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Ruta de la carpeta: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\boost_1_35_0\boost\xpressive\detail\core\matcher\mark_begin_matcher.hpp

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///////////////////////////////////////////////////////////////////////////////
// mark_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_MARK_BEGIN_MATCHER_HPP_EAN_10_04_2005
#define BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_MARK_BEGIN_MATCHER_HPP_EAN_10_04_2005

// 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
{

    ///////////////////////////////////////////////////////////////////////////////
    // mark_begin_matcher
    //
    struct mark_begin_matcher
      : quant_style<quant_fixed_width, 0, false>
    {
        int mark_number_; // signed because it could be negative

        mark_begin_matcher(int mark_number)
          : mark_number_(mark_number)
        {
        }

        template<typename BidiIter, typename Next>
        bool match(match_state<BidiIter> &state, Next const &next) const
        {
            sub_match_impl<BidiIter> &br = state.sub_match(this->mark_number_);

            BidiIter old_begin = br.begin_;
            br.begin_ = state.cur_;

            if(next.match(state))
            {
                return true;
            }

            br.begin_ = old_begin;
            return false;
        }
    };

}}}

#endif

mark_begin_matcher.hpp

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