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