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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: no-threads
// VC Runtime's std::exception::what() method is not marked as noexcept, so
// this fails.
// UNSUPPORTED: target=x86_64-pc-windows-msvc
// <future>
//
// class future_error
//
// const char* what() const noexcept;
#include <cassert>
#include <future>
#include <string_view>
#include <utility>
#include "test_macros.h"
int main(int, char**) {
ASSERT_NOEXCEPT(std::declval<std::future_error const&>().what());
ASSERT_SAME_TYPE(decltype(std::declval<std::future_error const&>().what()), char const*);
// Before C++17, we can't construct std::future_error directly in a standards-conforming way
#if TEST_STD_VER >= 17
{
std::future_error const f(std::future_errc::broken_promise);
[[maybe_unused]] char const* what = f.what();
LIBCPP_ASSERT(what == std::string_view{"The associated promise has been destructed prior "
"to the associated state becoming ready."});
}
{
std::future_error f(std::future_errc::future_already_retrieved);
[[maybe_unused]] char const* what = f.what();
LIBCPP_ASSERT(what == std::string_view{"The future has already been retrieved from "
"the promise or packaged_task."});
}
{
std::future_error f(std::future_errc::promise_already_satisfied);
[[maybe_unused]] char const* what = f.what();
LIBCPP_ASSERT(what == std::string_view{"The state of the promise has already been set."});
}
{
std::future_error f(std::future_errc::no_state);
[[maybe_unused]] char const* what = f.what();
LIBCPP_ASSERT(what == std::string_view{"Operation not permitted on an object without "
"an associated state."});
}
#endif
return 0;
}
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