forked from mirror/libcxx
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
64 lines
2.2 KiB
C++
64 lines
2.2 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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>{}
|
|
);
|
|
}
|