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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: libcpp-has-no-threads
// UNSUPPORTED: c++98, c++03
// <future>
// class promise<R>
// ~promise();
#include <future>
#include <cassert>
#include "test_macros.h"
int main(int, char**)
{
{
typedef int T;
std::future<T> f;
{
std::promise<T> p;
f = p.get_future();
p.set_value(3);
}
assert(f.get() == 3);
}
#ifndef TEST_HAS_NO_EXCEPTIONS
{
typedef int T;
std::future<T> f;
{
std::promise<T> p;
f = p.get_future();
}
try
{
T i = f.get();
((void)i); // Prevent unused warning
assert(false);
}
catch (const std::future_error& e)
{
assert(e.code() == make_error_code(std::future_errc::broken_promise));
}
}
#endif
{
typedef int& T;
int i = 4;
std::future<T> f;
{
std::promise<T> p;
f = p.get_future();
p.set_value(i);
}
assert(&f.get() == &i);
}
#ifndef TEST_HAS_NO_EXCEPTIONS
{
typedef int& T;
std::future<T> f;
{
std::promise<T> p;
f = p.get_future();
}
try
{
T i = f.get();
((void)i); // Prevent unused warning
assert(false);
}
catch (const std::future_error& e)
{
assert(e.code() == make_error_code(std::future_errc::broken_promise));
}
}
#endif
{
typedef void T;
std::future<T> f;
{
std::promise<T> p;
f = p.get_future();
p.set_value();
}
f.get();
assert(true);
}
#ifndef TEST_HAS_NO_EXCEPTIONS
{
typedef void T;
std::future<T> f;
{
std::promise<T> p;
f = p.get_future();
}
try
{
f.get();
assert(false);
}
catch (const std::future_error& e)
{
// LWG 2056 changed the values of future_errc, so if we're using new
// headers with an old library the error codes won't line up.
//
// Note that this particular check only applies to promise<void>
// since the other specializations happen to be implemented in the
// header rather than the library.
assert(
e.code() == make_error_code(std::future_errc::broken_promise) ||
e.code() == std::error_code(0, std::future_category()));
}
}
#endif
return 0;
}
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