ceph/src/boost/libs/coroutine/example/asymmetric/power.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/bind.hpp>
  13 #include <boost/foreach.hpp>
  14 #include <boost/range.hpp>
  15
  16 void power( boost::coroutines::asymmetric_coroutine< int >::push_type & sink, int number, int exponent)
  17 {
  18     int counter = 0;
  19     int result = 1;
  20     while ( counter++ < exponent)
  21     {
  22             result = result * number;
  23             sink( result);
  24     }
  25 }
  26
  27 int main()
  28 {
  29     {
  30         std::cout << "using range functions" << std::endl;
  31         boost::coroutines::asymmetric_coroutine< int >::pull_type source( boost::bind( power, _1, 2, 8) );
  32         boost::coroutines::asymmetric_coroutine< int >::pull_type::iterator e( boost::end( source) );
  33         for ( boost::coroutines::asymmetric_coroutine< int >::pull_type::iterator i( boost::begin( source) );
  34               i != e; ++i)
  35             std::cout << * i <<  " ";
  36     }
  37
  38     {
  39         std::cout << "\nusing BOOST_FOREACH" << std::endl;
  40         boost::coroutines::asymmetric_coroutine< int >::pull_type source( boost::bind( power, _1, 2, 8) );
  41         BOOST_FOREACH( int i, source)
  42         { std::cout << i <<  " "; }
  43     }
  44
  45     std::cout << "\nDone" << std::endl;
  46
  47     return EXIT_SUCCESS;
  48 }