ceph/src/boost/libs/spirit/classic/example/fundamental/error_handling.cpp

   1 /*=============================================================================
   2     Copyright (c) 1998-2003 Joel de Guzman
   3     http://spirit.sourceforge.net/
   4
   5     Use, modification and distribution is subject to the Boost Software
   6     License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   7     http://www.boost.org/LICENSE_1_0.txt)
   8 =============================================================================*/
   9 ///////////////////////////////////////////////////////////////////////////////
  10 //
  11 //  This sample demonstrates error handling as seen in the
  12 //  Error Handling" chapter in the User's Guide.
  13 //
  14 ///////////////////////////////////////////////////////////////////////////////
  15 #include <boost/spirit/include/classic_core.hpp>
  16 #include <boost/spirit/include/classic_exceptions.hpp>
  17 #include <iostream>
  18 #include <boost/assert.hpp>
  19
  20 using namespace std;
  21 using namespace BOOST_SPIRIT_CLASSIC_NS;
  22
  23 struct handler
  24 {
  25     template <typename ScannerT, typename ErrorT>
  26     error_status<>
  27     operator()(ScannerT const& /*scan*/, ErrorT const& /*error*/) const
  28     {
  29         cout << "exception caught...Test concluded successfully" << endl;
  30         return error_status<>(error_status<>::fail);
  31     }
  32 };
  33
  34 int
  35 main()
  36 {
  37     cout << "/////////////////////////////////////////////////////////\n\n";
  38     cout << "\t\tExceptions Test...\n\n";
  39     cout << "/////////////////////////////////////////////////////////\n\n";
  40
  41     assertion<int>  expect(0);
  42     guard<int>      my_guard;
  43
  44     rule<> start =
  45         my_guard(ch_p('a') >> 'b' >> 'c' >> expect( ch_p('d') ))
  46         [
  47             handler()
  48         ];
  49
  50     bool r = parse("abcx", start).full;
  51
  52     BOOST_ASSERT(!r);
  53     return 0;
  54 }
  55