ceph/src/boost/libs/context/example/ontop.cpp

   1
   2 //          Copyright Oliver Kowalke 2016.
   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 <tuple>
  10
  11 #include <boost/context/continuation.hpp>
  12
  13 namespace ctx = boost::context;
  14
  15 int main() {
  16     int data = 0;
  17     ctx::continuation c = ctx::callcc( [&data](ctx::continuation && c) {
  18                         std::cout << "f1: entered first time: " << data  << std::endl;
  19                         data += 1;
  20                         c = c.resume();
  21                         std::cout << "f1: entered second time: " << data  << std::endl;
  22                         data += 1;
  23                         c = c.resume();
  24                         std::cout << "f1: entered third time: " << data << std::endl;
  25                         return std::move( c);
  26                     });
  27     std::cout << "f1: returned first time: " << data << std::endl;
  28     data += 1;
  29     c = c.resume();
  30     std::cout << "f1: returned second time: " << data << std::endl;
  31     data += 1;
  32     c = c.resume_with( [&data](ctx::continuation && c){
  33                             std::cout << "f2: entered: " << data << std::endl;
  34                             data = -1;
  35                             return std::move( c);
  36                         });
  37     std::cout << "f1: returned third time" << std::endl;
  38     std::cout << "main: done" << std::endl;
  39     return EXIT_SUCCESS;
  40 }