cxx/test/thread/futures/futures.promise/dtor.pass.cpp

//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// <future>

// class promise<R>

// ~promise();

#include <future>
#include <cassert>

int main()
{
    {
        typedef int T;
        std::future<T> f;
        {
            std::promise<T> p;
            f = p.get_future();
            p.set_value(3);
        }
        assert(f.get() == 3);
    }
    {
        typedef int T;
        std::future<T> f;
        {
            std::promise<T> p;
            f = p.get_future();
        }
        try
        {
            T i = f.get();
            assert(false);
        }
        catch (const std::future_error& e)
        {
            assert(e.code() == make_error_code(std::future_errc::broken_promise));
        }
    }

    {
        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);
    }
    {
        typedef int& T;
        std::future<T> f;
        {
            std::promise<T> p;
            f = p.get_future();
        }
        try
        {
            T i = f.get();
            assert(false);
        }
        catch (const std::future_error& e)
        {
            assert(e.code() == make_error_code(std::future_errc::broken_promise));
        }
    }

    {
        typedef void T;
        std::future<T> f;
        {
            std::promise<T> p;
            f = p.get_future();
            p.set_value();
        }
        f.get();
        assert(true);
    }
    {
        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)
        {
            assert(e.code() == make_error_code(std::future_errc::broken_promise));
        }
    }
}