supertrait.h

/*
    Copyright (c) 2009 Volker Krause <[email protected]>

    This library is free software; you can redistribute it and/or modify it
    under the terms of the GNU Library General Public License as published by
    the Free Software Foundation; either version 2 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 Library General Public
    License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to the
    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
    02110-1301, USA.
*/

#ifndef AKONADI_SUPERTRAIT_H
#define AKONADI_SUPERTRAIT_H

namespace Akonadi
{

namespace Internal {
template<typename T> struct check_type{ typedef void type; };
}

template <typename Super, typename = void>
struct SuperClassTrait {
    typedef Super Type;
};

template <typename Class>
struct SuperClassTrait<Class, typename Internal::check_type<typename Class::SuperClass>::type> {
    typedef typename Class::SuperClass Type;
};

template <typename Class> struct SuperClass : public SuperClassTrait<Class> {};
}

#endif