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#ifndef SD_SLIDESORTER_ENUMERATION_HXX
#define SD_SLIDESORTER_ENUMERATION_HXX

#include <memory>

namespace sd { namespace slidesorter { namespace model {


/** Interface to generic enumerations.  Designed to operate on shared
    pointers.  Therefore GetNextElement() returns T and not T&.
*/
template <class T>
class Enumeration
{
public:
    virtual bool HasMoreElements (void) const = 0;
    /** Returns T instead of T& so that it can handle shared pointers.
    */
    virtual T GetNextElement (void) = 0;
    virtual void Rewind (void) = 0;
    virtual ::std::auto_ptr<Enumeration<T> > Clone (void) = 0;
}; 

} } } // end of namespace ::sd::slidesorter::model

#endif
