cfc219ae68
There are currently no tests for [concepts.compare], but they will be added ASAP. * include/Makefile.am: Add new header. * include/Makefile.in: Regenerate. * include/precompiled/stdc++.h: Include <concepts>. * include/std/concepts: New header for C++20. * include/std/version (__cpp_lib_concepts): Define. * scripts/create_testsuite_files: Look for test files in new std directory. * testsuite/libstdc++-dg/conformance.exp: Likewise. * testsuite/std/concepts/concepts.callable/invocable.cc: New test. * testsuite/std/concepts/concepts.callable/regular_invocable.cc: New test. * testsuite/std/concepts/concepts.callable/relation.cc: New test. * testsuite/std/concepts/concepts.callable/strictweakorder.cc: New test. * testsuite/std/concepts/concepts.lang/concept.arithmetic/ floating_point.cc: New test. * testsuite/std/concepts/concepts.lang/concept.arithmetic/integral.cc: New test. * testsuite/std/concepts/concepts.lang/concept.arithmetic/ signed_integral.cc: New test. * testsuite/std/concepts/concepts.lang/concept.arithmetic/ unsigned_integral.cc: New test. * testsuite/std/concepts/concepts.lang/concept.assignable/1.cc: New test. * testsuite/std/concepts/concepts.lang/concept.common/1.cc: New test. * testsuite/std/concepts/concepts.lang/concept.commonref/1.cc: New test. * testsuite/std/concepts/concepts.lang/concept.constructible/1.cc: New test. * testsuite/std/concepts/concepts.lang/concept.convertible/1.cc: New test. * testsuite/std/concepts/concepts.lang/concept.copyconstructible/1.cc: New test. * testsuite/std/concepts/concepts.lang/concept.defaultconstructible/ 1.cc: New test. * testsuite/std/concepts/concepts.lang/concept.derived/1.cc: New test. * testsuite/std/concepts/concepts.lang/concept.destructible/1.cc: New test. * testsuite/std/concepts/concepts.lang/concept.moveconstructible/1.cc: New test. * testsuite/std/concepts/concepts.lang/concept.same/1.cc: New test. * testsuite/std/concepts/concepts.lang/concept.swappable/swap.cc: New test. * testsuite/std/concepts/concepts.lang/concept.swappable/swappable.cc: New test. * testsuite/std/concepts/concepts.lang/concept.swappable/ swappable_with.cc: New test. * testsuite/std/concepts/concepts.object/copyable.cc: New test. * testsuite/std/concepts/concepts.object/movable.cc: New test. * testsuite/std/concepts/concepts.object/regular.cc: New test. * testsuite/std/concepts/concepts.object/semiregular.cc: New test. From-SVN: r276892
352 lines
12 KiB
C++
352 lines
12 KiB
C++
// <concepts> -*- C++ -*-
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// Copyright (C) 2019 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received __a copy of the GNU General Public License and
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// __a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file include/concepts
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* This is __a Standard C++ Library header.
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* @ingroup concepts
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*/
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#ifndef _GLIBCXX_CONCEPTS
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#define _GLIBCXX_CONCEPTS 1
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#if __cplusplus > 201703L && __cpp_concepts
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#pragma GCC system_header
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/**
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* @defgroup concepts Concepts
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* @ingroup utilities
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*
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* Concepts for checking type requirements.
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*/
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#include <type_traits>
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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#define __cpp_lib_concepts 201806L
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// [concepts.lang], language-related concepts
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namespace __detail
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{
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template<typename _Tp, typename _Up>
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concept __same_as = __is_same_as(_Tp, _Up);
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} // namespace __detail
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/// [concept.same], concept same_as
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template<typename _Tp, typename _Up>
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concept same_as
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= __detail::__same_as<_Tp, _Up> && __detail::__same_as<_Up, _Tp>;
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/// [concept.derived], concept derived_from
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template<typename _Derived, typename _Base>
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concept derived_from = __is_base_of(_Base, _Derived)
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&& is_convertible_v<const volatile _Derived*, const volatile _Base*>;
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/// [concept.convertible], concept convertible_to
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template<typename _From, typename _To>
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concept convertible_to = is_convertible_v<_From, _To>
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&& requires(add_rvalue_reference_t<_From> (&__f)()) {
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static_cast<_To>(__f());
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};
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/// [concept.commonref], concept common_reference_with
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template<typename _Tp, typename _Up>
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concept common_reference_with
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= same_as<common_reference_t<_Tp, _Up>, common_reference_t<_Up, _Tp>>
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&& convertible_to<_Tp, common_reference_t<_Tp, _Up>>
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&& convertible_to<_Up, common_reference_t<_Tp, _Up>>;
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/// [concept.common], concept common_with
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template<typename _Tp, typename _Up>
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concept common_with
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= same_as<common_type_t<_Tp, _Up>, common_type_t<_Up, _Tp>>
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&& requires {
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static_cast<common_type_t<_Tp, _Up>>(std::declval<_Tp>());
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static_cast<common_type_t<_Tp, _Up>>(std::declval<_Up>());
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}
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&& common_reference_with<add_lvalue_reference_t<const _Tp>,
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add_lvalue_reference_t<const _Up>>
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&& common_reference_with<add_lvalue_reference_t<common_type_t<_Tp, _Up>>,
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common_reference_t<
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add_lvalue_reference_t<const _Tp>,
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add_lvalue_reference_t<const _Up>>>;
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// [concepts.arithmetic], arithmetic concepts
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template<typename _Tp>
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concept integral = is_integral_v<_Tp>;
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template<typename _Tp>
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concept signed_integral = integral<_Tp> && is_signed_v<_Tp>;
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template<typename _Tp>
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concept unsigned_integral = integral<_Tp> && !signed_integral<_Tp>;
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template<typename _Tp>
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concept floating_point = is_floating_point_v<_Tp>;
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namespace __detail
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{
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template<typename _Tp>
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using __cref = const remove_reference_t<_Tp>&;
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} // namespace __detail
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/// [concept.assignable], concept assignable_from
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template<typename _Lhs, typename _Rhs>
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concept assignable_from
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= is_lvalue_reference_v<_Lhs>
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&& common_reference_with<__detail::__cref<_Lhs>, __detail::__cref<_Rhs>>
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&& requires(_Lhs __lhs, _Rhs&& __rhs) {
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{ __lhs = static_cast<_Rhs&&>(__rhs) } -> same_as<_Lhs>;
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};
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/// [concept.destructible], concept destructible
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template<typename _Tp>
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concept destructible = is_nothrow_destructible_v<_Tp>;
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/// [concept.constructible], concept constructible_from
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template<typename _Tp, typename... _Args>
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concept constructible_from
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= destructible<_Tp> && is_constructible_v<_Tp, _Args...>;
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/// [concept.defaultconstructible], concept default_constructible
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template<typename _Tp>
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concept default_constructible = constructible_from<_Tp>;
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/// [concept.moveconstructible], concept move_constructible
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template<typename _Tp>
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concept move_constructible
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= constructible_from<_Tp, _Tp> && convertible_to<_Tp, _Tp>;
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/// [concept.copyconstructible], concept copy_constructible
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template<typename _Tp>
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concept copy_constructible
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= move_constructible<_Tp>
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&& constructible_from<_Tp, _Tp&> && convertible_to<_Tp&, _Tp>
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&& constructible_from<_Tp, const _Tp&> && convertible_to<const _Tp&, _Tp>
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&& constructible_from<_Tp, const _Tp> && convertible_to<const _Tp, _Tp>;
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// [concept.swappable], concept swappable
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namespace ranges
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{
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namespace __cust_swap
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{
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template<typename _Tp> void swap(_Tp&, _Tp&) = delete;
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template<typename _Tp>
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concept __class_or_enum
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= is_class_v<_Tp> || is_union_v<_Tp> || is_enum_v<_Tp>;
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template<typename _Tp, typename _Up>
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concept __adl_swap
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= (__class_or_enum<remove_cvref_t<_Tp>>
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|| __class_or_enum<remove_cvref_t<_Up>>)
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&& requires(_Tp&& __t, _Up&& __u) {
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swap(static_cast<_Tp&&>(__t), static_cast<_Up&&>(__u));
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};
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struct _Swap
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{
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template<typename _Tp, typename _Up>
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requires __adl_swap<_Tp, _Up>
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constexpr void operator()(_Tp&& __t, _Up&& __u) const
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noexcept(noexcept(swap(std::declval<_Tp>(), std::declval<_Up>())))
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{ swap(static_cast<_Tp&&>(__t), static_cast<_Up&&>(__u)); }
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template<typename _Tp, typename _Up, size_t _Num>
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requires requires(const _Swap& __swap, _Tp& __e1, _Up& __e2) {
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__swap(__e1, __e2);
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}
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constexpr void
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operator()(_Tp (&__e1)[_Num], _Up (&__e2)[_Num]) const
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noexcept(noexcept(std::declval<const _Swap&>()(*__e1, *__e2)))
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{
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for (size_t __n = 0; __n < _Num; ++__n)
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(*this)(__e1[__n], __e2[__n]);
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}
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template<typename _Tp>
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requires (!__adl_swap<_Tp&, _Tp&>
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&& move_constructible<_Tp> && assignable_from<_Tp&, _Tp>)
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constexpr void
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operator()(_Tp& __e1, _Tp& __e2) const
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noexcept(is_nothrow_move_constructible_v<_Tp>
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&& is_nothrow_move_assignable_v<_Tp>)
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{
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_Tp __tmp = static_cast<_Tp&&>(__e1);
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__e1 = static_cast<_Tp&&>(__e2);
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__e2 = static_cast<_Tp&&>(__tmp);
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}
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};
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} // namespace __cust_swap
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inline namespace __cust
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{
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inline constexpr __cust_swap::_Swap swap{};
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} // inline namespace __cust
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} // namespace ranges
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template<typename _Tp>
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concept swappable
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= requires(_Tp& __a, _Tp& __b) { ranges::swap(__a, __b); };
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template<typename _Tp, typename _Up>
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concept swappable_with = common_reference_with<_Tp, _Up>
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&& requires(_Tp&& __t, _Up&& __u) {
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ranges::swap(static_cast<_Tp&&>(__t), static_cast<_Tp&&>(__t));
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ranges::swap(static_cast<_Up&&>(__u), static_cast<_Up&&>(__u));
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ranges::swap(static_cast<_Tp&&>(__t), static_cast<_Up&&>(__u));
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ranges::swap(static_cast<_Up&&>(__u), static_cast<_Tp&&>(__t));
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};
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// [concepts.object], Object concepts
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template<typename _Tp>
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concept movable = is_object_v<_Tp> && move_constructible<_Tp>
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&& assignable_from<_Tp&, _Tp> && swappable<_Tp>;
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template<typename _Tp>
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concept copyable = copy_constructible<_Tp> && movable<_Tp>
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&& assignable_from<_Tp&, const _Tp&>;
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template<typename _Tp>
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concept semiregular = copyable<_Tp> && default_constructible<_Tp>;
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// [concepts.compare], comparison concepts
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/// [concept.boolean], concept boolean
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template<typename _Bp>
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concept boolean
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= movable<remove_cvref_t<_Bp>>
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&& requires(__detail::__cref<_Bp> __b1, __detail::__cref<_Bp> __b2,
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const bool __a) {
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{ __b1 } -> convertible_to<bool>;
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{ !__b1 } -> convertible_to<bool>;
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{ __b1 && __b2 } -> same_as<bool>;
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{ __b1 && __a } -> same_as<bool>;
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{ __a && __b2 } -> same_as<bool>;
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{ __b1 || __b2 } -> same_as<bool>;
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{ __b1 || __a } -> same_as<bool>;
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{ __a || __b2 } -> same_as<bool>;
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{ __b1 == __b2 } -> convertible_to<bool>;
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{ __b1 == __a } -> convertible_to<bool>;
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{ __a == __b2 } -> convertible_to<bool>;
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{ __b1 != __b2 } -> convertible_to<bool>;
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{ __b1 != __a } -> convertible_to<bool>;
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{ __a != __b2 } -> convertible_to<bool>;
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};
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// [concept.equalitycomparable], concept equality_comparable
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namespace __detail
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{
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template<typename _Tp, typename _Up>
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concept __weakly_eq_cmp_with
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= requires(__detail::__cref<_Tp> __t, __detail::__cref<_Up> __u) {
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{ __t == __u } -> boolean;
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{ __t != __u } -> boolean;
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{ __u == __t } -> boolean;
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{ __u != __t } -> boolean;
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};
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} // namespace __detail
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template<typename _Tp>
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concept equality_comparable = __detail::__weakly_eq_cmp_with<_Tp, _Tp>;
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template<typename _Tp, typename _Up>
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concept equality_comparable_with
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= equality_comparable<_Tp> && equality_comparable<_Up>
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&& common_reference_with<__detail::__cref<_Tp>, __detail::__cref<_Up>>
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&& equality_comparable<common_reference_t<__detail::__cref<_Tp>,
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__detail::__cref<_Up>>>
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&& __detail::__weakly_eq_cmp_with<_Tp, _Up>;
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// [concept.totallyordered], concept totally_ordered
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template<typename _Tp>
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concept totally_ordered
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= equality_comparable<_Tp>
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&& requires(__detail::__cref<_Tp> __a, __detail::__cref<_Tp> __b) {
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{ __a < __b } -> boolean;
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{ __a > __b } -> boolean;
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{ __a <= __b } -> boolean;
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{ __a >= __b } -> boolean;
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};
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template<typename _Tp, typename _Up>
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concept totally_ordered_with
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= totally_ordered<_Tp> && totally_ordered<_Up>
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&& common_reference_with<__detail::__cref<_Tp>, __detail::__cref<_Up>>
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&& totally_ordered<common_reference_t<__detail::__cref<_Tp>,
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__detail::__cref<_Up>>>
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&& equality_comparable_with<_Tp, _Up>
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&& requires(__detail::__cref<_Tp> __t, __detail::__cref<_Up> __u) {
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{ __t < __u } -> boolean;
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{ __t > __u } -> boolean;
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{ __t <= __u } -> boolean;
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{ __t >= __u } -> boolean;
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{ __u < __t } -> boolean;
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{ __u > __t } -> boolean;
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{ __u <= __t } -> boolean;
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{ __u >= __t } -> boolean;
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};
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template<typename _Tp>
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concept regular = semiregular<_Tp> && equality_comparable<_Tp>;
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// [concepts.callable], callable concepts
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// [concept.invocable], concept invocable
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template<typename _Fn, typename... _Args>
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concept invocable = is_invocable_v<_Fn, _Args...>;
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// [concept.regularinvocable], concept regular_invocable
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template<typename _Fn, typename... _Args>
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concept regular_invocable = invocable<_Fn, _Args...>;
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// [concept.predicate], concept predicate
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template<typename _Fn, typename... _Args>
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concept predicate = regular_invocable<_Fn, _Args...>
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&& boolean<invoke_result_t<_Fn, _Args...>>;
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// [concept.relation], concept relation
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template<typename _Rel, typename _Tp, typename _Up>
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concept relation
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= predicate<_Rel, _Tp, _Tp> && predicate<_Rel, _Up, _Up>
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&& predicate<_Rel, _Tp, _Up> && predicate<_Rel, _Up, _Tp>;
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// [concept.strictweakorder], concept strict_weak_order
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template<typename _Rel, typename _Tp, typename _Up>
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concept strict_weak_order = relation<_Rel, _Tp, _Up>;
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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#endif // C++2a
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#endif /* _GLIBCXX_CONCEPTS */
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