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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03, c++11, c++14
// <optional>
#include <optional>
#include <type_traits>
#include <cassert>
#include "archetypes.hpp"
template <class T>
struct SpecialMemberTest {
using O = std::optional<T>;
static_assert(std::is_default_constructible_v<O>,
"optional is always default constructible.");
static_assert(std::is_copy_constructible_v<O> == std::is_copy_constructible_v<T>,
"optional<T> is copy constructible if and only if T is copy constructible.");
static_assert(std::is_move_constructible_v<O> ==
(std::is_copy_constructible_v<T> || std::is_move_constructible_v<T>),
"optional<T> is move constructible if and only if T is copy or move constructible.");
static_assert(std::is_copy_assignable_v<O> ==
(std::is_copy_constructible_v<T> && std::is_copy_assignable_v<T>),
"optional<T> is copy assignable if and only if T is both copy "
"constructible and copy assignable.");
static_assert(std::is_move_assignable_v<O> ==
((std::is_move_constructible_v<T> && std::is_move_assignable_v<T>) ||
(std::is_copy_constructible_v<T> && std::is_copy_assignable_v<T>)),
"optional<T> is move assignable if and only if T is both move constructible and "
"move assignable, or both copy constructible and copy assignable.");
// The following tests are for not-yet-standardized behavior (P0602):
static_assert(std::is_trivially_destructible_v<O> ==
std::is_trivially_destructible_v<T>,
"optional<T> is trivially destructible if and only if T is.");
static_assert(std::is_trivially_copy_constructible_v<O> ==
std::is_trivially_copy_constructible_v<T>,
"optional<T> is trivially copy constructible if and only if T is.");
static_assert(std::is_trivially_move_constructible_v<O> ==
std::is_trivially_move_constructible_v<T> ||
(!std::is_move_constructible_v<T> && std::is_trivially_copy_constructible_v<T>),
"optional<T> is trivially move constructible if T is trivially move constructible, "
"or if T is trivially copy constructible and is not move constructible.");
static_assert(std::is_trivially_copy_assignable_v<O> ==
(std::is_trivially_destructible_v<T> &&
std::is_trivially_copy_constructible_v<T> &&
std::is_trivially_copy_assignable_v<T>),
"optional<T> is trivially copy assignable if and only if T is trivially destructible, "
"trivially copy constructible, and trivially copy assignable.");
static_assert(std::is_trivially_move_assignable_v<O> ==
(std::is_trivially_destructible_v<T> &&
((std::is_trivially_move_constructible_v<T> && std::is_trivially_move_assignable_v<T>) ||
((!std::is_move_constructible_v<T> || !std::is_move_assignable_v<T>) &&
std::is_trivially_copy_constructible_v<T> && std::is_trivially_copy_assignable_v<T>))),
"optional<T> is trivially move assignable if T is trivially destructible, and either "
"(1) trivially move constructible and trivially move assignable, or "
"(2) not move constructible or not move assignable, and "
"trivially copy constructible and trivially copy assignable.");
};
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()
{
sink(
ImplicitTypes::ApplyTypes<DoTestsMetafunction>{},
ExplicitTypes::ApplyTypes<DoTestsMetafunction>{},
NonLiteralTypes::ApplyTypes<DoTestsMetafunction>{},
NonTrivialTypes::ApplyTypes<DoTestsMetafunction>{},
DoTestsMetafunction<TrivialMoveNonTrivialCopy, TrivialCopyNonTrivialMove>{}
);
}
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