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Diffstat (limited to 'boost/metaparse/v1/foldr_start_with_parser.hpp')
-rw-r--r-- | boost/metaparse/v1/foldr_start_with_parser.hpp | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/boost/metaparse/v1/foldr_start_with_parser.hpp b/boost/metaparse/v1/foldr_start_with_parser.hpp new file mode 100644 index 0000000000..c5f59eacf4 --- /dev/null +++ b/boost/metaparse/v1/foldr_start_with_parser.hpp @@ -0,0 +1,78 @@ +#ifndef BOOST_METAPARSE_V1_FOLDR_START_WITH_PARSER_HPP +#define BOOST_METAPARSE_V1_FOLDR_START_WITH_PARSER_HPP + +// Copyright Abel Sinkovics (abel@sinkovics.hu) 2012. +// 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) + +#include <boost/metaparse/v1/accept.hpp> +#include <boost/metaparse/v1/is_error.hpp> +#include <boost/metaparse/v1/get_position.hpp> +#include <boost/metaparse/v1/get_result.hpp> +#include <boost/metaparse/v1/get_remaining.hpp> + +#include <boost/mpl/eval_if.hpp> + +namespace boost +{ + namespace metaparse + { + namespace v1 + { + template <class P, class StateP, class BackwardOp> + struct foldr_start_with_parser + { + private: + template <class Res, class Rem> + struct apply_unchecked1 : + accept< + typename BackwardOp::template apply< + typename get_result<Rem>::type, + typename get_result<Res>::type + >::type, + typename get_remaining<Rem>::type, + typename get_position<Rem>::type + > + {}; + + template <class Res> + struct apply_unchecked; + public: + typedef foldr_start_with_parser type; + + template <class S, class Pos> + struct apply : + boost::mpl::eval_if< + typename is_error<typename P::template apply<S, Pos> >::type, + typename StateP::template apply<S, Pos>, + apply_unchecked<typename P::template apply<S, Pos> > + > + {}; + private: + template <class Res> + struct apply_unchecked + { + private: + typedef + typename foldr_start_with_parser::template apply< + typename get_remaining<Res>::type, + typename get_position<Res>::type + > + parsed_remaining; + public: + typedef + typename boost::mpl::eval_if< + typename is_error<parsed_remaining>::type, + parsed_remaining, + apply_unchecked1<Res, parsed_remaining> + >::type + type; + }; + }; + } + } +} + +#endif + |