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7c3769df62
to reflect the new license. These used slightly different spellings that defeated my regular expressions. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@351648 91177308-0d34-0410-b5e6-96231b3b80d8
97 lines
3.6 KiB
C++
97 lines
3.6 KiB
C++
//===----------------------------------------------------------------------===//
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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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// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
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// <optional>
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// The following special member functions should propagate the triviality of
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// the element held in the optional (see P0602R4):
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//
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// constexpr optional(const optional& rhs);
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// constexpr optional(optional&& rhs) noexcept(see below);
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// constexpr optional<T>& operator=(const optional& rhs);
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// constexpr optional<T>& operator=(optional&& rhs) noexcept(see below);
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#include <optional>
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#include <type_traits>
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#include "archetypes.hpp"
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constexpr bool implies(bool p, bool q) {
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return !p || q;
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}
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template <class T>
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struct SpecialMemberTest {
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using O = std::optional<T>;
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static_assert(implies(std::is_trivially_copy_constructible_v<T>,
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std::is_trivially_copy_constructible_v<O>),
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"optional<T> is trivially copy constructible if T is trivially copy constructible.");
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static_assert(implies(std::is_trivially_move_constructible_v<T>,
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std::is_trivially_move_constructible_v<O>),
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"optional<T> is trivially move constructible if T is trivially move constructible");
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static_assert(implies(std::is_trivially_copy_constructible_v<T> &&
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std::is_trivially_copy_assignable_v<T> &&
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std::is_trivially_destructible_v<T>,
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std::is_trivially_copy_assignable_v<O>),
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"optional<T> is trivially copy assignable if T is "
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"trivially copy constructible, "
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"trivially copy assignable, and "
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"trivially destructible");
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static_assert(implies(std::is_trivially_move_constructible_v<T> &&
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std::is_trivially_move_assignable_v<T> &&
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std::is_trivially_destructible_v<T>,
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std::is_trivially_move_assignable_v<O>),
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"optional<T> is trivially move assignable if T is "
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"trivially move constructible, "
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"trivially move assignable, and"
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"trivially destructible.");
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};
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template <class ...Args> static void sink(Args&&...) {}
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template <class ...TestTypes>
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struct DoTestsMetafunction {
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DoTestsMetafunction() { sink(SpecialMemberTest<TestTypes>{}...); }
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};
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struct TrivialMoveNonTrivialCopy {
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TrivialMoveNonTrivialCopy() = default;
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TrivialMoveNonTrivialCopy(const TrivialMoveNonTrivialCopy&) {}
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TrivialMoveNonTrivialCopy(TrivialMoveNonTrivialCopy&&) = default;
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TrivialMoveNonTrivialCopy& operator=(const TrivialMoveNonTrivialCopy&) { return *this; }
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TrivialMoveNonTrivialCopy& operator=(TrivialMoveNonTrivialCopy&&) = default;
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};
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struct TrivialCopyNonTrivialMove {
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TrivialCopyNonTrivialMove() = default;
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TrivialCopyNonTrivialMove(const TrivialCopyNonTrivialMove&) = default;
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TrivialCopyNonTrivialMove(TrivialCopyNonTrivialMove&&) {}
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TrivialCopyNonTrivialMove& operator=(const TrivialCopyNonTrivialMove&) = default;
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TrivialCopyNonTrivialMove& operator=(TrivialCopyNonTrivialMove&&) { return *this; }
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};
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int main() {
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sink(
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ImplicitTypes::ApplyTypes<DoTestsMetafunction>{},
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ExplicitTypes::ApplyTypes<DoTestsMetafunction>{},
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NonLiteralTypes::ApplyTypes<DoTestsMetafunction>{},
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NonTrivialTypes::ApplyTypes<DoTestsMetafunction>{},
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DoTestsMetafunction<TrivialMoveNonTrivialCopy, TrivialCopyNonTrivialMove>{}
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);
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}
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