ceph/src/boost/libs/context/example/jump.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
  10 #include <boost/context/continuation.hpp>
  11
  12 namespace ctx = boost::context;
  13
  14 int main() {
  15     ctx::continuation c;
  16     int data = 1;
  17     c = ctx::callcc(
  18             [&data](ctx::continuation && c){
  19                 std::cout << "entered first time: " << data << std::endl;
  20                 data += 2;
  21                 c = c.resume();
  22                 std::cout << "entered second time: " << data << std::endl;
  23                 return std::move( c);
  24             });
  25     std::cout << "returned first time: " << data << std::endl;
  26     data += 2;
  27     c = c.resume();
  28     if ( c) {
  29         std::cout << "returned second time: " << data << std::endl;
  30     } else {
  31         std::cout << "returned second time: execution context terminated" << std::endl;
  32     }
  33     std::cout << "main: done" << std::endl;
  34     return EXIT_SUCCESS;
  35 }