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

   1 #ifndef BOOST_METAPARSE_V1_IMPL_EMPTY_STRING_HPP
   2 #define BOOST_METAPARSE_V1_IMPL_EMPTY_STRING_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
  11 namespace boost
  12 {
  13   namespace metaparse
  14   {
  15     namespace v1
  16     {
  17       namespace impl
  18       {
  19         template <class Ignore = int>
  20         struct empty_string
  21         {
  22           typedef empty_string type;
  23
  24           #ifdef BOOST_NO_CONSTEXPR_C_STR
  25             static const char value[1];
  26           #else
  27             static constexpr char value[1] = {0};
  28           #endif
  29         };
  30
  31         #ifdef BOOST_NO_CONSTEXPR_C_STR
  32           template <class Ignore>
  33           const char empty_string<Ignore>::value[1] = {0};
  34         #else
  35           template <class Ignore>
  36           constexpr char empty_string<Ignore>::value[1];
  37         #endif
  38       }
  39     }
  40   }
  41 }
  42
  43 #endif
  44