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Subject: [Threads-devel] playing with boost::unique_futures
From: Conoscenza Silente (abruzzoforteegentile_at_[hidden])
Date: 2010-03-11 13:06:18

Hi all
I am doing my first steps in using boost::unique_future and below the
example of usage
that arose my question.
Looking at the C++0x I can see that you can create a future using
If I understood correctly the good thing of it is that, based on some policy
that I imaging to be related
to number of core availables+other things, std::async will choice for you
whether to run your functions
in a specific thread, or using a ThreadPool or other available resources.
With the code I did below, once I have 2 functions I am forced to use alwyas
2 threads.
Do you know what are the alternatives in Boost/ Boost Thread and if right
now there is/there
will be an equivalent of std::async in Boost?

int firstBigOne(){
    for( int i = 0; i < 3; i++ ){
        std::cout << "firstBigOne" << std::endl;
        boost::this_thread::sleep( boost::posix_time::milliseconds(200) );

    return 10;

int secondBigOne(){
    for( int i = 0; i < 4; i++ ){
        std::cout << "secondBigONe" << std::endl;
        boost::this_thread::sleep( boost::posix_time::milliseconds(200) );
    return 20;

void TestC(){
        boost::packaged_task<int> pt1(firstBigOne);
        boost::packaged_task<int> pt2(secondBigOne);

        boost::unique_future<int> f1=pt1.get_future();
        boost::unique_future<int> f2=pt2.get_future();

        boost::thread t1( boost::move( pt1 ));
        boost::thread t2( boost::move( pt2 ));

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