ceph/src/boost/boost/xpressive/detail/core/matcher/attr_begin_matcher.hpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // attr_begin_matcher.hpp
   3 //
   4 //  Copyright 2008 Eric Niebler. Distributed under the Boost
   5 //  Software License, Version 1.0. (See accompanying file
   6 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   7
   8 #ifndef BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_ATTR_BEGIN_MATCHER_HPP_EAN_06_09_2007
   9 #define BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_ATTR_BEGIN_MATCHER_HPP_EAN_06_09_2007
  10
  11 // MS compatible compilers support #pragma once
  12 #if defined(_MSC_VER)
  13 # pragma once
  14 #endif
  15
  16 #include <boost/xpressive/detail/detail_fwd.hpp>
  17 #include <boost/xpressive/detail/core/quant_style.hpp>
  18 #include <boost/xpressive/detail/core/state.hpp>
  19
  20 namespace boost { namespace xpressive { namespace detail
  21 {
  22
  23     ///////////////////////////////////////////////////////////////////////////////
  24     // attr_begin_matcher
  25     //
  26     template<typename Nbr>
  27     struct attr_begin_matcher
  28       : quant_style<quant_none, 0, false>
  29     {
  30         template<typename BidiIter, typename Next>
  31         static bool match(match_state<BidiIter> &state, Next const &next)
  32         {
  33             void const *attr_slots[Nbr::value] = {};
  34             attr_context old_attr_context = state.attr_context_;
  35             state.attr_context_.attr_slots_ = attr_slots;
  36             state.attr_context_.prev_attr_context_ = &old_attr_context;
  37
  38             if(next.match(state))
  39             {
  40                 return true;
  41             }
  42
  43             state.attr_context_ = old_attr_context;
  44             return false;
  45         }
  46     };
  47
  48 }}}
  49
  50 #endif