ceph/src/boost/libs/spirit/include/boost/spirit/home/x3/operator/alternative.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_ALTERNATIVE_JAN_07_2013_1131AM)
   8 #define SPIRIT_ALTERNATIVE_JAN_07_2013_1131AM
   9
  10 #include <boost/spirit/home/x3/support/traits/attribute_of.hpp>
  11 #include <boost/spirit/home/x3/core/parser.hpp>
  12 #include <boost/spirit/home/x3/operator/detail/alternative.hpp>
  13
  14 namespace boost { namespace spirit { namespace x3
  15 {
  16     template <typename Left, typename Right>
  17     struct alternative : binary_parser<Left, Right, alternative<Left, Right>>
  18     {
  19         typedef binary_parser<Left, Right, alternative<Left, Right>> base_type;
  20
  21         alternative(Left const& left, Right const& right)
  22             : base_type(left, right) {}
  23
  24         template <typename Iterator, typename Context, typename RContext>
  25         bool parse(
  26             Iterator& first, Iterator const& last
  27           , Context const& context, RContext& rcontext, unused_type) const
  28         {
  29             return this->left.parse(first, last, context, rcontext, unused)
  30                || this->right.parse(first, last, context, rcontext, unused);
  31         }
  32
  33         template <typename Iterator, typename Context
  34           , typename RContext, typename Attribute>
  35         bool parse(
  36             Iterator& first, Iterator const& last
  37           , Context const& context, RContext& rcontext, Attribute& attr) const
  38         {
  39             return detail::parse_alternative(this->left, first, last, context, rcontext, attr)
  40                || detail::parse_alternative(this->right, first, last, context, rcontext, attr);
  41         }
  42     };
  43
  44     template <typename Left, typename Right>
  45     inline alternative<
  46         typename extension::as_parser<Left>::value_type
  47       , typename extension::as_parser<Right>::value_type>
  48     operator|(Left const& left, Right const& right)
  49     {
  50         return { as_parser(left), as_parser(right) };
  51     }
  52 }}}
  53
  54 namespace boost { namespace spirit { namespace x3 { namespace traits
  55 {
  56     template <typename Left, typename Right, typename Context>
  57     struct attribute_of<x3::alternative<Left, Right>, Context>
  58         : x3::detail::attribute_of_alternative<Left, Right, Context> {};
  59 }}}}
  60
  61 #endif