The Simons     Component Library

           

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NullPointer.h

//
//  SCL : Simons Component Library
//
//
//  Filename:   NullPointer.h
//  Contents:   NullPointer class, signalling an invalid Object
//  Author:     Anthony J H Simons
//  Revised:    29 November 2005

// This software is distributed free in the hope that others will
// find it useful.  However, it comes WITHOUT ANY WARRANTY.  No
// liability can be accepted for software failure, merchantability
// or fitness for a particular purpose.  You can redistribute this
// software in its original form, or in a modified form, provided
// that this disclaimer is retained in the file banner.

#ifndef SCL_NULL_POINTER
#define SCL_NULL_POINTER

#include "ObjectError.h"        // Include my superclass type
#include "NullPointerID.h"      // Include my pointer type

#include "TypeID.h"             // Depend on the pointer type


class NullPointer : public ObjectError {
protected:
        NullPointer(const NullPointer&);
public:
        NullPointer();
        virtual ~NullPointer();
        NullPointer(ObjectID, TypeID);
        NullPointer(ObjectID, ObjectID);
        virtual ObjectID clone() const;
};


inline NullPointerID::NullPointerID() {}

inline NullPointerID::~NullPointerID() {}

inline NullPointerID::NullPointerID(const Null* null) :
        ObjectErrorID(null) {}
        
inline NullPointerID::NullPointerID(const NullPointer* exception) :
        ObjectErrorID(exception) {}
        
inline NullPointerID::NullPointerID(const NullPointerID& pointer) :
        ObjectErrorID(pointer) {}
        
inline NullPointerID& NullPointerID::operator=(const NullPointer* exception) {
        assign(exception);
        return *this;
}

inline NullPointerID& NullPointerID::operator=(const NullPointerID& pointer) {
        assign(pointer);
        return *this;
}


#endif

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