ceph/src/boost/boost/metaparse/v1/cpp11/impl/remove_trailing_no_chars.hpp

   1 #ifndef BOOST_METAPARSE_V1_CPP11_IMPL_REMOVE_TRAILING_NO_CHARS_HPP
   2 #define BOOST_METAPARSE_V1_CPP11_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/v1/cpp11/string.hpp>
  10 #include <boost/metaparse/v1/impl/no_char.hpp>
  11 #include <boost/metaparse/v1/cpp11/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         // this code assumes that BOOST_NO_CHARs are at the end of the string
  25         template <char... Cs>
  26         struct remove_trailing_no_chars<string<BOOST_NO_CHAR, Cs...>> :
  27           string<>
  28         {};
  29
  30         template <char C, char... Cs>
  31         struct remove_trailing_no_chars<string<C, Cs...>> :
  32           push_front_c<typename remove_trailing_no_chars<string<Cs...>>::type,C>
  33         {};
  34
  35 #ifdef _MSC_VER
  36         /*
  37          * These specialisations are needed to avoid an internal compiler error
  38          * in Visual C++ 12
  39          */
  40         template <char C>
  41         struct remove_trailing_no_chars<string<C>> : string<C> {};
  42
  43         template <>
  44         struct remove_trailing_no_chars<string<BOOST_NO_CHAR>> : string<> {};
  45
  46         template <>
  47         struct remove_trailing_no_chars<string<>> : string<> {};
  48 #endif
  49       }
  50     }
  51   }
  52 }
  53
  54 #endif
  55