core/matcher/any_matcher.hpp

0001 ///////////////////////////////////////////////////////////////////////////////
0002 // any_matcher.hpp
0003 //
0004 //  Copyright 2008 Eric Niebler. Distributed under the Boost
0005 //  Software License, Version 1.0. (See accompanying file
0006 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0007
0008 #ifndef BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_ANY_MATCHER_HPP_EAN_10_04_2005
0009 #define BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_ANY_MATCHER_HPP_EAN_10_04_2005
0010
0011 // MS compatible compilers support #pragma once
0012 #if defined(_MSC_VER)
0013 # pragma once
0014 #endif
0015
0016 #include <boost/xpressive/detail/detail_fwd.hpp>
0017 #include <boost/xpressive/detail/core/quant_style.hpp>
0018 #include <boost/xpressive/detail/core/state.hpp>
0019
0020 namespace boost { namespace xpressive { namespace detail
0021 {
0022
0023     ///////////////////////////////////////////////////////////////////////////////
0024     // any_matcher
0025     //
0026     struct any_matcher
0027     {
0028         BOOST_XPR_QUANT_STYLE(quant_fixed_width, 1, true)
0029
0030         template<typename BidiIter, typename Next>
0031         static bool match(match_state<BidiIter> &state, Next const &next)
0032         {
0033             if(state.eos())
0034             {
0035                 return false;
0036             }
0037
0038             ++state.cur_;
0039             if(next.match(state))
0040             {
0041                 return true;
0042             }
0043
0044             --state.cur_;
0045             return false;
0046         }
0047     };
0048
0049 }}}
0050
0051 #endif