ceph/src/boost/libs/spirit/include/boost/spirit/home/x3/directive/omit.hpp

   1 /*=============================================================================
   2     Copyright (c) 2001-2014 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_OMIT_MARCH_24_2007_0802AM)
   8 #define SPIRIT_OMIT_MARCH_24_2007_0802AM
   9
  10 #include <boost/spirit/home/x3/support/unused.hpp>
  11 #include <boost/spirit/home/x3/core/parser.hpp>
  12
  13 namespace boost { namespace spirit { namespace x3
  14 {
  15     ///////////////////////////////////////////////////////////////////////////
  16     // omit_directive forces the attribute of subject parser
  17     // to be unused_type
  18     ///////////////////////////////////////////////////////////////////////////
  19     template <typename Subject>
  20     struct omit_directive : unary_parser<Subject, omit_directive<Subject>>
  21     {
  22         typedef unary_parser<Subject, omit_directive<Subject> > base_type;
  23         typedef unused_type attribute_type;
  24         static bool const has_attribute = false;
  25
  26         typedef Subject subject_type;
  27         omit_directive(Subject const& subject)
  28           : base_type(subject) {}
  29
  30         template <typename Iterator, typename Context, typename RContext>
  31         bool parse(Iterator& first, Iterator const& last
  32           , Context const& context, RContext& rcontext, unused_type) const
  33         {
  34             return this->subject.parse(first, last, context, rcontext, unused);
  35         }
  36     };
  37
  38     struct omit_gen
  39     {
  40         template <typename Subject>
  41         omit_directive<typename extension::as_parser<Subject>::value_type>
  42         operator[](Subject const& subject) const
  43         {
  44             return { as_parser(subject) };
  45         }
  46     };
  47
  48     auto const omit = omit_gen{};
  49 }}}
  50
  51 #endif