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Object.h

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/*
    File:           Object.h

    Function:       Definition of a polymorphic object. 
                    
    Author(s):      Andrew Willmott

    Copyright:      (c) 1995-2000, Andrew Willmott
 */

#ifndef __Object__
#define __Object__

#include <iostream.h>


class Object
{
public:
    virtual Void    Print(ostream &s) const { s << "unknown"; };
    virtual Void    Parse(istream &s)       {};
    virtual Object  *Clone() const          { return new Object; };
    virtual Void    Free()                  { delete this; };
};

typedef Object *ObjectPtr;


// --- stream operators -----------------------------------------


inline ostream &operator << (ostream &s, ObjectPtr objPtr);
inline istream &operator >> (istream &s, ObjectPtr objPtr);
inline ostream &operator << (ostream &s, Object &obj);
inline istream &operator >> (istream &s, Object &obj);


// --- Inlines ----------------------------------------------------------------


inline ostream &operator << (ostream &s, ObjectPtr objPtr)
{
    objPtr->Print(s);
    return(s);
}

inline istream &operator >> (istream &s, ObjectPtr objPtr)
{
    objPtr->Parse(s);
    return(s);
}

inline ostream &operator << (ostream &s, Object &obj)
{
    obj.Print(s);
    return(s);
}

inline istream &operator >> (istream &s, Object &obj)
{
    obj.Parse(s);
    return(s);
}


// --- Templates -----------------------------------------------------


template <class T> T *Clone(T *t)
{
    return((T *) t->Clone());
}

#endif

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