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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03
// <tuple>
// inline constexpr ignore-type ignore;
#include <cassert>
#include <cstdint>
#include <tuple>
#include <type_traits>
#include "test_macros.h"
static_assert(std::is_trivially_copyable<decltype(std::ignore)>::value, "");
static_assert(std::is_trivially_default_constructible<decltype(std::ignore)>::value, "");
#if TEST_STD_VER >= 17
[[nodiscard]] constexpr int test_nodiscard() { return 8294; }
#endif
TEST_CONSTEXPR_CXX14 bool test() {
{ [[maybe_unused]] auto& ignore_v = std::ignore; }
{ // Test that std::ignore provides converting assignment.
auto& res = (std::ignore = 42);
static_assert(noexcept(res = (std::ignore = 42)), "Must be noexcept");
assert(&res == &std::ignore);
}
{ // Test bit-field binding.
struct S {
unsigned int bf : 3;
};
S s{0b010};
auto& res = (std::ignore = s.bf);
assert(&res == &std::ignore);
}
{ // Test that std::ignore provides copy/move constructors
auto copy = std::ignore;
[[maybe_unused]] auto moved = std::move(copy);
}
{ // Test that std::ignore provides copy/move assignment
auto copy = std::ignore;
copy = std::ignore;
auto moved = std::ignore;
moved = std::move(copy);
}
#if TEST_STD_VER >= 17
{ std::ignore = test_nodiscard(); }
#endif
return true;
}
int main(int, char**) {
test();
#if TEST_STD_VER >= 14
static_assert(test(), "");
#endif
return 0;
}
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