| /////////////////////////////////////////////////////////////////////////////// |
| // mark_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_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 |