ceph/src/boost/libs/coroutine/example/asymmetric/fibonacci.cpp

   1
   2 //          Copyright Oliver Kowalke 2009.
   3 // Distributed under the Boost Software License, Version 1.0.
   4 //    (See accompanying file LICENSE_1_0.txt or copy at
   5 //          http://www.boost.org/LICENSE_1_0.txt)
   6
   7 #include <boost/coroutine/all.hpp>
   8
   9 #include <cstdlib>
  10 #include <iostream>
  11
  12 #include <boost/range.hpp>
  13
  14 void fibonacci( boost::coroutines::asymmetric_coroutine< int >::push_type & sink)
  15 {
  16     int first = 1, second = 1;
  17     sink( first);
  18     sink( second);
  19     while ( true)
  20     {
  21         int third = first + second;
  22         first = second;
  23         second = third;
  24         sink( third);
  25     }
  26 }
  27
  28 int main()
  29 {
  30     boost::coroutines::asymmetric_coroutine< int >::pull_type source( fibonacci);
  31     boost::range_iterator<
  32        boost::coroutines::asymmetric_coroutine< int >::pull_type
  33     >::type   it( boost::begin( source) );
  34     for ( int i = 0; i < 10; ++i)
  35     {
  36         std::cout << * it <<  " ";
  37         ++it;
  38     }
  39
  40     std::cout << "\nDone" << std::endl;
  41
  42     return EXIT_SUCCESS;
  43 }