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50 lines
1.1 KiB
C++
50 lines
1.1 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++98, c++03
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// <future>
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// class promise<R>
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// void promise<R&>::set_value(R& r);
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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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int i = 3;
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std::promise<T> p;
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std::future<T> f = p.get_future();
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p.set_value(i);
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int& j = f.get();
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assert(j == 3);
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++i;
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assert(j == 4);
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#ifndef TEST_HAS_NO_EXCEPTIONS
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try
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{
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p.set_value(i);
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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::promise_already_satisfied));
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}
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#endif
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}
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return 0;
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}
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