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

   1 #ifndef BOOST_METAPARSE_V1_IMPL_REMOVE_TRAILING_NO_CHARS_HPP
   2 #define BOOST_METAPARSE_V1_IMPL_REMOVE_TRAILING_NO_CHARS_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/string.hpp>
  11 #include <boost/metaparse/v1/impl/push_front_c.hpp>
  12
  13 namespace boost
  14 {
  15   namespace metaparse
  16   {
  17     namespace v1
  18     {
  19       namespace impl
  20       {
  21         template <class S>
  22         struct remove_trailing_no_chars : S {};
  23
  24 #ifdef BOOST_METAPARSE_VARIADIC_STRING
  25         // this code assumes that BOOST_NO_CHARs are at the end of the string
  26         template <char... Cs>
  27         struct remove_trailing_no_chars<string<BOOST_NO_CHAR, Cs...>> :
  28           string<>
  29         {};
  30
  31         template <char C, char... Cs>
  32         struct remove_trailing_no_chars<string<C, Cs...>> :
  33           push_front_c<typename remove_trailing_no_chars<string<Cs...>>::type,C>
  34         {};
  35
  36 #ifdef _MSC_VER
  37         /*
  38          * These specialisations are needed to avoid an internal compiler error
  39          * in Visual C++ 12
  40          */
  41         template <char C>
  42         struct remove_trailing_no_chars<string<C>> : string<C> {};
  43
  44         template <>
  45         struct remove_trailing_no_chars<string<BOOST_NO_CHAR>> : string<> {};
  46
  47         template <>
  48         struct remove_trailing_no_chars<string<>> : string<> {};
  49 #endif
  50 #endif
  51       }
  52     }
  53   }
  54 }
  55
  56 #endif
  57