Imported Upstream version 1.72.0
[platform/upstream/boost.git] / 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 }