future

future.cpp

#include <iostream>
#include <future>
#include <list>

// http://isocpp.org/blog/2013/07/what-is-stdpromise-stackoverflow

// g++ -std=c++0x -pthread test.cpp
// tested in gcc 4.6.3

class OneTask {

        std::promise<std::list<int> > resList;

        public:
                void Execute(int x) {
                        std::list<int> res;
                        for(int i=0; i<x; ++i) {
                                res.push_back(i);
                        }
                        resList.set_value(move(res));
                        std::cout << "task run" << std::endl;
                }

                std::future<std::list<int> > Result() {
                        return resList.get_future();
                }

};





int main(int argc, char **argv) {
        OneTask ot;
        std::future<std::list<int> > fut = ot.Result();
        std::thread th(&OneTask::Execute,&ot,2);

        std::cout << "task queued" << std::endl;

        std::list<int> res = fut.get();
        int r = res.size();
        std::cout << r << std::endl;

        th.join();
}