///////////////////////////////////////////////////////////////////////////////

// attr_begin_matcher.hpp

//

//  Copyright 2007 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) && (_MSC_VER >= 1020)

# 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

