mirror of
https://github.com/capstone-engine/llvm-capstone.git
synced 2024-11-23 13:50:11 +00:00
9783f28cbb
This patch runs clang-format on all of libcxx/include and libcxx/src, in
accordance with the RFC discussed at [1]. Follow-up patches will format
the benchmarks, the test suite and remaining parts of the code. I'm
splitting this one into its own patch so the diff is a bit easier to
review.
This patch was generated with:
find libcxx/include libcxx/src -type f \
| grep -v 'module.modulemap.in' \
| grep -v 'CMakeLists.txt' \
| grep -v 'README.txt' \
| grep -v 'libcxx.imp' \
| grep -v '__config_site.in' \
| xargs clang-format -i
A Git merge driver is available in libcxx/utils/clang-format-merge-driver.sh
to help resolve merge and rebase issues across these formatting changes.
[1]: https://discourse.llvm.org/t/rfc-clang-formatting-all-of-libc-once-and-for-all
1305 lines
52 KiB
C++
1305 lines
52 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP_OPTIONAL
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#define _LIBCPP_OPTIONAL
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/*
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optional synopsis
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// C++1z
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namespace std {
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// [optional.optional], class template optional
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template <class T>
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class optional;
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template<class T>
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concept is-derived-from-optional = requires(const T& t) { // exposition only
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[]<class U>(const optional<U>&){ }(t);
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};
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// [optional.nullopt], no-value state indicator
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struct nullopt_t{see below };
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inline constexpr nullopt_t nullopt(unspecified );
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// [optional.bad.access], class bad_optional_access
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class bad_optional_access;
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// [optional.relops], relational operators
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template <class T, class U>
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constexpr bool operator==(const optional<T>&, const optional<U>&);
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template <class T, class U>
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constexpr bool operator!=(const optional<T>&, const optional<U>&);
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template <class T, class U>
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constexpr bool operator<(const optional<T>&, const optional<U>&);
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template <class T, class U>
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constexpr bool operator>(const optional<T>&, const optional<U>&);
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template <class T, class U>
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constexpr bool operator<=(const optional<T>&, const optional<U>&);
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template <class T, class U>
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constexpr bool operator>=(const optional<T>&, const optional<U>&);
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template<class T, three_way_comparable_with<T> U>
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constexpr compare_three_way_result_t<T, U>
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operator<=>(const optional<T>&, const optional<U>&); // since C++20
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// [optional.nullops], comparison with nullopt
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template<class T> constexpr bool operator==(const optional<T>&, nullopt_t) noexcept;
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template<class T> constexpr bool operator==(nullopt_t, const optional<T>&) noexcept; // until C++17
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template<class T> constexpr bool operator!=(const optional<T>&, nullopt_t) noexcept; // until C++17
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template<class T> constexpr bool operator!=(nullopt_t, const optional<T>&) noexcept; // until C++17
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template<class T> constexpr bool operator<(const optional<T>&, nullopt_t) noexcept; // until C++17
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template<class T> constexpr bool operator<(nullopt_t, const optional<T>&) noexcept; // until C++17
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template<class T> constexpr bool operator<=(const optional<T>&, nullopt_t) noexcept; // until C++17
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template<class T> constexpr bool operator<=(nullopt_t, const optional<T>&) noexcept; // until C++17
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template<class T> constexpr bool operator>(const optional<T>&, nullopt_t) noexcept; // until C++17
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template<class T> constexpr bool operator>(nullopt_t, const optional<T>&) noexcept; // until C++17
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template<class T> constexpr bool operator>=(const optional<T>&, nullopt_t) noexcept; // until C++17
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template<class T> constexpr bool operator>=(nullopt_t, const optional<T>&) noexcept; // until C++17
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template<class T>
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constexpr strong_ordering operator<=>(const optional<T>&, nullopt_t) noexcept; // since C++20
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// [optional.comp.with.t], comparison with T
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template<class T, class U> constexpr bool operator==(const optional<T>&, const U&);
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template<class T, class U> constexpr bool operator==(const T&, const optional<U>&);
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template<class T, class U> constexpr bool operator!=(const optional<T>&, const U&);
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template<class T, class U> constexpr bool operator!=(const T&, const optional<U>&);
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template<class T, class U> constexpr bool operator<(const optional<T>&, const U&);
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template<class T, class U> constexpr bool operator<(const T&, const optional<U>&);
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template<class T, class U> constexpr bool operator<=(const optional<T>&, const U&);
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template<class T, class U> constexpr bool operator<=(const T&, const optional<U>&);
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template<class T, class U> constexpr bool operator>(const optional<T>&, const U&);
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template<class T, class U> constexpr bool operator>(const T&, const optional<U>&);
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template<class T, class U> constexpr bool operator>=(const optional<T>&, const U&);
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template<class T, class U> constexpr bool operator>=(const T&, const optional<U>&);
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template<class T, class U>
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requires (!is-derived-from-optional<U>) && three_way_comparable_with<T, U>
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constexpr compare_three_way_result_t<T, U>
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operator<=>(const optional<T>&, const U&); // since C++20
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// [optional.specalg], specialized algorithms
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template<class T>
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void swap(optional<T>&, optional<T>&) noexcept(see below ); // constexpr in C++20
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template<class T>
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constexpr optional<see below > make_optional(T&&);
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template<class T, class... Args>
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constexpr optional<T> make_optional(Args&&... args);
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template<class T, class U, class... Args>
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constexpr optional<T> make_optional(initializer_list<U> il, Args&&... args);
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// [optional.hash], hash support
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template<class T> struct hash;
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template<class T> struct hash<optional<T>>;
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template<class T>
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class optional {
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public:
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using value_type = T;
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// [optional.ctor], constructors
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constexpr optional() noexcept;
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constexpr optional(nullopt_t) noexcept;
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constexpr optional(const optional &);
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constexpr optional(optional &&) noexcept(see below);
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template<class... Args>
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constexpr explicit optional(in_place_t, Args &&...);
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template<class U, class... Args>
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constexpr explicit optional(in_place_t, initializer_list<U>, Args &&...);
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template<class U = T>
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constexpr explicit(see-below) optional(U &&);
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template<class U>
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explicit(see-below) optional(const optional<U> &); // constexpr in C++20
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template<class U>
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explicit(see-below) optional(optional<U> &&); // constexpr in C++20
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// [optional.dtor], destructor
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~optional(); // constexpr in C++20
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// [optional.assign], assignment
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optional &operator=(nullopt_t) noexcept; // constexpr in C++20
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constexpr optional &operator=(const optional &);
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constexpr optional &operator=(optional &&) noexcept(see below);
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template<class U = T> optional &operator=(U &&); // constexpr in C++20
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template<class U> optional &operator=(const optional<U> &); // constexpr in C++20
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template<class U> optional &operator=(optional<U> &&); // constexpr in C++20
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template<class... Args> T& emplace(Args &&...); // constexpr in C++20
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template<class U, class... Args> T& emplace(initializer_list<U>, Args &&...); // constexpr in C++20
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// [optional.swap], swap
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void swap(optional &) noexcept(see below ); // constexpr in C++20
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// [optional.observe], observers
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constexpr T const *operator->() const;
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constexpr T *operator->();
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constexpr T const &operator*() const &;
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constexpr T &operator*() &;
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constexpr T &&operator*() &&;
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constexpr const T &&operator*() const &&;
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constexpr explicit operator bool() const noexcept;
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constexpr bool has_value() const noexcept;
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constexpr T const &value() const &;
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constexpr T &value() &;
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constexpr T &&value() &&;
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constexpr const T &&value() const &&;
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template<class U> constexpr T value_or(U &&) const &;
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template<class U> constexpr T value_or(U &&) &&;
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// [optional.monadic], monadic operations
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template<class F> constexpr auto and_then(F&& f) &; // since C++23
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template<class F> constexpr auto and_then(F&& f) &&; // since C++23
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template<class F> constexpr auto and_then(F&& f) const&; // since C++23
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template<class F> constexpr auto and_then(F&& f) const&&; // since C++23
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template<class F> constexpr auto transform(F&& f) &; // since C++23
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template<class F> constexpr auto transform(F&& f) &&; // since C++23
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template<class F> constexpr auto transform(F&& f) const&; // since C++23
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template<class F> constexpr auto transform(F&& f) const&&; // since C++23
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template<class F> constexpr optional or_else(F&& f) &&; // since C++23
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template<class F> constexpr optional or_else(F&& f) const&; // since C++23
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// [optional.mod], modifiers
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void reset() noexcept; // constexpr in C++20
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private:
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T *val; // exposition only
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};
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template<class T>
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optional(T) -> optional<T>;
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} // namespace std
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*/
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#include <__assert> // all public C++ headers provide the assertion handler
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#include <__availability>
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#include <__compare/compare_three_way_result.h>
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#include <__compare/three_way_comparable.h>
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#include <__concepts/invocable.h>
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#include <__config>
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#include <__exception/exception.h>
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#include <__functional/hash.h>
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#include <__functional/invoke.h>
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#include <__functional/reference_wrapper.h>
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#include <__functional/unary_function.h>
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#include <__memory/addressof.h>
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#include <__memory/construct_at.h>
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#include <__tuple/sfinae_helpers.h>
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#include <__type_traits/add_pointer.h>
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#include <__type_traits/conditional.h>
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#include <__type_traits/conjunction.h>
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#include <__type_traits/decay.h>
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#include <__type_traits/disjunction.h>
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#include <__type_traits/is_array.h>
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#include <__type_traits/is_assignable.h>
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#include <__type_traits/is_constructible.h>
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#include <__type_traits/is_convertible.h>
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#include <__type_traits/is_copy_assignable.h>
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#include <__type_traits/is_copy_constructible.h>
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#include <__type_traits/is_destructible.h>
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#include <__type_traits/is_move_assignable.h>
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#include <__type_traits/is_move_constructible.h>
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#include <__type_traits/is_nothrow_move_assignable.h>
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#include <__type_traits/is_nothrow_move_constructible.h>
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#include <__type_traits/is_object.h>
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#include <__type_traits/is_reference.h>
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#include <__type_traits/is_scalar.h>
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#include <__type_traits/is_swappable.h>
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#include <__type_traits/is_trivially_copy_assignable.h>
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#include <__type_traits/is_trivially_copy_constructible.h>
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#include <__type_traits/is_trivially_destructible.h>
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#include <__type_traits/is_trivially_move_assignable.h>
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#include <__type_traits/is_trivially_move_constructible.h>
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#include <__type_traits/negation.h>
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#include <__type_traits/remove_const.h>
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#include <__type_traits/remove_cvref.h>
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#include <__type_traits/remove_reference.h>
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#include <__utility/declval.h>
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#include <__utility/forward.h>
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#include <__utility/in_place.h>
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#include <__utility/move.h>
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#include <__utility/swap.h>
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#include <__verbose_abort>
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#include <initializer_list>
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#include <new>
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#include <version>
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// standard-mandated includes
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// [optional.syn]
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#include <compare>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_PUSH_MACROS
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#include <__undef_macros>
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namespace std // purposefully not using versioning namespace
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{
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class _LIBCPP_EXPORTED_FROM_ABI _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS bad_optional_access : public exception {
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public:
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_LIBCPP_HIDE_FROM_ABI bad_optional_access() _NOEXCEPT = default;
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_LIBCPP_HIDE_FROM_ABI bad_optional_access(const bad_optional_access&) _NOEXCEPT = default;
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_LIBCPP_HIDE_FROM_ABI bad_optional_access& operator=(const bad_optional_access&) _NOEXCEPT = default;
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// Get the key function ~bad_optional_access() into the dylib
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~bad_optional_access() _NOEXCEPT override;
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const char* what() const _NOEXCEPT override;
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};
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} // namespace std
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#if _LIBCPP_STD_VER >= 17
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_LIBCPP_BEGIN_NAMESPACE_STD
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_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS void
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__throw_bad_optional_access() {
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# ifndef _LIBCPP_HAS_NO_EXCEPTIONS
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throw bad_optional_access();
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# else
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_LIBCPP_VERBOSE_ABORT("bad_optional_access was thrown in -fno-exceptions mode");
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# endif
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}
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struct nullopt_t {
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struct __secret_tag {
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explicit __secret_tag() = default;
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};
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_LIBCPP_HIDE_FROM_ABI constexpr explicit nullopt_t(__secret_tag, __secret_tag) noexcept {}
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};
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inline constexpr nullopt_t nullopt{nullopt_t::__secret_tag{}, nullopt_t::__secret_tag{}};
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struct __optional_construct_from_invoke_tag {};
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template <class _Tp, bool = is_trivially_destructible<_Tp>::value>
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struct __optional_destruct_base;
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template <class _Tp>
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struct __optional_destruct_base<_Tp, false> {
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typedef _Tp value_type;
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static_assert(is_object_v<value_type>, "instantiation of optional with a non-object type is undefined behavior");
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union {
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char __null_state_;
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value_type __val_;
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};
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bool __engaged_;
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 ~__optional_destruct_base() {
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if (__engaged_)
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__val_.~value_type();
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}
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_LIBCPP_HIDE_FROM_ABI constexpr __optional_destruct_base() noexcept : __null_state_(), __engaged_(false) {}
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template <class... _Args>
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_LIBCPP_HIDE_FROM_ABI constexpr explicit __optional_destruct_base(in_place_t, _Args&&... __args)
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: __val_(std::forward<_Args>(__args)...), __engaged_(true) {}
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# if _LIBCPP_STD_VER >= 23
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template <class _Fp, class... _Args>
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_LIBCPP_HIDE_FROM_ABI constexpr __optional_destruct_base(
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__optional_construct_from_invoke_tag, _Fp&& __f, _Args&&... __args)
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: __val_(std::invoke(std::forward<_Fp>(__f), std::forward<_Args>(__args)...)), __engaged_(true) {}
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# endif
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void reset() noexcept {
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if (__engaged_) {
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__val_.~value_type();
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__engaged_ = false;
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}
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}
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};
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template <class _Tp>
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struct __optional_destruct_base<_Tp, true> {
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typedef _Tp value_type;
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static_assert(is_object_v<value_type>, "instantiation of optional with a non-object type is undefined behavior");
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union {
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char __null_state_;
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value_type __val_;
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};
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bool __engaged_;
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_LIBCPP_HIDE_FROM_ABI constexpr __optional_destruct_base() noexcept : __null_state_(), __engaged_(false) {}
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template <class... _Args>
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_LIBCPP_HIDE_FROM_ABI constexpr explicit __optional_destruct_base(in_place_t, _Args&&... __args)
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: __val_(std::forward<_Args>(__args)...), __engaged_(true) {}
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# if _LIBCPP_STD_VER >= 23
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template <class _Fp, class... _Args>
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_LIBCPP_HIDE_FROM_ABI constexpr __optional_destruct_base(
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__optional_construct_from_invoke_tag, _Fp&& __f, _Args&&... __args)
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: __val_(std::invoke(std::forward<_Fp>(__f), std::forward<_Args>(__args)...)), __engaged_(true) {}
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# endif
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void reset() noexcept {
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if (__engaged_) {
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__engaged_ = false;
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}
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}
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};
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template <class _Tp, bool = is_reference<_Tp>::value>
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struct __optional_storage_base : __optional_destruct_base<_Tp> {
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using __base = __optional_destruct_base<_Tp>;
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using value_type = _Tp;
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using __base::__base;
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_LIBCPP_HIDE_FROM_ABI constexpr bool has_value() const noexcept { return this->__engaged_; }
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_LIBCPP_HIDE_FROM_ABI constexpr value_type& __get() & noexcept { return this->__val_; }
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_LIBCPP_HIDE_FROM_ABI constexpr const value_type& __get() const& noexcept { return this->__val_; }
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_LIBCPP_HIDE_FROM_ABI constexpr value_type&& __get() && noexcept { return std::move(this->__val_); }
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_LIBCPP_HIDE_FROM_ABI constexpr const value_type&& __get() const&& noexcept { return std::move(this->__val_); }
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template <class... _Args>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __construct(_Args&&... __args) {
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_LIBCPP_ASSERT_INTERNAL(!has_value(), "__construct called for engaged __optional_storage");
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std::__construct_at(std::addressof(this->__val_), std::forward<_Args>(__args)...);
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this->__engaged_ = true;
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}
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template <class _That>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __construct_from(_That&& __opt) {
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if (__opt.has_value())
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__construct(std::forward<_That>(__opt).__get());
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}
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template <class _That>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __assign_from(_That&& __opt) {
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if (this->__engaged_ == __opt.has_value()) {
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if (this->__engaged_)
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this->__val_ = std::forward<_That>(__opt).__get();
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} else {
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if (this->__engaged_)
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this->reset();
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else
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__construct(std::forward<_That>(__opt).__get());
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}
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}
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};
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// optional<T&> is currently required to be ill-formed. However, it may
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// be allowed in the future. For this reason, it has already been implemented
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// to ensure we can make the change in an ABI-compatible manner.
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template <class _Tp>
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struct __optional_storage_base<_Tp, true> {
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using value_type = _Tp;
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using __raw_type = remove_reference_t<_Tp>;
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__raw_type* __value_;
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template <class _Up>
|
|
static _LIBCPP_HIDE_FROM_ABI constexpr bool __can_bind_reference() {
|
|
using _RawUp = __libcpp_remove_reference_t<_Up>;
|
|
using _UpPtr = _RawUp*;
|
|
using _RawTp = __libcpp_remove_reference_t<_Tp>;
|
|
using _TpPtr = _RawTp*;
|
|
using _CheckLValueArg =
|
|
integral_constant<bool,
|
|
(is_lvalue_reference<_Up>::value && is_convertible<_UpPtr, _TpPtr>::value) ||
|
|
is_same<_RawUp, reference_wrapper<_RawTp>>::value ||
|
|
is_same<_RawUp, reference_wrapper<__remove_const_t<_RawTp>>>::value >;
|
|
return (is_lvalue_reference<_Tp>::value && _CheckLValueArg::value) ||
|
|
(is_rvalue_reference<_Tp>::value && !is_lvalue_reference<_Up>::value &&
|
|
is_convertible<_UpPtr, _TpPtr>::value);
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI constexpr __optional_storage_base() noexcept : __value_(nullptr) {}
|
|
|
|
template <class _UArg>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr explicit __optional_storage_base(in_place_t, _UArg&& __uarg)
|
|
: __value_(std::addressof(__uarg)) {
|
|
static_assert(__can_bind_reference<_UArg>(),
|
|
"Attempted to construct a reference element in tuple from a "
|
|
"possible temporary");
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void reset() noexcept { __value_ = nullptr; }
|
|
|
|
_LIBCPP_HIDE_FROM_ABI constexpr bool has_value() const noexcept { return __value_ != nullptr; }
|
|
|
|
_LIBCPP_HIDE_FROM_ABI constexpr value_type& __get() const& noexcept { return *__value_; }
|
|
|
|
_LIBCPP_HIDE_FROM_ABI constexpr value_type&& __get() const&& noexcept { return std::forward<value_type>(*__value_); }
|
|
|
|
template <class _UArg>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __construct(_UArg&& __val) {
|
|
_LIBCPP_ASSERT_INTERNAL(!has_value(), "__construct called for engaged __optional_storage");
|
|
static_assert(__can_bind_reference<_UArg>(),
|
|
"Attempted to construct a reference element in tuple from a "
|
|
"possible temporary");
|
|
__value_ = std::addressof(__val);
|
|
}
|
|
|
|
template <class _That>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __construct_from(_That&& __opt) {
|
|
if (__opt.has_value())
|
|
__construct(std::forward<_That>(__opt).__get());
|
|
}
|
|
|
|
template <class _That>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __assign_from(_That&& __opt) {
|
|
if (has_value() == __opt.has_value()) {
|
|
if (has_value())
|
|
*__value_ = std::forward<_That>(__opt).__get();
|
|
} else {
|
|
if (has_value())
|
|
reset();
|
|
else
|
|
__construct(std::forward<_That>(__opt).__get());
|
|
}
|
|
}
|
|
};
|
|
|
|
template <class _Tp, bool = is_trivially_copy_constructible<_Tp>::value>
|
|
struct __optional_copy_base : __optional_storage_base<_Tp> {
|
|
using __optional_storage_base<_Tp>::__optional_storage_base;
|
|
};
|
|
|
|
template <class _Tp>
|
|
struct __optional_copy_base<_Tp, false> : __optional_storage_base<_Tp> {
|
|
using __optional_storage_base<_Tp>::__optional_storage_base;
|
|
|
|
_LIBCPP_HIDE_FROM_ABI __optional_copy_base() = default;
|
|
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __optional_copy_base(const __optional_copy_base& __opt) {
|
|
this->__construct_from(__opt);
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI __optional_copy_base(__optional_copy_base&&) = default;
|
|
_LIBCPP_HIDE_FROM_ABI __optional_copy_base& operator=(const __optional_copy_base&) = default;
|
|
_LIBCPP_HIDE_FROM_ABI __optional_copy_base& operator=(__optional_copy_base&&) = default;
|
|
};
|
|
|
|
template <class _Tp, bool = is_trivially_move_constructible<_Tp>::value>
|
|
struct __optional_move_base : __optional_copy_base<_Tp> {
|
|
using __optional_copy_base<_Tp>::__optional_copy_base;
|
|
};
|
|
|
|
template <class _Tp>
|
|
struct __optional_move_base<_Tp, false> : __optional_copy_base<_Tp> {
|
|
using value_type = _Tp;
|
|
using __optional_copy_base<_Tp>::__optional_copy_base;
|
|
|
|
_LIBCPP_HIDE_FROM_ABI __optional_move_base() = default;
|
|
_LIBCPP_HIDE_FROM_ABI __optional_move_base(const __optional_move_base&) = default;
|
|
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
|
|
__optional_move_base(__optional_move_base&& __opt) noexcept(is_nothrow_move_constructible_v<value_type>) {
|
|
this->__construct_from(std::move(__opt));
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI __optional_move_base& operator=(const __optional_move_base&) = default;
|
|
_LIBCPP_HIDE_FROM_ABI __optional_move_base& operator=(__optional_move_base&&) = default;
|
|
};
|
|
|
|
template <class _Tp,
|
|
bool = is_trivially_destructible<_Tp>::value && is_trivially_copy_constructible<_Tp>::value &&
|
|
is_trivially_copy_assignable<_Tp>::value>
|
|
struct __optional_copy_assign_base : __optional_move_base<_Tp> {
|
|
using __optional_move_base<_Tp>::__optional_move_base;
|
|
};
|
|
|
|
template <class _Tp>
|
|
struct __optional_copy_assign_base<_Tp, false> : __optional_move_base<_Tp> {
|
|
using __optional_move_base<_Tp>::__optional_move_base;
|
|
|
|
_LIBCPP_HIDE_FROM_ABI __optional_copy_assign_base() = default;
|
|
_LIBCPP_HIDE_FROM_ABI __optional_copy_assign_base(const __optional_copy_assign_base&) = default;
|
|
_LIBCPP_HIDE_FROM_ABI __optional_copy_assign_base(__optional_copy_assign_base&&) = default;
|
|
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __optional_copy_assign_base&
|
|
operator=(const __optional_copy_assign_base& __opt) {
|
|
this->__assign_from(__opt);
|
|
return *this;
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI __optional_copy_assign_base& operator=(__optional_copy_assign_base&&) = default;
|
|
};
|
|
|
|
template <class _Tp,
|
|
bool = is_trivially_destructible<_Tp>::value && is_trivially_move_constructible<_Tp>::value &&
|
|
is_trivially_move_assignable<_Tp>::value>
|
|
struct __optional_move_assign_base : __optional_copy_assign_base<_Tp> {
|
|
using __optional_copy_assign_base<_Tp>::__optional_copy_assign_base;
|
|
};
|
|
|
|
template <class _Tp>
|
|
struct __optional_move_assign_base<_Tp, false> : __optional_copy_assign_base<_Tp> {
|
|
using value_type = _Tp;
|
|
using __optional_copy_assign_base<_Tp>::__optional_copy_assign_base;
|
|
|
|
_LIBCPP_HIDE_FROM_ABI __optional_move_assign_base() = default;
|
|
_LIBCPP_HIDE_FROM_ABI __optional_move_assign_base(const __optional_move_assign_base& __opt) = default;
|
|
_LIBCPP_HIDE_FROM_ABI __optional_move_assign_base(__optional_move_assign_base&&) = default;
|
|
_LIBCPP_HIDE_FROM_ABI __optional_move_assign_base& operator=(const __optional_move_assign_base&) = default;
|
|
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __optional_move_assign_base&
|
|
operator=(__optional_move_assign_base&& __opt) noexcept(
|
|
is_nothrow_move_assignable_v<value_type> && is_nothrow_move_constructible_v<value_type>) {
|
|
this->__assign_from(std::move(__opt));
|
|
return *this;
|
|
}
|
|
};
|
|
|
|
template <class _Tp>
|
|
using __optional_sfinae_ctor_base_t =
|
|
__sfinae_ctor_base< is_copy_constructible<_Tp>::value, is_move_constructible<_Tp>::value >;
|
|
|
|
template <class _Tp>
|
|
using __optional_sfinae_assign_base_t =
|
|
__sfinae_assign_base< (is_copy_constructible<_Tp>::value && is_copy_assignable<_Tp>::value),
|
|
(is_move_constructible<_Tp>::value && is_move_assignable<_Tp>::value) >;
|
|
|
|
template <class _Tp>
|
|
class optional;
|
|
|
|
# if _LIBCPP_STD_VER >= 20
|
|
|
|
template <class _Tp>
|
|
concept __is_derived_from_optional = requires(const _Tp& __t) { []<class _Up>(const optional<_Up>&) {}(__t); };
|
|
|
|
# endif // _LIBCPP_STD_VER >= 20
|
|
|
|
template <class _Tp>
|
|
struct __is_std_optional : false_type {};
|
|
template <class _Tp>
|
|
struct __is_std_optional<optional<_Tp>> : true_type {};
|
|
|
|
template <class _Tp>
|
|
class _LIBCPP_DECLSPEC_EMPTY_BASES optional
|
|
: private __optional_move_assign_base<_Tp>,
|
|
private __optional_sfinae_ctor_base_t<_Tp>,
|
|
private __optional_sfinae_assign_base_t<_Tp> {
|
|
using __base = __optional_move_assign_base<_Tp>;
|
|
|
|
public:
|
|
using value_type = _Tp;
|
|
|
|
private:
|
|
// Disable the reference extension using this static assert.
|
|
static_assert(!is_same_v<__remove_cvref_t<value_type>, in_place_t>,
|
|
"instantiation of optional with in_place_t is ill-formed");
|
|
static_assert(!is_same_v<__remove_cvref_t<value_type>, nullopt_t>,
|
|
"instantiation of optional with nullopt_t is ill-formed");
|
|
static_assert(!is_reference_v<value_type>, "instantiation of optional with a reference type is ill-formed");
|
|
static_assert(is_destructible_v<value_type>, "instantiation of optional with a non-destructible type is ill-formed");
|
|
static_assert(!is_array_v<value_type>, "instantiation of optional with an array type is ill-formed");
|
|
|
|
// LWG2756: conditionally explicit conversion from _Up
|
|
struct _CheckOptionalArgsConstructor {
|
|
template <class _Up>
|
|
_LIBCPP_HIDE_FROM_ABI static constexpr bool __enable_implicit() {
|
|
return is_constructible_v<_Tp, _Up&&> && is_convertible_v<_Up&&, _Tp>;
|
|
}
|
|
|
|
template <class _Up>
|
|
_LIBCPP_HIDE_FROM_ABI static constexpr bool __enable_explicit() {
|
|
return is_constructible_v<_Tp, _Up&&> && !is_convertible_v<_Up&&, _Tp>;
|
|
}
|
|
};
|
|
template <class _Up>
|
|
using _CheckOptionalArgsCtor =
|
|
_If< _IsNotSame<__remove_cvref_t<_Up>, in_place_t>::value && _IsNotSame<__remove_cvref_t<_Up>, optional>::value &&
|
|
(!is_same_v<remove_cv_t<_Tp>, bool> || !__is_std_optional<__remove_cvref_t<_Up>>::value),
|
|
_CheckOptionalArgsConstructor,
|
|
__check_tuple_constructor_fail >;
|
|
template <class _QualUp>
|
|
struct _CheckOptionalLikeConstructor {
|
|
template <class _Up, class _Opt = optional<_Up>>
|
|
using __check_constructible_from_opt =
|
|
_Or< is_constructible<_Tp, _Opt&>,
|
|
is_constructible<_Tp, _Opt const&>,
|
|
is_constructible<_Tp, _Opt&&>,
|
|
is_constructible<_Tp, _Opt const&&>,
|
|
is_convertible<_Opt&, _Tp>,
|
|
is_convertible<_Opt const&, _Tp>,
|
|
is_convertible<_Opt&&, _Tp>,
|
|
is_convertible<_Opt const&&, _Tp> >;
|
|
template <class _Up, class _Opt = optional<_Up>>
|
|
using __check_assignable_from_opt =
|
|
_Or< is_assignable<_Tp&, _Opt&>,
|
|
is_assignable<_Tp&, _Opt const&>,
|
|
is_assignable<_Tp&, _Opt&&>,
|
|
is_assignable<_Tp&, _Opt const&&> >;
|
|
template <class _Up, class _QUp = _QualUp>
|
|
_LIBCPP_HIDE_FROM_ABI static constexpr bool __enable_implicit() {
|
|
return is_convertible<_QUp, _Tp>::value &&
|
|
(is_same_v<remove_cv_t<_Tp>, bool> || !__check_constructible_from_opt<_Up>::value);
|
|
}
|
|
template <class _Up, class _QUp = _QualUp>
|
|
_LIBCPP_HIDE_FROM_ABI static constexpr bool __enable_explicit() {
|
|
return !is_convertible<_QUp, _Tp>::value &&
|
|
(is_same_v<remove_cv_t<_Tp>, bool> || !__check_constructible_from_opt<_Up>::value);
|
|
}
|
|
template <class _Up, class _QUp = _QualUp>
|
|
_LIBCPP_HIDE_FROM_ABI static constexpr bool __enable_assign() {
|
|
// Construction and assignability of _QUp to _Tp has already been
|
|
// checked.
|
|
return !__check_constructible_from_opt<_Up>::value && !__check_assignable_from_opt<_Up>::value;
|
|
}
|
|
};
|
|
|
|
template <class _Up, class _QualUp>
|
|
using _CheckOptionalLikeCtor =
|
|
_If< _And< _IsNotSame<_Up, _Tp>, is_constructible<_Tp, _QualUp> >::value,
|
|
_CheckOptionalLikeConstructor<_QualUp>,
|
|
__check_tuple_constructor_fail >;
|
|
template <class _Up, class _QualUp>
|
|
using _CheckOptionalLikeAssign =
|
|
_If< _And< _IsNotSame<_Up, _Tp>, is_constructible<_Tp, _QualUp>, is_assignable<_Tp&, _QualUp> >::value,
|
|
_CheckOptionalLikeConstructor<_QualUp>,
|
|
__check_tuple_constructor_fail >;
|
|
|
|
public:
|
|
_LIBCPP_HIDE_FROM_ABI constexpr optional() noexcept {}
|
|
_LIBCPP_HIDE_FROM_ABI constexpr optional(const optional&) = default;
|
|
_LIBCPP_HIDE_FROM_ABI constexpr optional(optional&&) = default;
|
|
_LIBCPP_HIDE_FROM_ABI constexpr optional(nullopt_t) noexcept {}
|
|
|
|
template <
|
|
class _InPlaceT,
|
|
class... _Args,
|
|
class = enable_if_t< _And< _IsSame<_InPlaceT, in_place_t>, is_constructible<value_type, _Args...> >::value > >
|
|
_LIBCPP_HIDE_FROM_ABI constexpr explicit optional(_InPlaceT, _Args&&... __args)
|
|
: __base(in_place, std::forward<_Args>(__args)...) {}
|
|
|
|
template <class _Up,
|
|
class... _Args,
|
|
class = enable_if_t< is_constructible_v<value_type, initializer_list<_Up>&, _Args...>> >
|
|
_LIBCPP_HIDE_FROM_ABI constexpr explicit optional(in_place_t, initializer_list<_Up> __il, _Args&&... __args)
|
|
: __base(in_place, __il, std::forward<_Args>(__args)...) {}
|
|
|
|
template <class _Up = value_type,
|
|
enable_if_t< _CheckOptionalArgsCtor<_Up>::template __enable_implicit<_Up>(), int> = 0>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr optional(_Up&& __v) : __base(in_place, std::forward<_Up>(__v)) {}
|
|
|
|
template <class _Up, enable_if_t< _CheckOptionalArgsCtor<_Up>::template __enable_explicit<_Up>(), int> = 0>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr explicit optional(_Up&& __v) : __base(in_place, std::forward<_Up>(__v)) {}
|
|
|
|
// LWG2756: conditionally explicit conversion from const optional<_Up>&
|
|
template <class _Up,
|
|
enable_if_t< _CheckOptionalLikeCtor<_Up, _Up const&>::template __enable_implicit<_Up>(), int> = 0>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 optional(const optional<_Up>& __v) {
|
|
this->__construct_from(__v);
|
|
}
|
|
template <class _Up,
|
|
enable_if_t< _CheckOptionalLikeCtor<_Up, _Up const&>::template __enable_explicit<_Up>(), int> = 0>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit optional(const optional<_Up>& __v) {
|
|
this->__construct_from(__v);
|
|
}
|
|
|
|
// LWG2756: conditionally explicit conversion from optional<_Up>&&
|
|
template <class _Up, enable_if_t< _CheckOptionalLikeCtor<_Up, _Up&&>::template __enable_implicit<_Up>(), int> = 0>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 optional(optional<_Up>&& __v) {
|
|
this->__construct_from(std::move(__v));
|
|
}
|
|
template <class _Up, enable_if_t< _CheckOptionalLikeCtor<_Up, _Up&&>::template __enable_explicit<_Up>(), int> = 0>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit optional(optional<_Up>&& __v) {
|
|
this->__construct_from(std::move(__v));
|
|
}
|
|
|
|
# if _LIBCPP_STD_VER >= 23
|
|
template <class _Fp, class... _Args>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr explicit optional(__optional_construct_from_invoke_tag, _Fp&& __f, _Args&&... __args)
|
|
: __base(__optional_construct_from_invoke_tag{}, std::forward<_Fp>(__f), std::forward<_Args>(__args)...) {}
|
|
# endif
|
|
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 optional& operator=(nullopt_t) noexcept {
|
|
reset();
|
|
return *this;
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI constexpr optional& operator=(const optional&) = default;
|
|
_LIBCPP_HIDE_FROM_ABI constexpr optional& operator=(optional&&) = default;
|
|
|
|
// LWG2756
|
|
template <
|
|
class _Up = value_type,
|
|
class = enable_if_t< _And< _IsNotSame<__remove_cvref_t<_Up>, optional>,
|
|
_Or< _IsNotSame<__remove_cvref_t<_Up>, value_type>, _Not<is_scalar<value_type>> >,
|
|
is_constructible<value_type, _Up>,
|
|
is_assignable<value_type&, _Up> >::value> >
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 optional& operator=(_Up&& __v) {
|
|
if (this->has_value())
|
|
this->__get() = std::forward<_Up>(__v);
|
|
else
|
|
this->__construct(std::forward<_Up>(__v));
|
|
return *this;
|
|
}
|
|
|
|
// LWG2756
|
|
template <class _Up,
|
|
enable_if_t< _CheckOptionalLikeAssign<_Up, _Up const&>::template __enable_assign<_Up>(), int> = 0>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 optional& operator=(const optional<_Up>& __v) {
|
|
this->__assign_from(__v);
|
|
return *this;
|
|
}
|
|
|
|
// LWG2756
|
|
template <class _Up, enable_if_t< _CheckOptionalLikeCtor<_Up, _Up&&>::template __enable_assign<_Up>(), int> = 0>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 optional& operator=(optional<_Up>&& __v) {
|
|
this->__assign_from(std::move(__v));
|
|
return *this;
|
|
}
|
|
|
|
template <class... _Args, class = enable_if_t< is_constructible_v<value_type, _Args...> > >
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Tp& emplace(_Args&&... __args) {
|
|
reset();
|
|
this->__construct(std::forward<_Args>(__args)...);
|
|
return this->__get();
|
|
}
|
|
|
|
template <class _Up,
|
|
class... _Args,
|
|
class = enable_if_t< is_constructible_v<value_type, initializer_list<_Up>&, _Args...> > >
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Tp& emplace(initializer_list<_Up> __il, _Args&&... __args) {
|
|
reset();
|
|
this->__construct(__il, std::forward<_Args>(__args)...);
|
|
return this->__get();
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void
|
|
swap(optional& __opt) noexcept(is_nothrow_move_constructible_v<value_type> && is_nothrow_swappable_v<value_type>) {
|
|
if (this->has_value() == __opt.has_value()) {
|
|
using std::swap;
|
|
if (this->has_value())
|
|
swap(this->__get(), __opt.__get());
|
|
} else {
|
|
if (this->has_value()) {
|
|
__opt.__construct(std::move(this->__get()));
|
|
reset();
|
|
} else {
|
|
this->__construct(std::move(__opt.__get()));
|
|
__opt.reset();
|
|
}
|
|
}
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI constexpr add_pointer_t<value_type const> operator->() const {
|
|
_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(this->has_value(), "optional operator-> called on a disengaged value");
|
|
return std::addressof(this->__get());
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI constexpr add_pointer_t<value_type> operator->() {
|
|
_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(this->has_value(), "optional operator-> called on a disengaged value");
|
|
return std::addressof(this->__get());
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI constexpr const value_type& operator*() const& noexcept {
|
|
_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(this->has_value(), "optional operator* called on a disengaged value");
|
|
return this->__get();
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI constexpr value_type& operator*() & noexcept {
|
|
_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(this->has_value(), "optional operator* called on a disengaged value");
|
|
return this->__get();
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI constexpr value_type&& operator*() && noexcept {
|
|
_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(this->has_value(), "optional operator* called on a disengaged value");
|
|
return std::move(this->__get());
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI constexpr const value_type&& operator*() const&& noexcept {
|
|
_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(this->has_value(), "optional operator* called on a disengaged value");
|
|
return std::move(this->__get());
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI constexpr explicit operator bool() const noexcept { return has_value(); }
|
|
|
|
using __base::__get;
|
|
using __base::has_value;
|
|
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS constexpr value_type const& value() const& {
|
|
if (!this->has_value())
|
|
__throw_bad_optional_access();
|
|
return this->__get();
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS constexpr value_type& value() & {
|
|
if (!this->has_value())
|
|
__throw_bad_optional_access();
|
|
return this->__get();
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS constexpr value_type&& value() && {
|
|
if (!this->has_value())
|
|
__throw_bad_optional_access();
|
|
return std::move(this->__get());
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS constexpr value_type const&& value() const&& {
|
|
if (!this->has_value())
|
|
__throw_bad_optional_access();
|
|
return std::move(this->__get());
|
|
}
|
|
|
|
template <class _Up>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr value_type value_or(_Up&& __v) const& {
|
|
static_assert(is_copy_constructible_v<value_type>, "optional<T>::value_or: T must be copy constructible");
|
|
static_assert(is_convertible_v<_Up, value_type>, "optional<T>::value_or: U must be convertible to T");
|
|
return this->has_value() ? this->__get() : static_cast<value_type>(std::forward<_Up>(__v));
|
|
}
|
|
|
|
template <class _Up>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr value_type value_or(_Up&& __v) && {
|
|
static_assert(is_move_constructible_v<value_type>, "optional<T>::value_or: T must be move constructible");
|
|
static_assert(is_convertible_v<_Up, value_type>, "optional<T>::value_or: U must be convertible to T");
|
|
return this->has_value() ? std::move(this->__get()) : static_cast<value_type>(std::forward<_Up>(__v));
|
|
}
|
|
|
|
# if _LIBCPP_STD_VER >= 23
|
|
template <class _Func>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS constexpr auto and_then(_Func&& __f) & {
|
|
using _Up = invoke_result_t<_Func, value_type&>;
|
|
static_assert(__is_std_optional<remove_cvref_t<_Up>>::value,
|
|
"Result of f(value()) must be a specialization of std::optional");
|
|
if (*this)
|
|
return std::invoke(std::forward<_Func>(__f), value());
|
|
return remove_cvref_t<_Up>();
|
|
}
|
|
|
|
template <class _Func>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS constexpr auto and_then(_Func&& __f) const& {
|
|
using _Up = invoke_result_t<_Func, const value_type&>;
|
|
static_assert(__is_std_optional<remove_cvref_t<_Up>>::value,
|
|
"Result of f(value()) must be a specialization of std::optional");
|
|
if (*this)
|
|
return std::invoke(std::forward<_Func>(__f), value());
|
|
return remove_cvref_t<_Up>();
|
|
}
|
|
|
|
template <class _Func>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS constexpr auto and_then(_Func&& __f) && {
|
|
using _Up = invoke_result_t<_Func, value_type&&>;
|
|
static_assert(__is_std_optional<remove_cvref_t<_Up>>::value,
|
|
"Result of f(std::move(value())) must be a specialization of std::optional");
|
|
if (*this)
|
|
return std::invoke(std::forward<_Func>(__f), std::move(value()));
|
|
return remove_cvref_t<_Up>();
|
|
}
|
|
|
|
template <class _Func>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr auto and_then(_Func&& __f) const&& {
|
|
using _Up = invoke_result_t<_Func, const value_type&&>;
|
|
static_assert(__is_std_optional<remove_cvref_t<_Up>>::value,
|
|
"Result of f(std::move(value())) must be a specialization of std::optional");
|
|
if (*this)
|
|
return std::invoke(std::forward<_Func>(__f), std::move(value()));
|
|
return remove_cvref_t<_Up>();
|
|
}
|
|
|
|
template <class _Func>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS constexpr auto transform(_Func&& __f) & {
|
|
using _Up = remove_cv_t<invoke_result_t<_Func, value_type&>>;
|
|
static_assert(!is_array_v<_Up>, "Result of f(value()) should not be an Array");
|
|
static_assert(!is_same_v<_Up, in_place_t>, "Result of f(value()) should not be std::in_place_t");
|
|
static_assert(!is_same_v<_Up, nullopt_t>, "Result of f(value()) should not be std::nullopt_t");
|
|
static_assert(is_object_v<_Up>, "Result of f(value()) should be an object type");
|
|
if (*this)
|
|
return optional<_Up>(__optional_construct_from_invoke_tag{}, std::forward<_Func>(__f), value());
|
|
return optional<_Up>();
|
|
}
|
|
|
|
template <class _Func>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS constexpr auto transform(_Func&& __f) const& {
|
|
using _Up = remove_cv_t<invoke_result_t<_Func, const value_type&>>;
|
|
static_assert(!is_array_v<_Up>, "Result of f(value()) should not be an Array");
|
|
static_assert(!is_same_v<_Up, in_place_t>, "Result of f(value()) should not be std::in_place_t");
|
|
static_assert(!is_same_v<_Up, nullopt_t>, "Result of f(value()) should not be std::nullopt_t");
|
|
static_assert(is_object_v<_Up>, "Result of f(value()) should be an object type");
|
|
if (*this)
|
|
return optional<_Up>(__optional_construct_from_invoke_tag{}, std::forward<_Func>(__f), value());
|
|
return optional<_Up>();
|
|
}
|
|
|
|
template <class _Func>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS constexpr auto transform(_Func&& __f) && {
|
|
using _Up = remove_cv_t<invoke_result_t<_Func, value_type&&>>;
|
|
static_assert(!is_array_v<_Up>, "Result of f(std::move(value())) should not be an Array");
|
|
static_assert(!is_same_v<_Up, in_place_t>, "Result of f(std::move(value())) should not be std::in_place_t");
|
|
static_assert(!is_same_v<_Up, nullopt_t>, "Result of f(std::move(value())) should not be std::nullopt_t");
|
|
static_assert(is_object_v<_Up>, "Result of f(std::move(value())) should be an object type");
|
|
if (*this)
|
|
return optional<_Up>(__optional_construct_from_invoke_tag{}, std::forward<_Func>(__f), std::move(value()));
|
|
return optional<_Up>();
|
|
}
|
|
|
|
template <class _Func>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS constexpr auto transform(_Func&& __f) const&& {
|
|
using _Up = remove_cvref_t<invoke_result_t<_Func, const value_type&&>>;
|
|
static_assert(!is_array_v<_Up>, "Result of f(std::move(value())) should not be an Array");
|
|
static_assert(!is_same_v<_Up, in_place_t>, "Result of f(std::move(value())) should not be std::in_place_t");
|
|
static_assert(!is_same_v<_Up, nullopt_t>, "Result of f(std::move(value())) should not be std::nullopt_t");
|
|
static_assert(is_object_v<_Up>, "Result of f(std::move(value())) should be an object type");
|
|
if (*this)
|
|
return optional<_Up>(__optional_construct_from_invoke_tag{}, std::forward<_Func>(__f), std::move(value()));
|
|
return optional<_Up>();
|
|
}
|
|
|
|
template <invocable _Func>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr optional or_else(_Func&& __f) const&
|
|
requires is_copy_constructible_v<value_type>
|
|
{
|
|
static_assert(is_same_v<remove_cvref_t<invoke_result_t<_Func>>, optional>,
|
|
"Result of f() should be the same type as this optional");
|
|
if (*this)
|
|
return *this;
|
|
return std::forward<_Func>(__f)();
|
|
}
|
|
|
|
template <invocable _Func>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr optional or_else(_Func&& __f) &&
|
|
requires is_move_constructible_v<value_type>
|
|
{
|
|
static_assert(is_same_v<remove_cvref_t<invoke_result_t<_Func>>, optional>,
|
|
"Result of f() should be the same type as this optional");
|
|
if (*this)
|
|
return std::move(*this);
|
|
return std::forward<_Func>(__f)();
|
|
}
|
|
# endif // _LIBCPP_STD_VER >= 23
|
|
|
|
using __base::reset;
|
|
};
|
|
|
|
# if _LIBCPP_STD_VER >= 17
|
|
template <class _Tp>
|
|
optional(_Tp) -> optional<_Tp>;
|
|
# endif
|
|
|
|
// Comparisons between optionals
|
|
template <class _Tp, class _Up>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr enable_if_t<
|
|
is_convertible_v<decltype(std::declval<const _Tp&>() == std::declval<const _Up&>()), bool>,
|
|
bool >
|
|
operator==(const optional<_Tp>& __x, const optional<_Up>& __y) {
|
|
if (static_cast<bool>(__x) != static_cast<bool>(__y))
|
|
return false;
|
|
if (!static_cast<bool>(__x))
|
|
return true;
|
|
return *__x == *__y;
|
|
}
|
|
|
|
template <class _Tp, class _Up>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr enable_if_t<
|
|
is_convertible_v<decltype(std::declval<const _Tp&>() != std::declval<const _Up&>()), bool>,
|
|
bool >
|
|
operator!=(const optional<_Tp>& __x, const optional<_Up>& __y) {
|
|
if (static_cast<bool>(__x) != static_cast<bool>(__y))
|
|
return true;
|
|
if (!static_cast<bool>(__x))
|
|
return false;
|
|
return *__x != *__y;
|
|
}
|
|
|
|
template <class _Tp, class _Up>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr enable_if_t<
|
|
is_convertible_v<decltype(std::declval<const _Tp&>() < std::declval<const _Up&>()), bool>,
|
|
bool >
|
|
operator<(const optional<_Tp>& __x, const optional<_Up>& __y) {
|
|
if (!static_cast<bool>(__y))
|
|
return false;
|
|
if (!static_cast<bool>(__x))
|
|
return true;
|
|
return *__x < *__y;
|
|
}
|
|
|
|
template <class _Tp, class _Up>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr enable_if_t<
|
|
is_convertible_v<decltype(std::declval<const _Tp&>() > std::declval<const _Up&>()), bool>,
|
|
bool >
|
|
operator>(const optional<_Tp>& __x, const optional<_Up>& __y) {
|
|
if (!static_cast<bool>(__x))
|
|
return false;
|
|
if (!static_cast<bool>(__y))
|
|
return true;
|
|
return *__x > *__y;
|
|
}
|
|
|
|
template <class _Tp, class _Up>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr enable_if_t<
|
|
is_convertible_v<decltype(std::declval<const _Tp&>() <= std::declval<const _Up&>()), bool>,
|
|
bool >
|
|
operator<=(const optional<_Tp>& __x, const optional<_Up>& __y) {
|
|
if (!static_cast<bool>(__x))
|
|
return true;
|
|
if (!static_cast<bool>(__y))
|
|
return false;
|
|
return *__x <= *__y;
|
|
}
|
|
|
|
template <class _Tp, class _Up>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr enable_if_t<
|
|
is_convertible_v<decltype(std::declval<const _Tp&>() >= std::declval<const _Up&>()), bool>,
|
|
bool >
|
|
operator>=(const optional<_Tp>& __x, const optional<_Up>& __y) {
|
|
if (!static_cast<bool>(__y))
|
|
return true;
|
|
if (!static_cast<bool>(__x))
|
|
return false;
|
|
return *__x >= *__y;
|
|
}
|
|
|
|
# if _LIBCPP_STD_VER >= 20
|
|
|
|
template <class _Tp, three_way_comparable_with<_Tp> _Up>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr compare_three_way_result_t<_Tp, _Up>
|
|
operator<=>(const optional<_Tp>& __x, const optional<_Up>& __y) {
|
|
if (__x && __y)
|
|
return *__x <=> *__y;
|
|
return __x.has_value() <=> __y.has_value();
|
|
}
|
|
|
|
# endif // _LIBCPP_STD_VER >= 20
|
|
|
|
// Comparisons with nullopt
|
|
template <class _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr bool operator==(const optional<_Tp>& __x, nullopt_t) noexcept {
|
|
return !static_cast<bool>(__x);
|
|
}
|
|
|
|
# if _LIBCPP_STD_VER <= 17
|
|
|
|
template <class _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr bool operator==(nullopt_t, const optional<_Tp>& __x) noexcept {
|
|
return !static_cast<bool>(__x);
|
|
}
|
|
|
|
template <class _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr bool operator!=(const optional<_Tp>& __x, nullopt_t) noexcept {
|
|
return static_cast<bool>(__x);
|
|
}
|
|
|
|
template <class _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr bool operator!=(nullopt_t, const optional<_Tp>& __x) noexcept {
|
|
return static_cast<bool>(__x);
|
|
}
|
|
|
|
template <class _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr bool operator<(const optional<_Tp>&, nullopt_t) noexcept {
|
|
return false;
|
|
}
|
|
|
|
template <class _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr bool operator<(nullopt_t, const optional<_Tp>& __x) noexcept {
|
|
return static_cast<bool>(__x);
|
|
}
|
|
|
|
template <class _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr bool operator<=(const optional<_Tp>& __x, nullopt_t) noexcept {
|
|
return !static_cast<bool>(__x);
|
|
}
|
|
|
|
template <class _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr bool operator<=(nullopt_t, const optional<_Tp>&) noexcept {
|
|
return true;
|
|
}
|
|
|
|
template <class _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr bool operator>(const optional<_Tp>& __x, nullopt_t) noexcept {
|
|
return static_cast<bool>(__x);
|
|
}
|
|
|
|
template <class _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr bool operator>(nullopt_t, const optional<_Tp>&) noexcept {
|
|
return false;
|
|
}
|
|
|
|
template <class _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr bool operator>=(const optional<_Tp>&, nullopt_t) noexcept {
|
|
return true;
|
|
}
|
|
|
|
template <class _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr bool operator>=(nullopt_t, const optional<_Tp>& __x) noexcept {
|
|
return !static_cast<bool>(__x);
|
|
}
|
|
|
|
# else // _LIBCPP_STD_VER <= 17
|
|
|
|
template <class _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr strong_ordering operator<=>(const optional<_Tp>& __x, nullopt_t) noexcept {
|
|
return __x.has_value() <=> false;
|
|
}
|
|
|
|
# endif // _LIBCPP_STD_VER <= 17
|
|
|
|
// Comparisons with T
|
|
template <class _Tp, class _Up>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr enable_if_t<
|
|
is_convertible_v<decltype(std::declval<const _Tp&>() == std::declval<const _Up&>()), bool>,
|
|
bool >
|
|
operator==(const optional<_Tp>& __x, const _Up& __v) {
|
|
return static_cast<bool>(__x) ? *__x == __v : false;
|
|
}
|
|
|
|
template <class _Tp, class _Up>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr enable_if_t<
|
|
is_convertible_v<decltype(std::declval<const _Tp&>() == std::declval<const _Up&>()), bool>,
|
|
bool >
|
|
operator==(const _Tp& __v, const optional<_Up>& __x) {
|
|
return static_cast<bool>(__x) ? __v == *__x : false;
|
|
}
|
|
|
|
template <class _Tp, class _Up>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr enable_if_t<
|
|
is_convertible_v<decltype(std::declval<const _Tp&>() != std::declval<const _Up&>()), bool>,
|
|
bool >
|
|
operator!=(const optional<_Tp>& __x, const _Up& __v) {
|
|
return static_cast<bool>(__x) ? *__x != __v : true;
|
|
}
|
|
|
|
template <class _Tp, class _Up>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr enable_if_t<
|
|
is_convertible_v<decltype(std::declval<const _Tp&>() != std::declval<const _Up&>()), bool>,
|
|
bool >
|
|
operator!=(const _Tp& __v, const optional<_Up>& __x) {
|
|
return static_cast<bool>(__x) ? __v != *__x : true;
|
|
}
|
|
|
|
template <class _Tp, class _Up>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr enable_if_t<
|
|
is_convertible_v<decltype(std::declval<const _Tp&>() < std::declval<const _Up&>()), bool>,
|
|
bool >
|
|
operator<(const optional<_Tp>& __x, const _Up& __v) {
|
|
return static_cast<bool>(__x) ? *__x < __v : true;
|
|
}
|
|
|
|
template <class _Tp, class _Up>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr enable_if_t<
|
|
is_convertible_v<decltype(std::declval<const _Tp&>() < std::declval<const _Up&>()), bool>,
|
|
bool >
|
|
operator<(const _Tp& __v, const optional<_Up>& __x) {
|
|
return static_cast<bool>(__x) ? __v < *__x : false;
|
|
}
|
|
|
|
template <class _Tp, class _Up>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr enable_if_t<
|
|
is_convertible_v<decltype(std::declval<const _Tp&>() <= std::declval<const _Up&>()), bool>,
|
|
bool >
|
|
operator<=(const optional<_Tp>& __x, const _Up& __v) {
|
|
return static_cast<bool>(__x) ? *__x <= __v : true;
|
|
}
|
|
|
|
template <class _Tp, class _Up>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr enable_if_t<
|
|
is_convertible_v<decltype(std::declval<const _Tp&>() <= std::declval<const _Up&>()), bool>,
|
|
bool >
|
|
operator<=(const _Tp& __v, const optional<_Up>& __x) {
|
|
return static_cast<bool>(__x) ? __v <= *__x : false;
|
|
}
|
|
|
|
template <class _Tp, class _Up>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr enable_if_t<
|
|
is_convertible_v<decltype(std::declval<const _Tp&>() > std::declval<const _Up&>()), bool>,
|
|
bool >
|
|
operator>(const optional<_Tp>& __x, const _Up& __v) {
|
|
return static_cast<bool>(__x) ? *__x > __v : false;
|
|
}
|
|
|
|
template <class _Tp, class _Up>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr enable_if_t<
|
|
is_convertible_v<decltype(std::declval<const _Tp&>() > std::declval<const _Up&>()), bool>,
|
|
bool >
|
|
operator>(const _Tp& __v, const optional<_Up>& __x) {
|
|
return static_cast<bool>(__x) ? __v > *__x : true;
|
|
}
|
|
|
|
template <class _Tp, class _Up>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr enable_if_t<
|
|
is_convertible_v<decltype(std::declval<const _Tp&>() >= std::declval<const _Up&>()), bool>,
|
|
bool >
|
|
operator>=(const optional<_Tp>& __x, const _Up& __v) {
|
|
return static_cast<bool>(__x) ? *__x >= __v : false;
|
|
}
|
|
|
|
template <class _Tp, class _Up>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr enable_if_t<
|
|
is_convertible_v<decltype(std::declval<const _Tp&>() >= std::declval<const _Up&>()), bool>,
|
|
bool >
|
|
operator>=(const _Tp& __v, const optional<_Up>& __x) {
|
|
return static_cast<bool>(__x) ? __v >= *__x : true;
|
|
}
|
|
|
|
# if _LIBCPP_STD_VER >= 20
|
|
|
|
template <class _Tp, class _Up>
|
|
requires(!__is_derived_from_optional<_Up>) && three_way_comparable_with<_Tp, _Up>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr compare_three_way_result_t<_Tp, _Up>
|
|
operator<=>(const optional<_Tp>& __x, const _Up& __v) {
|
|
return __x.has_value() ? *__x <=> __v : strong_ordering::less;
|
|
}
|
|
|
|
# endif // _LIBCPP_STD_VER >= 20
|
|
|
|
template <class _Tp>
|
|
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
|
|
enable_if_t< is_move_constructible_v<_Tp> && is_swappable_v<_Tp>, void >
|
|
swap(optional<_Tp>& __x, optional<_Tp>& __y) noexcept(noexcept(__x.swap(__y))) {
|
|
__x.swap(__y);
|
|
}
|
|
|
|
template <class _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr optional<decay_t<_Tp>> make_optional(_Tp&& __v) {
|
|
return optional<decay_t<_Tp>>(std::forward<_Tp>(__v));
|
|
}
|
|
|
|
template <class _Tp, class... _Args>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr optional<_Tp> make_optional(_Args&&... __args) {
|
|
return optional<_Tp>(in_place, std::forward<_Args>(__args)...);
|
|
}
|
|
|
|
template <class _Tp, class _Up, class... _Args>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr optional<_Tp> make_optional(initializer_list<_Up> __il, _Args&&... __args) {
|
|
return optional<_Tp>(in_place, __il, std::forward<_Args>(__args)...);
|
|
}
|
|
|
|
template <class _Tp>
|
|
struct _LIBCPP_TEMPLATE_VIS hash< __enable_hash_helper<optional<_Tp>, remove_const_t<_Tp>> > {
|
|
# if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS)
|
|
_LIBCPP_DEPRECATED_IN_CXX17 typedef optional<_Tp> argument_type;
|
|
_LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type;
|
|
# endif
|
|
|
|
_LIBCPP_HIDE_FROM_ABI size_t operator()(const optional<_Tp>& __opt) const {
|
|
return static_cast<bool>(__opt) ? hash<remove_const_t<_Tp>>()(*__opt) : 0;
|
|
}
|
|
};
|
|
|
|
_LIBCPP_END_NAMESPACE_STD
|
|
|
|
#endif // _LIBCPP_STD_VER >= 17
|
|
|
|
_LIBCPP_POP_MACROS
|
|
|
|
#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
|
|
# include <atomic>
|
|
# include <climits>
|
|
# include <concepts>
|
|
# include <ctime>
|
|
# include <iterator>
|
|
# include <memory>
|
|
# include <ratio>
|
|
# include <stdexcept>
|
|
# include <tuple>
|
|
# include <type_traits>
|
|
# include <typeinfo>
|
|
# include <utility>
|
|
# include <variant>
|
|
#endif
|
|
|
|
#endif // _LIBCPP_OPTIONAL
|