ceph/src/boost/libs/metaparse/include/boost/metaparse/v1/impl/pop_front.hpp

   1 #ifndef BOOST_METAPARSE_V1_IMPL_POP_FRONT_HPP
   2 #define BOOST_METAPARSE_V1_IMPL_POP_FRONT_HPP
   3
   4 // Copyright Abel Sinkovics (abel@sinkovics.hu)  2013.
   5 // Distributed under the Boost Software License, Version 1.0.
   6 //    (See accompanying file LICENSE_1_0.txt or copy at
   7 //          http://www.boost.org/LICENSE_1_0.txt)
   8
   9 #include <boost/metaparse/config.hpp>
  10 #include <boost/metaparse/v1/fwd/string.hpp>
  11
  12 #include <boost/preprocessor/repetition/enum_params.hpp>
  13 #include <boost/preprocessor/repetition/repeat_from_to.hpp>
  14
  15 namespace boost
  16 {
  17   namespace metaparse
  18   {
  19     namespace v1
  20     {
  21       namespace impl
  22       {
  23         template <class S>
  24         struct pop_front;
  25
  26 #ifdef BOOST_METAPARSE_VARIADIC_STRING
  27         template <char C, char... Cs>
  28         struct pop_front<string<C, Cs...>> : string<Cs...> {};
  29 #else
  30         #ifdef BOOST_METAPARSE_POP_FRONT
  31         #  error BOOST_METAPARSE_POP_FRONT already defined
  32         #endif
  33         #define BOOST_METAPARSE_POP_FRONT(z, n, unused) \
  34           BOOST_PP_COMMA_IF(BOOST_PP_DEC(n)) BOOST_PP_CAT(C, n)
  35
  36         template < \
  37           BOOST_PP_ENUM_PARAMS(BOOST_METAPARSE_LIMIT_STRING_SIZE, int C) \
  38         >
  39         struct
  40           pop_front<
  41             string<BOOST_PP_ENUM_PARAMS(BOOST_METAPARSE_LIMIT_STRING_SIZE, C)>
  42           > :
  43           string<
  44             BOOST_PP_REPEAT_FROM_TO(
  45               1,
  46               BOOST_METAPARSE_LIMIT_STRING_SIZE,
  47               BOOST_METAPARSE_POP_FRONT,
  48               ~
  49             ),
  50             BOOST_NO_CHAR
  51           >
  52         {};
  53
  54         #undef BOOST_METAPARSE_POP_FRONT
  55 #endif
  56       }
  57     }
  58   }
  59 }
  60
  61 #endif
  62