| 1 | // Copyright (C) 2013 Vicente Botet |
|---|---|
| 2 | // |
| 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) |
| 5 | |
| 6 | #define BOOST_THREAD_VERSION 4 |
| 7 | |
| 8 | #include <iostream> |
| 9 | #include <functional> |
| 10 | //#include <future> |
| 11 | |
| 12 | #include <boost/thread.hpp> |
| 13 | #include <boost/shared_ptr.hpp> |
| 14 | |
| 15 | int f() |
| 16 | { |
| 17 | return 42; |
| 18 | } |
| 19 | |
| 20 | boost::packaged_task<int()>* schedule(boost::function<int ()> const& fn) |
| 21 | { |
| 22 | // Normally, the pointer to the packaged task is stored in a queue |
| 23 | // for execution on a separate thread, and the schedule function |
| 24 | // would return just a future<T> |
| 25 | |
| 26 | boost::function<int ()> copy(fn); |
| 27 | boost::packaged_task<int()>* result = new boost::packaged_task<int()>(copy); |
| 28 | return result; |
| 29 | } |
| 30 | |
| 31 | struct MyFunc |
| 32 | { |
| 33 | MyFunc(MyFunc const&) = delete; |
| 34 | MyFunc& operator=(MyFunc const&) = delete; |
| 35 | MyFunc() {}; |
| 36 | MyFunc(MyFunc &&) {}; |
| 37 | MyFunc& operator=(MyFunc &&) { return *this;}; |
| 38 | void operator()()const {} |
| 39 | }; |
| 40 | |
| 41 | |
| 42 | int main() |
| 43 | { |
| 44 | boost::packaged_task<int()>* p(schedule(fn: f)); |
| 45 | (*p)(); |
| 46 | |
| 47 | boost::future<int> fut = p->get_future(); |
| 48 | std::cout << "The answer to the ultimate question: "<< fut.get() << std::endl; |
| 49 | |
| 50 | { |
| 51 | boost::function<void()> f; |
| 52 | MyFunc mf; |
| 53 | |
| 54 | boost::packaged_task<void()> t1(f); |
| 55 | boost::packaged_task<void()> t2(boost::move(t&: mf)); |
| 56 | } |
| 57 | |
| 58 | return 0; |
| 59 | } |
| 60 | |
| 61 | |
| 62 |