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