forked from OSchip/llvm-project
66 lines
2.3 KiB
C++
66 lines
2.3 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++98, c++03, c++11, c++14
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// <optional>
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// Make sure we properly generate special member functions for optional<T>
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// based on the properties of T itself.
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#include <optional>
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#include <type_traits>
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#include "archetypes.h"
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#include "test_macros.h"
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template <class T>
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struct SpecialMemberTest {
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using O = std::optional<T>;
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static_assert(std::is_default_constructible_v<O>,
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"optional is always default constructible.");
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static_assert(std::is_copy_constructible_v<O> == std::is_copy_constructible_v<T>,
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"optional<T> is copy constructible if and only if T is copy constructible.");
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static_assert(std::is_move_constructible_v<O> ==
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(std::is_copy_constructible_v<T> || std::is_move_constructible_v<T>),
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"optional<T> is move constructible if and only if T is copy or move constructible.");
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static_assert(std::is_copy_assignable_v<O> ==
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(std::is_copy_constructible_v<T> && std::is_copy_assignable_v<T>),
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"optional<T> is copy assignable if and only if T is both copy "
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"constructible and copy assignable.");
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static_assert(std::is_move_assignable_v<O> ==
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((std::is_move_constructible_v<T> && std::is_move_assignable_v<T>) ||
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(std::is_copy_constructible_v<T> && std::is_copy_assignable_v<T>)),
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"optional<T> is move assignable if and only if T is both move constructible and "
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"move assignable, or both copy constructible and copy assignable.");
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};
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template <class ...Args> static void sink(Args&&...) {}
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template <class ...TestTypes>
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struct DoTestsMetafunction {
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DoTestsMetafunction() { sink(SpecialMemberTest<TestTypes>{}...); }
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};
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int main(int, char**) {
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sink(
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ImplicitTypes::ApplyTypes<DoTestsMetafunction>{},
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ExplicitTypes::ApplyTypes<DoTestsMetafunction>{},
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NonLiteralTypes::ApplyTypes<DoTestsMetafunction>{},
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NonTrivialTypes::ApplyTypes<DoTestsMetafunction>{}
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);
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return 0;
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}
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