metaparse/v1/foldl_start_with_parser.hpp

0001 #ifndef BOOST_METAPARSE_V1_FOLDL_START_WITH_PARSER_HPP
0002 #define BOOST_METAPARSE_V1_FOLDL_START_WITH_PARSER_HPP
0003
0004 // Copyright Abel Sinkovics (abel@sinkovics.hu)  2012.
0005 // Distributed under the Boost Software License, Version 1.0.
0006 //    (See accompanying file LICENSE_1_0.txt or copy at
0007 //          http://www.boost.org/LICENSE_1_0.txt)
0008
0009 #include <boost/metaparse/v1/foldl.hpp>
0010
0011 namespace boost
0012 {
0013   namespace metaparse
0014   {
0015     namespace v1
0016     {
0017       template <class P, class StateP, class ForwardOp>
0018       class foldl_start_with_parser
0019       {
0020       private:
0021         template <class Res>
0022         struct apply_unchecked :
0023           foldl<P, typename get_result<Res>::type, ForwardOp>::template apply<
0024             typename get_remaining<Res>::type,
0025             typename get_position<Res>::type
0026           >
0027         {};
0028       public:
0029         typedef foldl_start_with_parser type;
0030
0031         template <class S, class Pos>
0032         struct apply :
0033           boost::mpl::eval_if<
0034             typename is_error<typename StateP::template apply<S, Pos> >::type,
0035             typename StateP::template apply<S, Pos>,
0036             apply_unchecked<typename StateP::template apply<S, Pos> >
0037           >
0038         {};
0039       };
0040     }
0041   }
0042 }
0043
0044 #endif
0045