134 lines
3.3 KiB
C++
134 lines
3.3 KiB
C++
// Copyright (C) 2012-2013 Vicente Botet
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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// <boost/thread/future.hpp>
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// class future<R>
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// template<typename F>
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// auto then(F&& func) -> future<decltype(func(*this))>;
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#define BOOST_THREAD_VERSION 4
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//#define BOOST_THREAD_USES_LOG
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#define BOOST_THREAD_USES_LOG_THREAD_ID
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#include <boost/thread/detail/log.hpp>
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#include <boost/thread/future.hpp>
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#include <boost/detail/lightweight_test.hpp>
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#if defined BOOST_THREAD_PROVIDES_FUTURE_CONTINUATION
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#ifdef BOOST_MSVC
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#pragma warning(disable: 4127) // conditional expression is constant
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#endif
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int p1()
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{
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BOOST_THREAD_LOG << "p1 < " << BOOST_THREAD_END_LOG;
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boost::this_thread::sleep_for(boost::chrono::milliseconds(500));
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BOOST_THREAD_LOG << "p1 >" << BOOST_THREAD_END_LOG;
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return 1;
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}
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int p2(boost::future<int> f)
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{
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BOOST_THREAD_LOG << "p2 <" << &f << BOOST_THREAD_END_LOG;
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BOOST_TEST(f.valid());
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int i = f.get();
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boost::this_thread::sleep_for(boost::chrono::milliseconds(500));
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BOOST_THREAD_LOG << "p2 <" << &f << BOOST_THREAD_END_LOG;
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return 2 * i;
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}
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void p3(boost::future<int> f)
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{
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BOOST_THREAD_LOG << "p3 <" << &f << BOOST_THREAD_END_LOG;
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BOOST_TEST(f.valid());
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int i = f.get();
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boost::this_thread::sleep_for(boost::chrono::milliseconds(500));
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BOOST_THREAD_LOG << "p3 <" << &f << " " <<i << BOOST_THREAD_END_LOG;
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return;
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}
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int main()
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{
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BOOST_THREAD_LOG << BOOST_THREAD_END_LOG;
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{
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boost::future<int> f1 = boost::async(boost::launch::async, &p1);
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BOOST_TEST(f1.valid());
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boost::future<int> f2 = f1.then(&p2);
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BOOST_TEST(f2.valid());
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BOOST_TEST(! f1.valid());
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try
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{
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BOOST_TEST(f2.get()==2);
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}
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catch (std::exception& ex)
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{
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BOOST_THREAD_LOG << "ERRORRRRR "<<ex.what() << "" << BOOST_THREAD_END_LOG;
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BOOST_TEST(false);
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}
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catch (...)
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{
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BOOST_THREAD_LOG << " ERRORRRRR exception thrown" << BOOST_THREAD_END_LOG;
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BOOST_TEST(false);
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}
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}
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BOOST_THREAD_LOG << BOOST_THREAD_END_LOG;
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{
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boost::future<int> f1 = boost::async(boost::launch::async, &p1);
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BOOST_TEST(f1.valid());
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boost::future<void> f2 = f1.then(&p3);
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BOOST_TEST(f2.valid());
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try
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{
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f2.wait();
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}
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catch (std::exception& ex)
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{
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BOOST_THREAD_LOG << "ERRORRRRR "<<ex.what() << "" << BOOST_THREAD_END_LOG;
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BOOST_TEST(false);
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}
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catch (...)
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{
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BOOST_THREAD_LOG << " ERRORRRRR exception thrown" << BOOST_THREAD_END_LOG;
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BOOST_TEST(false);
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}
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}
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BOOST_THREAD_LOG << BOOST_THREAD_END_LOG;
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{
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boost::future<int> f2 = boost::async(p1).then(&p2);
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BOOST_TEST(f2.get()==2);
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}
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BOOST_THREAD_LOG << BOOST_THREAD_END_LOG;
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{
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boost::future<int> f1 = boost::async(p1);
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boost::future<int> f21 = f1.then(&p2);
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boost::future<int> f2= f21.then(&p2);
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BOOST_TEST(f2.get()==4);
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}
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BOOST_THREAD_LOG << BOOST_THREAD_END_LOG;
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{
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boost::future<int> f1 = boost::async(p1);
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boost::future<int> f2= f1.then(&p2).then(&p2);
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BOOST_TEST(f2.get()==4);
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}
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BOOST_THREAD_LOG << BOOST_THREAD_END_LOG;
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{
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boost::future<int> f2 = boost::async(p1).then(&p2).then(&p2);
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BOOST_TEST(f2.get()==4);
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}
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return boost::report_errors();
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}
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#else
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int main()
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{
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return 0;
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}
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#endif
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