ceph/src/boost/libs/context/example/execution_context_v2/ontop.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 <tuple>
  10
  11 #include <boost/context/all.hpp>
  12
  13 namespace ctx = boost::context;
  14
  15 ctx::execution_context< int > f1( ctx::execution_context< int > && ctx, int data) {
  16     std::cout << "f1: entered first time: " << data  << std::endl;
  17     std::tie( ctx, data) = ctx( data + 1);
  18     std::cout << "f1: entered second time: " << data  << std::endl;
  19     std::tie( ctx, data) = ctx( data + 1);
  20     std::cout << "f1: entered third time: " << data << std::endl;
  21     return std::move( ctx);
  22 }
  23
  24 int f2( int data) {
  25     std::cout << "f2: entered: " << data << std::endl;
  26     return -1;
  27 }
  28
  29 int main() {
  30     int data = 0;
  31     ctx::execution_context< int > ctx( f1);
  32     std::tie( ctx, data) = ctx( data + 1);
  33     std::cout << "f1: returned first time: " << data << std::endl;
  34     std::tie( ctx, data) = ctx( data + 1);
  35     std::cout << "f1: returned second time: " << data << std::endl;
  36     std::tie( ctx, data) = ctx( ctx::exec_ontop_arg, f2, data + 1);
  37     std::cout << "f1: returned third time" << std::endl;
  38
  39     std::cout << "main: done" << std::endl;
  40
  41     return EXIT_SUCCESS;
  42 }