text: /*=============================================================================
      Copyright (c) 2001-2015 Joel de Guzman
  
      Distributed under the Boost Software License, Version 1.0. (See accompanying
      file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  =============================================================================*/
  #include <boost/spirit/home/x3.hpp>
  
  #include <iostream>
  
  // Presented are various ways to attach semantic actions
  //  * Using plain function pointer
  //  * Using simple function object
  
  namespace client
  {
      namespace x3 = boost::spirit::x3;
      using x3::_attr;
  
      struct print_action
      {
          template <typename Context>
          void operator()(Context const& ctx) const
          {
              std::cout << _attr(ctx) << std::endl;
          }
      };
  }
  
  int main()
  {
      using boost::spirit::x3::int_;
      using boost::spirit::x3::parse;
      using client::print_action;
  
      { // example using function object
  
          char const *first = "{43}", *last = first + std::strlen(first);
          parse(first, last, '{' >> int_[print_action()] >> '}');
      }
  
      { // example using C++14 lambda
  
          using boost::spirit::x3::_attr;
          char const *first = "{44}", *last = first + std::strlen(first);
          auto f = [](auto& ctx){ std::cout << _attr(ctx) << std::endl; };
          parse(first, last, '{' >> int_[f] >> '}');
      }
  
      return 0;
  }
  