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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
// <optional>
// The following special member functions should propagate the triviality of
// the element held in the optional (see P0602R4):
//
// constexpr optional(const optional& rhs);
// constexpr optional(optional&& rhs) noexcept(see below);
// constexpr optional<T>& operator=(const optional& rhs);
// constexpr optional<T>& operator=(optional&& rhs) noexcept(see below);
#include <optional>
#include <type_traits>
#include "archetypes.hpp"
constexpr bool implies(bool p, bool q) {
return !p || q;
}
template <class T>
struct SpecialMemberTest {
using O = std::optional<T>;
static_assert(implies(std::is_trivially_copy_constructible_v<T>,
std::is_trivially_copy_constructible_v<O>),
"optional<T> is trivially copy constructible if T is trivially copy constructible.");
static_assert(implies(std::is_trivially_move_constructible_v<T>,
std::is_trivially_move_constructible_v<O>),
"optional<T> is trivially move constructible if T is trivially move constructible");
static_assert(implies(std::is_trivially_copy_constructible_v<T> &&
std::is_trivially_copy_assignable_v<T> &&
std::is_trivially_destructible_v<T>,
std::is_trivially_copy_assignable_v<O>),
"optional<T> is trivially copy assignable if T is "
"trivially copy constructible, "
"trivially copy assignable, and "
"trivially destructible");
static_assert(implies(std::is_trivially_move_constructible_v<T> &&
std::is_trivially_move_assignable_v<T> &&
std::is_trivially_destructible_v<T>,
std::is_trivially_move_assignable_v<O>),
"optional<T> is trivially move assignable if T is "
"trivially move constructible, "
"trivially move assignable, and"
"trivially destructible.");
};
template <class ...Args> static void sink(Args&&...) {}
template <class ...TestTypes>
struct DoTestsMetafunction {
DoTestsMetafunction() { sink(SpecialMemberTest<TestTypes>{}...); }
};
struct TrivialMoveNonTrivialCopy {
TrivialMoveNonTrivialCopy() = default;
TrivialMoveNonTrivialCopy(const TrivialMoveNonTrivialCopy&) {}
TrivialMoveNonTrivialCopy(TrivialMoveNonTrivialCopy&&) = default;
TrivialMoveNonTrivialCopy& operator=(const TrivialMoveNonTrivialCopy&) { return *this; }
TrivialMoveNonTrivialCopy& operator=(TrivialMoveNonTrivialCopy&&) = default;
};
struct TrivialCopyNonTrivialMove {
TrivialCopyNonTrivialMove() = default;
TrivialCopyNonTrivialMove(const TrivialCopyNonTrivialMove&) = default;
TrivialCopyNonTrivialMove(TrivialCopyNonTrivialMove&&) {}
TrivialCopyNonTrivialMove& operator=(const TrivialCopyNonTrivialMove&) = default;
TrivialCopyNonTrivialMove& operator=(TrivialCopyNonTrivialMove&&) { return *this; }
};
int main(int, char**) {
sink(
ImplicitTypes::ApplyTypes<DoTestsMetafunction>{},
ExplicitTypes::ApplyTypes<DoTestsMetafunction>{},
NonLiteralTypes::ApplyTypes<DoTestsMetafunction>{},
NonTrivialTypes::ApplyTypes<DoTestsMetafunction>{},
DoTestsMetafunction<TrivialMoveNonTrivialCopy, TrivialCopyNonTrivialMove>{}
);
return 0;
}
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