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> matchboost::xpressive::detail::attr_begin_matcher31 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 51