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 <cstdlib>
   8 #include <iostream>
   9
  10 #include <boost/range.hpp>
  11 #include <boost/coroutine/all.hpp>
  12
  13 void fibonacci( boost::coroutines::asymmetric_coroutine< int >::push_type & sink)
  14 {
  15     int first = 1, second = 1;
  16     sink( first);
  17     sink( second);
  18     while ( true)
  19     {
  20         int third = first + second;
  21         first = second;
  22         second = third;
  23         sink( third);
  24     }
  25 }
  26
  27 int main()
  28 {
  29     boost::coroutines::asymmetric_coroutine< int >::pull_type source( fibonacci);
  30     boost::range_iterator<
  31        boost::coroutines::asymmetric_coroutine< int >::pull_type
  32     >::type   it( boost::begin( source) );
  33     for ( int i = 0; i < 10; ++i)
  34     {
  35         std::cout << * it <<  " ";
  36         ++it;
  37     }
  38
  39     std::cout << "\nDone" << std::endl;
  40
  41     return EXIT_SUCCESS;
  42 }