/////////////////////////////////////////////////////////////////////////////// | |
// 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) && (_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 |