metaparse/v1/sequence_apply.hpp

0001 #ifndef BOOST_METAPARSE_V1_SEQUENCE_APPLY_HPP
0002 #define BOOST_METAPARSE_V1_SEQUENCE_APPLY_HPP
0003
0004 // Copyright Abel Sinkovics (abel@sinkovics.hu)  2015.
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/letter.hpp>
0010 #include <boost/metaparse/v1/sequence.hpp>
0011
0012 #include <boost/metaparse/limit_sequence_size.hpp>
0013
0014 #include <boost/mpl/at.hpp>
0015
0016 #include <boost/preprocessor/cat.hpp>
0017 #include <boost/preprocessor/repetition/repeat_from_to.hpp>
0018 #include <boost/preprocessor/repetition/enum.hpp>
0019 #include <boost/preprocessor/repetition/enum_params.hpp>
0020 #include <boost/preprocessor/tuple/eat.hpp>
0021
0022 namespace boost
0023 {
0024   namespace metaparse
0025   {
0026     namespace v1
0027     {
0028 #ifdef BOOST_METAPARSE_SEQUENCE_APPLY_ARG
0029 #  error BOOST_METAPARSE_SEQUENCE_APPLY_ARG already defined
0030 #endif
0031 #define BOOST_METAPARSE_SEQUENCE_APPLY_ARG(z, n, container) \
0032   typename boost::mpl::at_c<container, n>::type
0033
0034 #ifdef BOOST_METAPARSE_SEQUENCE_APPLY
0035 #  error BOOST_METAPARSE_SEQUENCE_APPLY already defined
0036 #endif
0037 #define BOOST_METAPARSE_SEQUENCE_APPLY(z, n, unused) \
0038   namespace impl \
0039   { \
0040   template < \
0041     template <BOOST_PP_ENUM(n, class BOOST_PP_TUPLE_EAT(3), ~)> class T \
0042   > \
0043   struct BOOST_PP_CAT(sequence_apply_transform, n) \
0044   { \
0045     typedef BOOST_PP_CAT(sequence_apply_transform, n) type; \
0046     \
0047     template <class V> \
0048     struct apply \
0049     { \
0050       typedef T<BOOST_PP_ENUM(n, BOOST_METAPARSE_SEQUENCE_APPLY_ARG, V)> type; \
0051     }; \
0052   }; \
0053   } \
0054   \
0055   template < \
0056     template <BOOST_PP_ENUM(n, class BOOST_PP_TUPLE_EAT(3), ~)> class T, \
0057     BOOST_PP_ENUM_PARAMS(n, class P) \
0058   > \
0059   struct BOOST_PP_CAT(sequence_apply, n) : \
0060     transform< \
0061       sequence<BOOST_PP_ENUM_PARAMS(n, P)>, \
0062       BOOST_PP_CAT(impl::sequence_apply_transform, n)<T> \
0063     > \
0064   {};
0065
0066       BOOST_PP_REPEAT_FROM_TO(
0067         1,
0068         BOOST_METAPARSE_LIMIT_SEQUENCE_SIZE,
0069         BOOST_METAPARSE_SEQUENCE_APPLY,
0070         ~
0071       )
0072
0073 #undef BOOST_METAPARSE_SEQUENCE_APPLY
0074 #undef BOOST_METAPARSE_SEQUENCE_APPLY_ARG
0075     }
0076   }
0077 }
0078
0079 #endif
0080