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98 lines
3.6 KiB
98 lines
3.6 KiB
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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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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