crtp_base.hpp

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// This file is a part of NiHu, a C++ BEM template library.
//
// Copyright (C) 2012-2014  Peter Fiala <fiala@hit.bme.hu>
// Copyright (C) 2012-2014  Peter Rucz <rucz@hit.bme.hu>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
#ifndef CRTP_BASE_HPP_INCLUDED
#define CRTP_BASE_HPP_INCLUDED
 
#define NIHU_CRTP_HELPERS \
    Derived const &derived() const \
    { \
        return static_cast<Derived const &>(*this); \
    } \
    Derived &derived() \
    { \
        return static_cast<Derived &>(*this); \
    }
 
template <class T, class...Ignore>
struct ignore
{
    typedef T type;
};
 
template <class Derived, class Dummy>
typename ignore<Derived, Dummy>::type const* const_crtp_ptr(void)
{
    return static_cast<typename ignore<Derived, Dummy>::type const*>(nullptr);
}
 
#endif // CRTP_BASE_HPP_INCLUDED