ceph/src/boost/libs/context/example/v2/fibonacci.cpp

   1
   2 //          Copyright Oliver Kowalke 2014.
   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 #include <memory>
  10
  11 #include <boost/context/all.hpp>
  12
  13 namespace ctx = boost::context;
  14
  15 int main() {
  16     int n=35;
  17     ctx::execution_context< int > source(
  18         [n](ctx::execution_context< int > sink, int) mutable {
  19             int a=0;
  20             int b=1;
  21             while(n-->0){
  22                 auto result=sink(a);
  23                 sink=std::move(std::get<0>(result));
  24                 auto next=a+b;
  25                 a=b;
  26                 b=next;
  27             }
  28             return sink;
  29         });
  30     for(int i=0;i<10;++i){
  31         auto result=source(i);
  32         source=std::move(std::get<0>(result));
  33         std::cout<<std::get<1>(result)<<" ";
  34     }
  35     std::cout<<std::endl;
  36
  37     std::cout << "main: done" << std::endl;
  38 }