ceph/src/boost/libs/spirit/example/qi/typeof.cpp

   1 /*=============================================================================
   2     Copyright (c) 2001-2010 Joel de Guzman
   3
   4     Distributed under the Boost Software License, Version 1.0. (See accompanying
   5     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 =============================================================================*/
   7 #include <boost/spirit/include/qi.hpp>
   8 #include <boost/spirit/include/qi_copy.hpp>
   9 #include <boost/spirit/include/support_auto.hpp>
  10 #include <iostream>
  11 #include <string>
  12
  13 ///////////////////////////////////////////////////////////////////////////////
  14 //  Main program
  15 ///////////////////////////////////////////////////////////////////////////////
  16
  17 int
  18 main()
  19 {
  20     using boost::spirit::ascii::space;
  21     using boost::spirit::ascii::char_;
  22     using boost::spirit::qi::parse;
  23     typedef std::string::const_iterator iterator_type;
  24
  25 ///////////////////////////////////////////////////////////////////////////////
  26 // this works for non-c++11 compilers
  27 #ifdef BOOST_NO_CXX11_AUTO_DECLARATIONS
  28
  29     BOOST_SPIRIT_AUTO(qi, comment, "/*" >> *(char_ - "*/") >> "*/");
  30
  31 ///////////////////////////////////////////////////////////////////////////////
  32 // but this is better for c++11 compilers with auto
  33 #else
  34
  35     using boost::spirit::qi::copy;
  36
  37     auto comment = copy("/*" >> *(char_ - "*/") >> "*/");
  38
  39 #endif
  40
  41     std::string str = "/*This is a comment*/";
  42     std::string::const_iterator iter = str.begin();
  43     std::string::const_iterator end = str.end();
  44     bool r = parse(iter, end, comment);
  45
  46     if (r && iter == end)
  47     {
  48         std::cout << "-------------------------\n";
  49         std::cout << "Parsing succeeded\n";
  50         std::cout << "-------------------------\n";
  51     }
  52     else
  53     {
  54         std::string rest(iter, end);
  55         std::cout << "-------------------------\n";
  56         std::cout << "Parsing failed\n";
  57         std::cout << "stopped at: \": " << rest << "\"\n";
  58         std::cout << "-------------------------\n";
  59     }
  60
  61     return 0;
  62 }
  63
  64