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1 // Copyright (C) 2012-2013 Vicente Botet
3 // Distributed under the Boost Software License, Version 1.0. (See accompanying
4 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6 // <boost/thread/future.hpp>
10 // template<typename F>
11 // auto then(F&& func) -> future<decltype(func(*this))>;
13 #define BOOST_THREAD_VERSION 4
14 //#define BOOST_THREAD_USES_LOG
15 #define BOOST_THREAD_USES_LOG_THREAD_ID
16 #include <boost/thread/detail/log.hpp>
18 #include <boost/thread/future.hpp>
19 #include <boost/detail/lightweight_test.hpp>
22 #if defined BOOST_THREAD_PROVIDES_FUTURE_CONTINUATION
25 #pragma warning(disable: 4127) // conditional expression is constant
30 BOOST_THREAD_LOG
<< "p1 < " << BOOST_THREAD_END_LOG
;
31 boost::this_thread::sleep_for(boost::chrono::milliseconds(500));
32 BOOST_THREAD_LOG
<< "p1 >" << BOOST_THREAD_END_LOG
;
36 int p2(boost::future
<int> f
)
40 BOOST_THREAD_LOG
<< "p2 <" << &f
<< BOOST_THREAD_END_LOG
;
41 BOOST_TEST(f
.valid());
43 boost::this_thread::sleep_for(boost::chrono::milliseconds(500));
44 BOOST_THREAD_LOG
<< "p2 <" << &f
<< BOOST_THREAD_END_LOG
;
48 void p3(boost::future
<int> f
)
51 BOOST_THREAD_LOG
<< "p3 <" << &f
<< BOOST_THREAD_END_LOG
;
52 BOOST_TEST(f
.valid());
54 boost::this_thread::sleep_for(boost::chrono::milliseconds(500));
55 BOOST_THREAD_LOG
<< "p3 <" << &f
<< " " <<i
<< BOOST_THREAD_END_LOG
;
61 BOOST_THREAD_LOG
<< BOOST_THREAD_END_LOG
;
63 boost::future
<int> f1
= boost::async(boost::launch::async
, &p1
);
64 BOOST_TEST(f1
.valid());
65 boost::future
<int> f2
= f1
.then(boost::launch::deferred
, &p2
);
66 BOOST_TEST(f2
.valid());
67 BOOST_TEST(! f1
.valid());
70 BOOST_TEST(f2
.get()==2);
72 catch (std::exception
& ex
)
74 BOOST_THREAD_LOG
<< "ERRORRRRR "<<ex
.what() << "" << BOOST_THREAD_END_LOG
;
79 BOOST_THREAD_LOG
<< " ERRORRRRR exception thrown" << BOOST_THREAD_END_LOG
;
83 BOOST_THREAD_LOG
<< BOOST_THREAD_END_LOG
;
85 boost::future
<int> f1
= boost::async(boost::launch::async
, &p1
);
86 BOOST_TEST(f1
.valid());
87 boost::future
<void> f2
= f1
.then(boost::launch::deferred
, &p3
);
88 BOOST_TEST(f2
.valid());
93 catch (std::exception
& ex
)
95 BOOST_THREAD_LOG
<< "ERRORRRRR "<<ex
.what() << "" << BOOST_THREAD_END_LOG
;
100 BOOST_THREAD_LOG
<< " ERRORRRRR exception thrown" << BOOST_THREAD_END_LOG
;
104 BOOST_THREAD_LOG
<< BOOST_THREAD_END_LOG
;
106 boost::future
<int> f2
= boost::async(p1
).then(boost::launch::deferred
, &p2
);
107 BOOST_TEST(f2
.get()==2);
109 BOOST_THREAD_LOG
<< BOOST_THREAD_END_LOG
;
111 boost::future
<int> f1
= boost::async(p1
);
112 boost::future
<int> f21
= f1
.then(boost::launch::deferred
, &p2
);
113 boost::future
<int> f2
= f21
.then(boost::launch::deferred
, &p2
);
114 BOOST_TEST(f2
.get()==4);
116 BOOST_THREAD_LOG
<< BOOST_THREAD_END_LOG
;
118 boost::future
<int> f1
= boost::async(p1
);
119 boost::future
<int> f2
= f1
.then(boost::launch::deferred
, &p2
).then(boost::launch::deferred
, &p2
);
120 BOOST_TEST(f2
.get()==4);
122 BOOST_THREAD_LOG
<< BOOST_THREAD_END_LOG
;
124 boost::future
<int> f2
= boost::async(p1
).then(boost::launch::deferred
, &p2
).then(boost::launch::deferred
, &p2
);
125 BOOST_TEST(f2
.get()==4);
128 return boost::report_errors();