Boost_1_39_0/boost/spirit/home/qi/detail/fail_function.hpp

   1 /*=============================================================================
   2     Copyright (c) 2001-2007 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 #if !defined(SPIRIT_FAIL_FUNCTION_APR_22_2006_0159PM)
   8 #define SPIRIT_FAIL_FUNCTION_APR_22_2006_0159PM
   9
  10 #include <boost/spirit/home/support/unused.hpp>
  11
  12 namespace boost { namespace spirit { namespace qi { namespace detail
  13 {
  14     template <typename Iterator, typename Context, typename Skipper>
  15     struct fail_function
  16     {
  17         fail_function(
  18             Iterator& first, Iterator const& last
  19           , Context& context, Skipper const& skipper)
  20           : first(first)
  21           , last(last)
  22           , context(context)
  23           , skipper(skipper)
  24         {
  25         }
  26
  27         template <typename Component, typename Attribute>
  28         bool operator()(Component const& component, Attribute& attr)
  29         {
  30             // return true if the parser fails
  31             typedef typename Component::director director;
  32             return !director::parse(component, first, last, context, skipper, attr);
  33         }
  34
  35         template <typename Component>
  36         bool operator()(Component const& component)
  37         {
  38             // return true if the parser fails
  39             typedef typename Component::director director;
  40             return !director::parse(component, first, last, context, skipper, unused);
  41         }
  42
  43         Iterator& first;
  44         Iterator const& last;
  45         Context& context;
  46         Skipper const& skipper;
  47     };
  48 }}}}
  49
  50 #endif