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/Src/Dependencies/Boost/boost/xpressive/detail/core/matcher/attr_begin_matcher.hpp

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C++ Header | 50 lines | 31 code | 9 blank | 10 comment | 2 complexity | d24cf1cf4be94599296a5bdc7c2dca2c MD5 | raw file
 1///////////////////////////////////////////////////////////////////////////////
 2// attr_begin_matcher.hpp
 3//
 4//  Copyright 2008 Eric Niebler. Distributed under the Boost
 5//  Software License, Version 1.0. (See accompanying file
 6//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 7
 8#ifndef BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_ATTR_BEGIN_MATCHER_HPP_EAN_06_09_2007
 9#define BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_ATTR_BEGIN_MATCHER_HPP_EAN_06_09_2007
10
11// MS compatible compilers support #pragma once
12#if defined(_MSC_VER) && (_MSC_VER >= 1020)
13# pragma once
14#endif
15
16#include <boost/xpressive/detail/detail_fwd.hpp>
17#include <boost/xpressive/detail/core/quant_style.hpp>
18#include <boost/xpressive/detail/core/state.hpp>
19
20namespace boost { namespace xpressive { namespace detail
21{
22
23    ///////////////////////////////////////////////////////////////////////////////
24    // attr_begin_matcher
25    //
26    template<typename Nbr>
27    struct attr_begin_matcher
28      : quant_style<quant_none, 0, false>
29    {
30        template<typename BidiIter, typename Next>
31        static bool match(match_state<BidiIter> &state, Next const &next)
32        {
33            void const *attr_slots[Nbr::value] = {};
34            attr_context old_attr_context = state.attr_context_;
35            state.attr_context_.attr_slots_ = attr_slots;
36            state.attr_context_.prev_attr_context_ = &old_attr_context;
37
38            if(next.match(state))
39            {
40                return true;
41            }
42
43            state.attr_context_ = old_attr_context;
44            return false;
45        }
46    };
47
48}}}
49
50#endif