metafactor/NullType.h at master · scpp/metafactor · GitHub

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////////////////////////////////////////////////////////////////////////////////
// The Loki Library
// Copyright (c) 2001 by Andrei Alexandrescu
// This code accompanies the book:
// Alexandrescu, Andrei. "Modern C++ Design: Generic Programming and Design
//     Patterns Applied". Copyright (c) 2001. Addison-Wesley.
// Permission to use, copy, modify, distribute and sell this software for any
//     purpose is hereby granted without fee, provided that the above copyright
//     notice appear in all copies and that both that copyright notice and this
//     permission notice appear in supporting documentation.
// The author or Addison-Wesley Longman make no representations about the
//     suitability of this software for any purpose. It is provided "as is"
//     without express or implied warranty.
////////////////////////////////////////////////////////////////////////////////

// Last update: November 22, 2001

#ifndef NULLTYPE_INC_
#define NULLTYPE_INC_

namespace Loki
{
////////////////////////////////////////////////////////////////////////////////
// class NullType
// Used as a placeholder for "no type here"
// Useful as an end marker in typelists
////////////////////////////////////////////////////////////////////////////////

    class NullType {};

}   // namespace Loki

////////////////////////////////////////////////////////////////////////////////
// Change log:
// June 20, 2001: ported by Nick Thurn to gcc 2.95.3. Kudos, Nick!!!
// November 22, 2001: minor change to support porting to boost
////////////////////////////////////////////////////////////////////////////////

#endif // NULLTYPE_INC_