129 lines
3.0 KiB
C++
129 lines
3.0 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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//
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// UNSUPPORTED: libcpp-has-no-threads
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// UNSUPPORTED: c++03
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// <future>
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// class promise<R>
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// ~promise();
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#include <future>
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#include <cassert>
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#include "test_macros.h"
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int main(int, char**)
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{
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{
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typedef int T;
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std::future<T> f;
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{
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std::promise<T> p;
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f = p.get_future();
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p.set_value(3);
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}
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assert(f.get() == 3);
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}
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#ifndef TEST_HAS_NO_EXCEPTIONS
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{
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typedef int T;
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std::future<T> f;
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{
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std::promise<T> p;
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f = p.get_future();
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}
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try
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{
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T i = f.get();
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((void)i); // Prevent unused warning
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assert(false);
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}
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catch (const std::future_error& e)
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{
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assert(e.code() == make_error_code(std::future_errc::broken_promise));
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}
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}
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#endif
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{
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typedef int& T;
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int i = 4;
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std::future<T> f;
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{
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std::promise<T> p;
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f = p.get_future();
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p.set_value(i);
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}
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assert(&f.get() == &i);
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}
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#ifndef TEST_HAS_NO_EXCEPTIONS
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{
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typedef int& T;
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std::future<T> f;
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{
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std::promise<T> p;
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f = p.get_future();
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}
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try
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{
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T i = f.get();
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((void)i); // Prevent unused warning
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assert(false);
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}
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catch (const std::future_error& e)
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{
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assert(e.code() == make_error_code(std::future_errc::broken_promise));
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}
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}
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#endif
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{
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typedef void T;
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std::future<T> f;
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{
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std::promise<T> p;
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f = p.get_future();
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p.set_value();
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}
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f.get();
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assert(true);
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}
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#ifndef TEST_HAS_NO_EXCEPTIONS
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{
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typedef void T;
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std::future<T> f;
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{
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std::promise<T> p;
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f = p.get_future();
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}
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try
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{
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f.get();
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assert(false);
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}
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catch (const std::future_error& e)
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{
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// LWG 2056 changed the values of future_errc, so if we're using new
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// headers with an old library the error codes won't line up.
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//
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// Note that this particular check only applies to promise<void>
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// since the other specializations happen to be implemented in the
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// header rather than the library.
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assert(
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e.code() == make_error_code(std::future_errc::broken_promise) ||
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e.code() == std::error_code(0, std::future_category()));
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}
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}
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#endif
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return 0;
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}
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