Clone.hh

//********************************************************************
//*** util/Clone.hh
//*** Copyright (c) 2003-2009 by Markus Winand <mws@fatalmind.com>
//*** $Id: Clone.hh,v 1.10 2009-03-02 14:16:47 mws Exp $
//********************************************************************

#ifndef UTIL_CLONE_HH
#define UTIL_CLONE_HH

#include <typeinfo>

#include "Exceptions/Exception.hh"

namespace fatalmind {

class Clone;

class CloneException: public Exception {
    public:
        CloneException(const Clone* const t1);
    private:
        static std::string getCloneErrorMessage(const Clone* const t1);
};

// according to C++ Coding Standards, Herb Sutter, Andrei Alexandrescu 2005
class Clone {
    public:
        Clone* clone() const {
            return clone<Clone>();
        }

        template<class Derived>
        Derived* clone() const {
            Clone* c = DoClone();
            if (typeid(*c) != typeid(*this)) {
                throw CloneException(this);
            }
            Derived& d = dynamic_cast<Derived&>(*c);
            return &d;
        }
    protected:
        virtual Clone* DoClone() const = 0;
        virtual ~Clone() {
        }
};

}

#endif

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