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- ///////////////////////////////////////////////////////////////////////////////
- // attr_begin_matcher.hpp
- //
- // Copyright 2008 Eric Niebler. Distributed under the Boost
- // Software License, Version 1.0. (See accompanying file
- // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
- #ifndef BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_ATTR_BEGIN_MATCHER_HPP_EAN_06_09_2007
- #define BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_ATTR_BEGIN_MATCHER_HPP_EAN_06_09_2007
- // MS compatible compilers support #pragma once
- #if defined(_MSC_VER)
- # pragma once
- #endif
- #include <boost/xpressive/detail/detail_fwd.hpp>
- #include <boost/xpressive/detail/core/quant_style.hpp>
- #include <boost/xpressive/detail/core/state.hpp>
- namespace boost { namespace xpressive { namespace detail
- {
- ///////////////////////////////////////////////////////////////////////////////
- // attr_begin_matcher
- //
- template<typename Nbr>
- struct attr_begin_matcher
- : quant_style<quant_none, 0, false>
- {
- template<typename BidiIter, typename Next>
- static bool match(match_state<BidiIter> &state, Next const &next)
- {
- void const *attr_slots[Nbr::value] = {};
- attr_context old_attr_context = state.attr_context_;
- state.attr_context_.attr_slots_ = attr_slots;
- state.attr_context_.prev_attr_context_ = &old_attr_context;
- if(next.match(state))
- {
- return true;
- }
- state.attr_context_ = old_attr_context;
- return false;
- }
- };
- }}}
- #endif
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