sizeof_void.hpp

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#ifndef LIBJMMCG_CORE_SIZEOF_VOID_HPP
#define LIBJMMCG_CORE_SIZEOF_VOID_HPP
/******************************************************************************
** Copyright © 2019 by J.M.McGuiness, coder@hussar.me.uk
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Lesser General Public
** License as published by the Free Software Foundation; either
** version 2.1 of the License, or (at your option) any later version.
**
** This library is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** Lesser General Public License for more details.
**
** You should have received a copy of the GNU Lesser General Public
** License along with this library; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
 
namespace jmmcg { namespace LIBJMMCG_VER_NAMESPACE {
 
struct a_zero_sized_class {};
 
namespace private_ {
 
   /**
      Avoid sizeof(void) warnings, give it a size of zero.
   */
   template<class T>
   struct give_void_a_size_of {
      enum : std::size_t {
         value=sizeof(T)
      };
   };
   template<>
   struct give_void_a_size_of<void> {
      enum : std::size_t {
         value=std::size_t()
      };
   };
   template<>
   struct give_void_a_size_of<a_zero_sized_class> {
      enum : std::size_t {
         value=std::size_t()
      };
   };
 
}
 
} }
 
#endif