4c9d1bdf94
Resolves #171275 - `*_assign_base` base class trivial overloads needed to be updated to allow references. - Add tests - Update release notes
114 lines
4.6 KiB
C++
114 lines
4.6 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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++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);
|
|
//
|
|
// Also test that std::optional<T&> is always trivially copyable.
|
|
|
|
#include <optional>
|
|
#include <type_traits>
|
|
|
|
#include "archetypes.h"
|
|
|
|
#include "test_macros.h"
|
|
|
|
|
|
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.");
|
|
|
|
#if TEST_STD_VER >= 26
|
|
static_assert(std::is_trivially_copyable_v<std::optional<T&>>);
|
|
static_assert(std::is_trivially_copy_constructible_v<std::optional<T&>>);
|
|
static_assert(std::is_trivially_move_constructible_v<std::optional<T&>>);
|
|
static_assert(std::is_trivially_constructible_v<std::optional<T&>, std::optional<T&>&>);
|
|
static_assert(std::is_trivially_constructible_v<std::optional<T&>, const std::optional<T&>&&>);
|
|
static_assert(std::is_trivially_copy_assignable_v<std::optional<T&>>);
|
|
static_assert(std::is_trivially_move_assignable_v<std::optional<T&>>);
|
|
static_assert(std::is_trivially_assignable_v<std::optional<T&>&, std::optional<T&>&>);
|
|
static_assert(std::is_trivially_assignable_v<std::optional<T&>&, const std::optional<T&>&&>);
|
|
static_assert(std::is_trivially_destructible_v<std::optional<T&>>);
|
|
#endif
|
|
};
|
|
|
|
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;
|
|
}
|