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///////////////////////////////////////////////////////////////////////////////
// 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)
# 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
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