/////////////////////////////////////////////////////////////////////////////// | |
// 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 |