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llvm-capstone/libcxx/include/__functional_base
Christopher Di Bella c25c22d5f9 [libcxx] moves std::invoke into __functional_base 
Including `<concepts>` in other standard library headers (such as
`<iterator>`) creates circular dependencies due to `<functional>`.
Since `<concepts>` only needs `std::invoke` from `<functional>`, the
easiest, fastest, and cleanest way to eliminate the circular dep is to
move `std::invoke` into `__functional_base`.

This has the added advantage of `<concepts>` not transitively importing
`<functional>`.

Differential Revision: https://reviews.llvm.org/D99041
2021-04-06 01:25:15 +00:00

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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP_FUNCTIONAL_BASE
#define _LIBCPP_FUNCTIONAL_BASE
#include <__config>
#include <type_traits>
#include <typeinfo>
#include <exception>
#include <new>
#include <utility>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
template <class _Arg1, class _Arg2, class _Result>
struct _LIBCPP_TEMPLATE_VIS binary_function
{
typedef _Arg1 first_argument_type;
typedef _Arg2 second_argument_type;
typedef _Result result_type;
};
template <class _Tp>
struct __has_result_type
{
private:
struct __two {char __lx; char __lxx;};
template <class _Up> static __two __test(...);
template <class _Up> static char __test(typename _Up::result_type* = 0);
public:
static const bool value = sizeof(__test<_Tp>(0)) == 1;
};
#if _LIBCPP_STD_VER > 11
template <class _Tp = void>
#else
template <class _Tp>
#endif
struct _LIBCPP_TEMPLATE_VIS less : binary_function<_Tp, _Tp, bool>
{
_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
bool operator()(const _Tp& __x, const _Tp& __y) const
{return __x < __y;}
};
#if _LIBCPP_STD_VER > 11
template <>
struct _LIBCPP_TEMPLATE_VIS less<void>
{
template <class _T1, class _T2>
_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
auto operator()(_T1&& __t, _T2&& __u) const
_NOEXCEPT_(noexcept(_VSTD::forward<_T1>(__t) < _VSTD::forward<_T2>(__u)))
-> decltype (_VSTD::forward<_T1>(__t) < _VSTD::forward<_T2>(__u))
{ return _VSTD::forward<_T1>(__t) < _VSTD::forward<_T2>(__u); }
typedef void is_transparent;
};
#endif
// __weak_result_type
template <class _Tp>
struct __derives_from_unary_function
{
private:
struct __two {char __lx; char __lxx;};
static __two __test(...);
template <class _Ap, class _Rp>
static unary_function<_Ap, _Rp>
__test(const volatile unary_function<_Ap, _Rp>*);
public:
static const bool value = !is_same<decltype(__test((_Tp*)0)), __two>::value;
typedef decltype(__test((_Tp*)0)) type;
};
template <class _Tp>
struct __derives_from_binary_function
{
private:
struct __two {char __lx; char __lxx;};
static __two __test(...);
template <class _A1, class _A2, class _Rp>
static binary_function<_A1, _A2, _Rp>
__test(const volatile binary_function<_A1, _A2, _Rp>*);
public:
static const bool value = !is_same<decltype(__test((_Tp*)0)), __two>::value;
typedef decltype(__test((_Tp*)0)) type;
};
template <class _Tp, bool = __derives_from_unary_function<_Tp>::value>
struct __maybe_derive_from_unary_function // bool is true
: public __derives_from_unary_function<_Tp>::type
{
};
template <class _Tp>
struct __maybe_derive_from_unary_function<_Tp, false>
{
};
template <class _Tp, bool = __derives_from_binary_function<_Tp>::value>
struct __maybe_derive_from_binary_function // bool is true
: public __derives_from_binary_function<_Tp>::type
{
};
template <class _Tp>
struct __maybe_derive_from_binary_function<_Tp, false>
{
};
template <class _Tp, bool = __has_result_type<_Tp>::value>
struct __weak_result_type_imp // bool is true
: public __maybe_derive_from_unary_function<_Tp>,
public __maybe_derive_from_binary_function<_Tp>
{
typedef _LIBCPP_NODEBUG_TYPE typename _Tp::result_type result_type;
};
template <class _Tp>
struct __weak_result_type_imp<_Tp, false>
: public __maybe_derive_from_unary_function<_Tp>,
public __maybe_derive_from_binary_function<_Tp>
{
};
template <class _Tp>
struct __weak_result_type
: public __weak_result_type_imp<_Tp>
{
};
// 0 argument case
template <class _Rp>
struct __weak_result_type<_Rp ()>
{
typedef _LIBCPP_NODEBUG_TYPE _Rp result_type;
};
template <class _Rp>
struct __weak_result_type<_Rp (&)()>
{
typedef _LIBCPP_NODEBUG_TYPE _Rp result_type;
};
template <class _Rp>
struct __weak_result_type<_Rp (*)()>
{
typedef _LIBCPP_NODEBUG_TYPE _Rp result_type;
};
// 1 argument case
template <class _Rp, class _A1>
struct __weak_result_type<_Rp (_A1)>
: public unary_function<_A1, _Rp>
{
};
template <class _Rp, class _A1>
struct __weak_result_type<_Rp (&)(_A1)>
: public unary_function<_A1, _Rp>
{
};
template <class _Rp, class _A1>
struct __weak_result_type<_Rp (*)(_A1)>
: public unary_function<_A1, _Rp>
{
};
template <class _Rp, class _Cp>
struct __weak_result_type<_Rp (_Cp::*)()>
: public unary_function<_Cp*, _Rp>
{
};
template <class _Rp, class _Cp>
struct __weak_result_type<_Rp (_Cp::*)() const>
: public unary_function<const _Cp*, _Rp>
{
};
template <class _Rp, class _Cp>
struct __weak_result_type<_Rp (_Cp::*)() volatile>
: public unary_function<volatile _Cp*, _Rp>
{
};
template <class _Rp, class _Cp>
struct __weak_result_type<_Rp (_Cp::*)() const volatile>
: public unary_function<const volatile _Cp*, _Rp>
{
};
// 2 argument case
template <class _Rp, class _A1, class _A2>
struct __weak_result_type<_Rp (_A1, _A2)>
: public binary_function<_A1, _A2, _Rp>
{
};
template <class _Rp, class _A1, class _A2>
struct __weak_result_type<_Rp (*)(_A1, _A2)>
: public binary_function<_A1, _A2, _Rp>
{
};
template <class _Rp, class _A1, class _A2>
struct __weak_result_type<_Rp (&)(_A1, _A2)>
: public binary_function<_A1, _A2, _Rp>
{
};
template <class _Rp, class _Cp, class _A1>
struct __weak_result_type<_Rp (_Cp::*)(_A1)>
: public binary_function<_Cp*, _A1, _Rp>
{
};
template <class _Rp, class _Cp, class _A1>
struct __weak_result_type<_Rp (_Cp::*)(_A1) const>
: public binary_function<const _Cp*, _A1, _Rp>
{
};
template <class _Rp, class _Cp, class _A1>
struct __weak_result_type<_Rp (_Cp::*)(_A1) volatile>
: public binary_function<volatile _Cp*, _A1, _Rp>
{
};
template <class _Rp, class _Cp, class _A1>
struct __weak_result_type<_Rp (_Cp::*)(_A1) const volatile>
: public binary_function<const volatile _Cp*, _A1, _Rp>
{
};
#ifndef _LIBCPP_CXX03_LANG
// 3 or more arguments
template <class _Rp, class _A1, class _A2, class _A3, class ..._A4>
struct __weak_result_type<_Rp (_A1, _A2, _A3, _A4...)>
{
typedef _Rp result_type;
};
template <class _Rp, class _A1, class _A2, class _A3, class ..._A4>
struct __weak_result_type<_Rp (&)(_A1, _A2, _A3, _A4...)>
{
typedef _Rp result_type;
};
template <class _Rp, class _A1, class _A2, class _A3, class ..._A4>
struct __weak_result_type<_Rp (*)(_A1, _A2, _A3, _A4...)>
{
typedef _Rp result_type;
};
template <class _Rp, class _Cp, class _A1, class _A2, class ..._A3>
struct __weak_result_type<_Rp (_Cp::*)(_A1, _A2, _A3...)>
{
typedef _Rp result_type;
};
template <class _Rp, class _Cp, class _A1, class _A2, class ..._A3>
struct __weak_result_type<_Rp (_Cp::*)(_A1, _A2, _A3...) const>
{
typedef _Rp result_type;
};
template <class _Rp, class _Cp, class _A1, class _A2, class ..._A3>
struct __weak_result_type<_Rp (_Cp::*)(_A1, _A2, _A3...) volatile>
{
typedef _Rp result_type;
};
template <class _Rp, class _Cp, class _A1, class _A2, class ..._A3>
struct __weak_result_type<_Rp (_Cp::*)(_A1, _A2, _A3...) const volatile>
{
typedef _Rp result_type;
};
template <class _Tp, class ..._Args>
struct __invoke_return
{
typedef decltype(_VSTD::__invoke(declval<_Tp>(), declval<_Args>()...)) type;
};
#else // defined(_LIBCPP_CXX03_LANG)
#include <__functional_base_03>
#endif // !defined(_LIBCPP_CXX03_LANG)
template <class _Ret, bool = is_void<_Ret>::value>
struct __invoke_void_return_wrapper
{
#ifndef _LIBCPP_CXX03_LANG
template <class ..._Args>
static _Ret __call(_Args&&... __args) {
return _VSTD::__invoke(_VSTD::forward<_Args>(__args)...);
}
#else
template <class _Fn>
static _Ret __call(_Fn __f) {
return _VSTD::__invoke(__f);
}
template <class _Fn, class _A0>
static _Ret __call(_Fn __f, _A0& __a0) {
return _VSTD::__invoke(__f, __a0);
}
template <class _Fn, class _A0, class _A1>
static _Ret __call(_Fn __f, _A0& __a0, _A1& __a1) {
return _VSTD::__invoke(__f, __a0, __a1);
}
template <class _Fn, class _A0, class _A1, class _A2>
static _Ret __call(_Fn __f, _A0& __a0, _A1& __a1, _A2& __a2){
return _VSTD::__invoke(__f, __a0, __a1, __a2);
}
#endif
};
template <class _Ret>
struct __invoke_void_return_wrapper<_Ret, true>
{
#ifndef _LIBCPP_CXX03_LANG
template <class ..._Args>
static void __call(_Args&&... __args) {
_VSTD::__invoke(_VSTD::forward<_Args>(__args)...);
}
#else
template <class _Fn>
static void __call(_Fn __f) {
_VSTD::__invoke(__f);
}
template <class _Fn, class _A0>
static void __call(_Fn __f, _A0& __a0) {
_VSTD::__invoke(__f, __a0);
}
template <class _Fn, class _A0, class _A1>
static void __call(_Fn __f, _A0& __a0, _A1& __a1) {
_VSTD::__invoke(__f, __a0, __a1);
}
template <class _Fn, class _A0, class _A1, class _A2>
static void __call(_Fn __f, _A0& __a0, _A1& __a1, _A2& __a2) {
_VSTD::__invoke(__f, __a0, __a1, __a2);
}
#endif
};
template <class _Tp>
class _LIBCPP_TEMPLATE_VIS reference_wrapper
: public __weak_result_type<_Tp>
{
public:
// types
typedef _Tp type;
private:
type* __f_;
#ifndef _LIBCPP_CXX03_LANG
static void __fun(_Tp&) _NOEXCEPT;
static void __fun(_Tp&&) = delete;
#endif
public:
// construct/copy/destroy
#ifdef _LIBCPP_CXX03_LANG
_LIBCPP_INLINE_VISIBILITY
reference_wrapper(type& __f) _NOEXCEPT
: __f_(_VSTD::addressof(__f)) {}
#else
template <class _Up, class = _EnableIf<!__is_same_uncvref<_Up, reference_wrapper>::value, decltype(__fun(_VSTD::declval<_Up>())) >>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
reference_wrapper(_Up&& __u) _NOEXCEPT_(noexcept(__fun(_VSTD::declval<_Up>()))) {
type& __f = static_cast<_Up&&>(__u);
__f_ = _VSTD::addressof(__f);
}
#endif
// access
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
operator type&() const _NOEXCEPT {return *__f_;}
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
type& get() const _NOEXCEPT {return *__f_;}
#ifndef _LIBCPP_CXX03_LANG
// invoke
template <class... _ArgTypes>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
typename __invoke_of<type&, _ArgTypes...>::type
operator() (_ArgTypes&&... __args) const {
return _VSTD::__invoke(get(), _VSTD::forward<_ArgTypes>(__args)...);
}
#else
_LIBCPP_INLINE_VISIBILITY
typename __invoke_return<type>::type
operator() () const {
return _VSTD::__invoke(get());
}
template <class _A0>
_LIBCPP_INLINE_VISIBILITY
typename __invoke_return0<type, _A0>::type
operator() (_A0& __a0) const {
return _VSTD::__invoke(get(), __a0);
}
template <class _A0>
_LIBCPP_INLINE_VISIBILITY
typename __invoke_return0<type, _A0 const>::type
operator() (_A0 const& __a0) const {
return _VSTD::__invoke(get(), __a0);
}
template <class _A0, class _A1>
_LIBCPP_INLINE_VISIBILITY
typename __invoke_return1<type, _A0, _A1>::type
operator() (_A0& __a0, _A1& __a1) const {
return _VSTD::__invoke(get(), __a0, __a1);
}
template <class _A0, class _A1>
_LIBCPP_INLINE_VISIBILITY
typename __invoke_return1<type, _A0 const, _A1>::type
operator() (_A0 const& __a0, _A1& __a1) const {
return _VSTD::__invoke(get(), __a0, __a1);
}
template <class _A0, class _A1>
_LIBCPP_INLINE_VISIBILITY
typename __invoke_return1<type, _A0, _A1 const>::type
operator() (_A0& __a0, _A1 const& __a1) const {
return _VSTD::__invoke(get(), __a0, __a1);
}
template <class _A0, class _A1>
_LIBCPP_INLINE_VISIBILITY
typename __invoke_return1<type, _A0 const, _A1 const>::type
operator() (_A0 const& __a0, _A1 const& __a1) const {
return _VSTD::__invoke(get(), __a0, __a1);
}
template <class _A0, class _A1, class _A2>
_LIBCPP_INLINE_VISIBILITY
typename __invoke_return2<type, _A0, _A1, _A2>::type
operator() (_A0& __a0, _A1& __a1, _A2& __a2) const {
return _VSTD::__invoke(get(), __a0, __a1, __a2);
}
template <class _A0, class _A1, class _A2>
_LIBCPP_INLINE_VISIBILITY
typename __invoke_return2<type, _A0 const, _A1, _A2>::type
operator() (_A0 const& __a0, _A1& __a1, _A2& __a2) const {
return _VSTD::__invoke(get(), __a0, __a1, __a2);
}
template <class _A0, class _A1, class _A2>
_LIBCPP_INLINE_VISIBILITY
typename __invoke_return2<type, _A0, _A1 const, _A2>::type
operator() (_A0& __a0, _A1 const& __a1, _A2& __a2) const {
return _VSTD::__invoke(get(), __a0, __a1, __a2);
}
template <class _A0, class _A1, class _A2>
_LIBCPP_INLINE_VISIBILITY
typename __invoke_return2<type, _A0, _A1, _A2 const>::type
operator() (_A0& __a0, _A1& __a1, _A2 const& __a2) const {
return _VSTD::__invoke(get(), __a0, __a1, __a2);
}
template <class _A0, class _A1, class _A2>
_LIBCPP_INLINE_VISIBILITY
typename __invoke_return2<type, _A0 const, _A1 const, _A2>::type
operator() (_A0 const& __a0, _A1 const& __a1, _A2& __a2) const {
return _VSTD::__invoke(get(), __a0, __a1, __a2);
}
template <class _A0, class _A1, class _A2>
_LIBCPP_INLINE_VISIBILITY
typename __invoke_return2<type, _A0 const, _A1, _A2 const>::type
operator() (_A0 const& __a0, _A1& __a1, _A2 const& __a2) const {
return _VSTD::__invoke(get(), __a0, __a1, __a2);
}
template <class _A0, class _A1, class _A2>
_LIBCPP_INLINE_VISIBILITY
typename __invoke_return2<type, _A0, _A1 const, _A2 const>::type
operator() (_A0& __a0, _A1 const& __a1, _A2 const& __a2) const {
return _VSTD::__invoke(get(), __a0, __a1, __a2);
}
template <class _A0, class _A1, class _A2>
_LIBCPP_INLINE_VISIBILITY
typename __invoke_return2<type, _A0 const, _A1 const, _A2 const>::type
operator() (_A0 const& __a0, _A1 const& __a1, _A2 const& __a2) const {
return _VSTD::__invoke(get(), __a0, __a1, __a2);
}
#endif // _LIBCPP_CXX03_LANG
};
#ifndef _LIBCPP_HAS_NO_DEDUCTION_GUIDES
template <class _Tp>
reference_wrapper(_Tp&) -> reference_wrapper<_Tp>;
#endif
template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
reference_wrapper<_Tp>
ref(_Tp& __t) _NOEXCEPT
{
return reference_wrapper<_Tp>(__t);
}
template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
reference_wrapper<_Tp>
ref(reference_wrapper<_Tp> __t) _NOEXCEPT
{
return _VSTD::ref(__t.get());
}
template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
reference_wrapper<const _Tp>
cref(const _Tp& __t) _NOEXCEPT
{
return reference_wrapper<const _Tp>(__t);
}
template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
reference_wrapper<const _Tp>
cref(reference_wrapper<_Tp> __t) _NOEXCEPT
{
return _VSTD::cref(__t.get());
}
#ifndef _LIBCPP_CXX03_LANG
template <class _Tp> void ref(const _Tp&&) = delete;
template <class _Tp> void cref(const _Tp&&) = delete;
#endif
#if _LIBCPP_STD_VER > 11
template <class _Tp, class, class = void>
struct __is_transparent : false_type {};
template <class _Tp, class _Up>
struct __is_transparent<_Tp, _Up,
typename __void_t<typename _Tp::is_transparent>::type>
: true_type {};
#endif
// allocator_arg_t
struct _LIBCPP_TEMPLATE_VIS allocator_arg_t { explicit allocator_arg_t() = default; };
#if defined(_LIBCPP_CXX03_LANG) || defined(_LIBCPP_BUILDING_LIBRARY)
extern _LIBCPP_EXPORTED_FROM_ABI const allocator_arg_t allocator_arg;
#else
/* _LIBCPP_INLINE_VAR */ constexpr allocator_arg_t allocator_arg = allocator_arg_t();
#endif
// uses_allocator
template <class _Tp>
struct __has_allocator_type
{
private:
struct __two {char __lx; char __lxx;};
template <class _Up> static __two __test(...);
template <class _Up> static char __test(typename _Up::allocator_type* = 0);
public:
static const bool value = sizeof(__test<_Tp>(0)) == 1;
};
template <class _Tp, class _Alloc, bool = __has_allocator_type<_Tp>::value>
struct __uses_allocator
: public integral_constant<bool,
is_convertible<_Alloc, typename _Tp::allocator_type>::value>
{
};
template <class _Tp, class _Alloc>
struct __uses_allocator<_Tp, _Alloc, false>
: public false_type
{
};
template <class _Tp, class _Alloc>
struct _LIBCPP_TEMPLATE_VIS uses_allocator
: public __uses_allocator<_Tp, _Alloc>
{
};
#if _LIBCPP_STD_VER > 14
template <class _Tp, class _Alloc>
_LIBCPP_INLINE_VAR constexpr size_t uses_allocator_v = uses_allocator<_Tp, _Alloc>::value;
#endif
#ifndef _LIBCPP_CXX03_LANG
// allocator construction
template <class _Tp, class _Alloc, class ..._Args>
struct __uses_alloc_ctor_imp
{
typedef _LIBCPP_NODEBUG_TYPE typename __uncvref<_Alloc>::type _RawAlloc;
static const bool __ua = uses_allocator<_Tp, _RawAlloc>::value;
static const bool __ic =
is_constructible<_Tp, allocator_arg_t, _Alloc, _Args...>::value;
static const int value = __ua ? 2 - __ic : 0;
};
template <class _Tp, class _Alloc, class ..._Args>
struct __uses_alloc_ctor
: integral_constant<int, __uses_alloc_ctor_imp<_Tp, _Alloc, _Args...>::value>
{};
template <class _Tp, class _Allocator, class... _Args>
inline _LIBCPP_INLINE_VISIBILITY
void __user_alloc_construct_impl (integral_constant<int, 0>, _Tp *__storage, const _Allocator &, _Args &&... __args )
{
new (__storage) _Tp (_VSTD::forward<_Args>(__args)...);
}
// FIXME: This should have a version which takes a non-const alloc.
template <class _Tp, class _Allocator, class... _Args>
inline _LIBCPP_INLINE_VISIBILITY
void __user_alloc_construct_impl (integral_constant<int, 1>, _Tp *__storage, const _Allocator &__a, _Args &&... __args )
{
new (__storage) _Tp (allocator_arg, __a, _VSTD::forward<_Args>(__args)...);
}
// FIXME: This should have a version which takes a non-const alloc.
template <class _Tp, class _Allocator, class... _Args>
inline _LIBCPP_INLINE_VISIBILITY
void __user_alloc_construct_impl (integral_constant<int, 2>, _Tp *__storage, const _Allocator &__a, _Args &&... __args )
{
new (__storage) _Tp (_VSTD::forward<_Args>(__args)..., __a);
}
#endif // _LIBCPP_CXX03_LANG
#if _LIBCPP_STD_VER > 14
template <class _Fn, class ..._Args>
_LIBCPP_CONSTEXPR_AFTER_CXX17 invoke_result_t<_Fn, _Args...>
invoke(_Fn&& __f, _Args&&... __args)
noexcept(is_nothrow_invocable_v<_Fn, _Args...>)
{
return _VSTD::__invoke(_VSTD::forward<_Fn>(__f), _VSTD::forward<_Args>(__args)...);
}
#endif // _LIBCPP_STD_VER > 14
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_FUNCTIONAL_BASE
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