ceph/src/boost/libs/fiber/examples/future.cpp

   1 #include <cstdlib>
   2 #include <exception>
   3 #include <functional>
   4 #include <iostream>
   5 #include <string>
   6
   7 #include <boost/fiber/all.hpp>
   8
   9 inline
  10 int fn( std::string const& str, int n)
  11 {
  12         for ( int i = 0; i < n; ++i)
  13         {
  14                 std::cout << i << ": " << str << std::endl;
  15                 boost::this_fiber::yield();
  16         }
  17
  18     return n;
  19 }
  20
  21 void start()
  22 {
  23     boost::fibers::future< int > fi(
  24         boost::fibers::async(
  25             std::bind( fn, "abc", 5) ) );
  26     fi.wait();
  27     std::cout << "fn() returned " << fi.get() << std::endl;
  28 }
  29
  30 int main()
  31 {
  32         try
  33         {
  34         boost::fibers::fiber( start).join();
  35                 std::cout << "done." << std::endl;
  36
  37                 return EXIT_SUCCESS;
  38         }
  39         catch ( std::exception const& e)
  40         { std::cerr << "exception: " << e.what() << std::endl; }
  41         catch (...)
  42         { std::cerr << "unhandled exception" << std::endl; }
  43         return EXIT_FAILURE;
  44 }