return_nonmovable)>);
// [LWG 3877] https://cplusplus.github.io/LWG/issue3877, check constraint failing but not compile error inside the function body.
static_assert(!has_and_then<const std::expected<int, std::unique_ptr<int>>&, int()>);
static_assert(!has_and_then<const std::expected<int, std::unique_ptr<int>>&&, int()>);
constexpr void test_val_types() {
// Test & overload
{
auto l = [] -> std::expected<int, int> { return 2; };
std::expected<void, int> v;
std::same_as<std::expected<int, int>> decltype(auto) val = v.and_then(l);
assert(val == 2);
}
// Test const& overload
{
auto l = [] -> std::expected<int, int> { return 2; };
const std::expected<void, int> v;
assert(v.and_then(l).value() == 2);
static_assert(std::is_same_v< decltype(v.and_then(l)), std::expected<int, int>>);
}
// Test && overload
{
auto l = [] -> std::expected<int, int> { return 2; };
std::expected<void, int> v;
std::same_as<std::expected<int, int>> decltype(auto) val = std::move(v).and_then(l);
assert(val == 2);
}
// Test const&& overload
{
auto l = [] -> std::expected<int, int> { return 2; };
const std::expected<void, int> v;
std::same_as<std::expected<int, int>> decltype(auto) val = std::move(v).and_then(l);
assert(val == 2);
}
}
constexpr void test_fail() {
// Test & overload
{
auto f = [] -> std::expected<int, int> {
assert(false);
return 0;
};
std::expected<void, int> v(std::unexpected<int>(2));
std::same_as<std::expected<int, int>> decltype(auto) val = v.and_then(f);
assert(val.error() == 2);
}
// Test const& overload
{
auto f = [] -> std::expected<int, int> {
assert(false);
return 0;
};
const std::expected<void, int> v(std::unexpected<int>(2));
std::same_as<std::expected<int, int>> decltype(auto) val = v.and_then(f);
assert(val.error() == 2);
}
// Test && overload
{
auto f = [] -> std::expected<int, int> {
assert(false);
return 0;
};
std::expected<void, int> v(std::unexpected<int>(2));
std::same_as<std::expected<int, int>> decltype(auto) val = std::move(v).and_then(f);
assert(val.error() == 2);
}
// Test const&& overload
{
auto f = [] -> std::expected<int, int> {
assert(false);
return 0;
};
const std::expected<void, int> v(std::unexpected<int>(2));
std::same_as<std::expected<int, int>> decltype(auto) val = std::move(v).and_then(f);
assert(val.error() == 2);
}
}
constexpr bool test() {
test_fail();
test_val_types();
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}

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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
// <expected>
// template<class F> constexpr auto or_else(F&& f) &;
// template<class F> constexpr auto or_else(F&& f) const &;
// template<class F> constexpr auto or_else(F&& f) &&;
// template<class F> constexpr auto or_else(F&& f) const &&;
#include <expected>
#include <concepts>
#include <cassert>
#include <type_traits>
#include <utility>
constexpr void test_val_types() {
// Test & overload
{
auto l = [](auto) -> std::expected<void, long> { return {}; };
std::expected<void, int> v(std::unexpected<int>(1));
std::same_as<std::expected<void, long>> decltype(auto) val = v.or_else(l);
assert(val.has_value());
}
// Test const& overload
{
auto l = [](auto) -> std::expected<void, long> { return {}; };
const std::expected<void, int> v(std::unexpected<int>(1));
std::same_as<std::expected<void, long>> decltype(auto) val = v.or_else(l);
assert(val.has_value());
}
// Test && overload
{
auto l = [](auto) -> std::expected<void, long> { return {}; };
std::expected<void, int> v(std::unexpected<int>(1));
std::same_as<std::expected<void, long>> decltype(auto) val = std::move(v).or_else(l);
assert(val.has_value());
}
// Test const&& overload
{
auto l = [](auto) -> std::expected<void, long> { return {}; };
const std::expected<void, int> v(std::unexpected<int>(1));
std::same_as<std::expected<void, long>> decltype(auto) val = std::move(v).or_else(l);
assert(val.has_value());
}
}
constexpr void test_fail() {
auto never_called = [](auto) -> std::expected<void, long> {
assert(false);
return std::expected<void, long>(std::unexpected<long>(5));
};
// Test & overload
{
std::expected<void, int> v;
std::same_as<std::expected<void, long>> decltype(auto) val = v.or_else(never_called);
assert(val.has_value());
}
// Test const& overload
{
const std::expected<void, int> v;
std::same_as<std::expected<void, long>> decltype(auto) val = v.or_else(never_called);
assert(val.has_value());
}
// Test && overload
{
std::expected<void, int> v;
std::same_as<std::expected<void, long>> decltype(auto) val = std::move(v).or_else(never_called);
assert(val.has_value());
}
// Test const&& overload
{
const std::expected<void, int> v;
std::same_as<std::expected<void, long>> decltype(auto) val = std::move(v).or_else(never_called);
assert(val.has_value());
}
}
constexpr bool test() {
test_fail();
test_val_types();
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}

126
libcxx/test/std/utilities/expected/expected.void/monadic/transform.pass.cpp Normal file
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@ -0,0 +1,126 @@
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
// <expected>
// template<class F> constexpr auto transform_error(F&& f) &;
// template<class F> constexpr auto transform_error(F&& f) const &;
// template<class F> constexpr auto transform_error(F&& f) &&;
// template<class F> constexpr auto transform_error(F&& f) const &&;
#include <expected>
#include <concepts>
#include <cassert>
#include <memory>
#include <type_traits>
#include <utility>
template <class E, class F>
concept has_transform =
requires(E&& e, F&& f) {
{ std::forward<E>(e).transform(std::forward<F>(f)) };
};
// [LWG 3877] https://cplusplus.github.io/LWG/issue3877, check constraint failing but not compile error inside the function body.
static_assert(!has_transform<const std::expected<int, std::unique_ptr<int>>&, int()>);
static_assert(!has_transform<const std::expected<int, std::unique_ptr<int>>&&, int()>);
constexpr void test_val_types() {
// Test & overload
{
auto l = [] -> int { return 1; };
std::expected<void, int> v;
std::same_as<std::expected<int, int>> decltype(auto) val = v.transform(l);
assert(val == 1);
}
// Test const& overload
{
auto l = [] -> int { return 1; };
const std::expected<void, int> v;
std::same_as<std::expected<int, int>> decltype(auto) val = v.transform(l);
assert(val == 1);
}
// Test && overload
{
auto l = [] -> int { return 1; };
std::expected<void, int> v;
std::same_as<std::expected<int, int>> decltype(auto) val = std::move(v).transform(l);
assert(val == 1);
}
// Test const&& overload
{
auto l = [] -> int { return 1; };
const std::expected<void, int> v;
std::same_as<std::expected<int, int>> decltype(auto) val = std::move(v).transform(l);
assert(val == 1);
}
}
constexpr void test_fail() {
// Test & overload
{
auto l = [] -> int {
assert(false);
return 0;
};
std::expected<void, int> v(std::unexpected<int>(5));
std::same_as<std::expected<int, int>> decltype(auto) val = v.transform(l);
assert(val.error() == 5);
}
// Test const& overload
{
auto l = [] -> int {
assert(false);
return 0;
};
const std::expected<void, int> v(std::unexpected<int>(5));
std::same_as<std::expected<int, int>> decltype(auto) val = v.transform(l);
assert(val.error() == 5);
}
// Test && overload
{
auto l = [] -> int {
assert(false);
return 0;
};
std::expected<void, int> v(std::unexpected<int>(5));
std::same_as<std::expected<int, int>> decltype(auto) val = std::move(v).transform(l);
assert(val.error() == 5);
}
// Test const&& overload
{
auto l = [] -> int {
assert(false);
return 0;
};
const std::expected<void, int> v(std::unexpected<int>(5));
std::same_as<std::expected<int, int>> decltype(auto) val = std::move(v).transform(l);
assert(val.error() == 5);
}
}
constexpr bool test() {
test_fail();
test_val_types();
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}

134
libcxx/test/std/utilities/expected/expected.void/monadic/transform_error.pass.cpp Normal file
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@ -0,0 +1,134 @@
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
// GCC has a issue for `Guaranteed copy elision for potentially-overlapping non-static data members`,
// please refer to: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108333, but we have a workaround to
// avoid this issue.
// <expected>
// template<class F> constexpr auto transform_error(F&& f) &;
// template<class F> constexpr auto transform_error(F&& f) const &;
// template<class F> constexpr auto transform_error(F&& f) &&;
// template<class F> constexpr auto transform_error(F&& f) const &&;
#include <expected>
#include <concepts>
#include <cassert>
#include <type_traits>
#include <utility>
struct NonCopy {
int value;
constexpr explicit NonCopy(int val) : value(val) {}
NonCopy(const NonCopy&) = delete;
};
constexpr void test_val_types() {
// Test & overload
{
auto l = [](auto) -> int { return 1; };
std::expected<void, int> v(std::unexpected<int>(2));
std::same_as<std::expected<void, int>> decltype(auto) val = v.transform_error(l);
assert(val.error() == 1);
}
// Test const& overload
{
auto l = [](auto) -> int { return 1; };
const std::expected<void, int> v(std::unexpected<int>(2));
std::same_as<std::expected<void, int>> decltype(auto) val = v.transform_error(l);
assert(val.error() == 1);
}
// Test && overload
{
auto l = [](auto) -> int { return 1; };
std::expected<void, int> v(std::unexpected<int>(2));
std::same_as<std::expected<void, int>> decltype(auto) val = std::move(v).transform_error(l);
assert(val.error() == 1);
}
// Test const&& overload
{
auto l = [](auto) -> int { return 1; };
const std::expected<void, int> v(std::unexpected<int>(2));
std::same_as<std::expected<void, int>> decltype(auto) val = std::move(v).transform_error(l);
assert(val.error() == 1);
}
}
constexpr void test_fail() {
// Test & overload
{
auto l = [](auto) -> int {
assert(false);
return 0;
};
std::expected<void, int> v;
std::same_as<std::expected<void, int>> decltype(auto) val = v.transform_error(l);
assert(val.has_value());
}
// Test const& overload
{
auto l = [](auto) -> int {
assert(false);
return 0;
};
const std::expected<void, int> v;
std::same_as<std::expected<void, int>> decltype(auto) val = v.transform_error(l);
assert(val.has_value());
}
// Test && overload
{
auto l = [](auto) -> int {
assert(false);
return 0;
};
std::expected<void, int> v;
std::same_as<std::expected<void, int>> decltype(auto) val = std::move(v).transform_error(l);
assert(val.has_value());
}
// Test const&& overload
{
auto l = [](auto) -> int {
assert(false);
return 0;
};
const std::expected<void, int> v;
std::same_as<std::expected<void, int>> decltype(auto) val = std::move(v).transform_error(l);
assert(val.has_value());
}
}
// check unex member is direct-non-list-initialized with invoke(std::forward<F>(f))
constexpr void test_direct_non_list_init() {
auto x = [](int i) { return NonCopy(i); };
std::expected<void, int> v(std::unexpected<int>(2));
std::expected<void, NonCopy> nv = v.transform_error(x);
assert(nv.error().value == 2);
}
constexpr bool test() {
test_fail();
test_val_types();
test_direct_non_list_init();
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}

96
libcxx/test/std/utilities/expected/expected.void/observers/error_or.pass.cpp Normal file
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@ -0,0 +1,96 @@
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
// template<class G = E> constexpr E error_or(G&& e) const &;
// template<class G = E> constexpr E error_or(G&& e) &&;
#include <cassert>
#include <concepts>
#include <expected>
#include <type_traits>
#include <utility>
struct ConstructFromInt {
int value;
constexpr ConstructFromInt(int v) : value(v) {}
};
constexpr bool test_default_template_arg() {
// const &, has_value()
{
const std::expected<void, ConstructFromInt> e;
std::same_as<ConstructFromInt> decltype(auto) x = e.error_or(10);
assert(x.value == 10);
}
// const &, !has_value()
{
const std::expected<void, ConstructFromInt> e(std::unexpect, 5);
std::same_as<ConstructFromInt> decltype(auto) x = e.error_or(10);
assert(x.value == 5);
}
// &&, has_value()
{
const std::expected<void, ConstructFromInt> e;
std::same_as<ConstructFromInt> decltype(auto) x = std::move(e).error_or(10);
assert(x.value == 10);
}
// &&, !has_value()
{
const std::expected<void, ConstructFromInt> e(std::unexpect, 5);
std::same_as<ConstructFromInt> decltype(auto) x = std::move(e).error_or(10);
assert(x.value == 5);
}
return true;
}
constexpr bool test() {
// const &, has_value()
{
const std::expected<void, int> e;
std::same_as<int> decltype(auto) x = e.error_or(10);
assert(x == 10);
}
// const &, !has_value()
{
const std::expected<void, int> e(std::unexpect, 5);
std::same_as<int> decltype(auto) x = e.error_or(10);
assert(x == 5);
}
// &&, has_value()
{
std::expected<void, int> e;
std::same_as<int> decltype(auto) x = std::move(e).error_or(10);
assert(x == 10);
}
// &&, !has_value()
{
std::expected<void, int> e(std::unexpect, 5);
std::same_as<int> decltype(auto) x = std::move(e).error_or(10);
assert(x == 5);
}
return true;
}
int main(int, char**) {
test();
static_assert(test());
test_default_template_arg();
static_assert(test_default_template_arg());
return 0;
}

2
libcxx/utils/generate_feature_test_macro_components.py
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@ -306,7 +306,7 @@ feature_test_macros = [ add_version_header(x) for x in [
"unimplemented": True,
}, {
"name": "__cpp_lib_expected",
"values": { "c++2b": 202202 },
"values": { "c++2b": 202211 },
"headers": ["expected"],
}, {
"name": "__cpp_lib_filesystem",