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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>
// Make sure we properly generate special member functions for optional<T>
// based on the properties of T itself.
#include <optional>
#include <type_traits>
#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.");
};
template <class ...Args> static void sink(Args&&...) {}
template <class ...TestTypes>
struct DoTestsMetafunction {
DoTestsMetafunction() { sink(SpecialMemberTest<TestTypes>{}...); }
};
int main() {
sink(
ImplicitTypes::ApplyTypes<DoTestsMetafunction>{},
ExplicitTypes::ApplyTypes<DoTestsMetafunction>{},
NonLiteralTypes::ApplyTypes<DoTestsMetafunction>{},
NonTrivialTypes::ApplyTypes<DoTestsMetafunction>{}
);
}
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