ceph/src/boost/libs/context/example/execution_context_v2/throw.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 <exception>
   9 #include <iostream>
  10 #include <stdexcept>
  11 #include <string>
  12
  13 #include <boost/context/all.hpp>
  14
  15 namespace ctx = boost::context;
  16
  17 struct my_exception : public std::runtime_error {
  18     my_exception( std::string const& what) :
  19         std::runtime_error{ what } {
  20     }
  21 };
  22
  23 int main() {
  24     ctx::execution_context< void > ctx([](ctx::execution_context<void> && ctx) {
  25         for (;;) {
  26             try {
  27                     std::cout << "entered" << std::endl;
  28                     ctx = ctx();
  29             } catch ( ctx::ontop_error const& e) {
  30                 try {
  31                     std::rethrow_if_nested( e);
  32                 } catch ( my_exception const& ex) {
  33                     std::cerr << "my_exception: " << ex.what() << std::endl;
  34                 }
  35                 return e.get_context< void >();
  36             }
  37         }
  38         return std::move( ctx);
  39     });
  40     ctx = ctx();
  41     ctx = ctx();
  42     ctx = ctx( ctx::exec_ontop_arg, []() { throw my_exception("abc"); });
  43
  44     std::cout << "main: done" << std::endl;
  45
  46     return EXIT_SUCCESS;
  47 }