78 lines
2.2 KiB
C++
78 lines
2.2 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++03, c++11, c++14, c++17
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// UNSUPPORTED: libcpp-no-concepts
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// struct identity;
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#include <functional>
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#include <cassert>
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#include <concepts>
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#include "MoveOnly.h"
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static_assert(std::semiregular<std::identity>);
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static_assert(requires { typename std::identity::is_transparent; });
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constexpr bool test() {
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std::identity id;
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int i = 42;
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assert(id(i) == 42);
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assert(id(std::move(i)) == 42);
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MoveOnly m1 = 2;
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MoveOnly m2 = id(std::move(m1));
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assert(m2.get() == 2);
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assert(&id(i) == &i);
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static_assert(&id(id) == &id);
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const std::identity idc;
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assert(idc(1) == 1);
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assert(std::move(id)(1) == 1);
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assert(std::move(idc)(1) == 1);
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id = idc; // run-time checks assignment
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static_assert(std::is_same_v<decltype(id(i)), int&>);
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static_assert(std::is_same_v<decltype(id(std::declval<int&&>())), int&&>);
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static_assert(
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std::is_same_v<decltype(id(std::declval<int const&>())), int const&>);
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static_assert(
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std::is_same_v<decltype(id(std::declval<int const&&>())), int const&&>);
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static_assert(std::is_same_v<decltype(id(std::declval<int volatile&>())),
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int volatile&>);
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static_assert(std::is_same_v<decltype(id(std::declval<int volatile&&>())),
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int volatile&&>);
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static_assert(
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std::is_same_v<decltype(id(std::declval<int const volatile&>())),
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int const volatile&>);
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static_assert(
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std::is_same_v<decltype(id(std::declval<int const volatile&&>())),
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int const volatile&&>);
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struct S {
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constexpr S() = default;
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constexpr S(S&&) noexcept(false) {}
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constexpr S(S const&) noexcept(false) {}
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};
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S x;
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static_assert(noexcept(id(x)));
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static_assert(noexcept(id(S())));
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return true;
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}
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int main(int, char**) {
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test();
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static_assert(test());
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return 0;
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}
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