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

   1 #ifndef BOOST_METAPARSE_V1_IMPL_AT_C_HPP
   2 #define BOOST_METAPARSE_V1_IMPL_AT_C_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/mpl/char.hpp>
  13
  14 #include <boost/preprocessor/repetition/enum_params.hpp>
  15 #include <boost/preprocessor/repetition/repeat.hpp>
  16
  17 namespace boost
  18 {
  19   namespace metaparse
  20   {
  21     namespace v1
  22     {
  23       namespace impl
  24       {
  25         template <class S, int N>
  26         struct at_c;
  27
  28 #ifdef BOOST_METAPARSE_VARIADIC_STRING
  29         template <char C, char... Cs, int N>
  30         struct at_c<string<C, Cs...>, N> : at_c<string<Cs...>, N - 1> {};
  31
  32         template <char C, char... Cs>
  33         struct at_c<string<C, Cs...>, 0> : boost::mpl::char_<C> {};
  34 #else
  35         #ifdef BOOST_METAPARSE_STRING_CASE
  36         #  error BOOST_METAPARSE_STRING_CASE is already defined
  37         #endif
  38         #define BOOST_METAPARSE_STRING_CASE(z, n, unused) \
  39           template < \
  40             BOOST_PP_ENUM_PARAMS(BOOST_METAPARSE_LIMIT_STRING_SIZE, int C) \
  41           > \
  42           struct \
  43             at_c< \
  44               string< \
  45                 BOOST_PP_ENUM_PARAMS(BOOST_METAPARSE_LIMIT_STRING_SIZE, C) \
  46               >, \
  47               n \
  48             > : \
  49             boost::mpl::char_<BOOST_PP_CAT(C, n)> \
  50           {};
  51
  52         BOOST_PP_REPEAT(
  53           BOOST_METAPARSE_LIMIT_STRING_SIZE,
  54           BOOST_METAPARSE_STRING_CASE,
  55           ~
  56         )
  57
  58         #undef BOOST_METAPARSE_STRING_CASE
  59 #endif
  60       }
  61     }
  62   }
  63 }
  64
  65 #endif
  66