54 lines
1.3 KiB
C++
54 lines
1.3 KiB
C++
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//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <future>
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// class promise<R>
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// future<R> get_future();
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#include <future>
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#include <cassert>
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int main()
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{
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{
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std::promise<double> p;
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std::future<double> f = p.get_future();
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p.set_value(105.5);
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assert(f.get() == 105.5);
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}
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{
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std::promise<double> p;
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std::future<double> f = p.get_future();
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try
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{
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f = p.get_future();
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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::future_already_retrieved));
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}
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}
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{
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std::promise<double> p;
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std::promise<double> p0 = std::move(p);
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try
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{
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std::future<double> f = p.get_future();
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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::no_state));
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}
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}
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}
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