Inheritance/Single/C: Difference between revisions

==Manual Object System==

Although [[C]] is not considered an OO language, you can do the following, which provides a semblance of an OO infrastructure allowing Inheritance and Polymorphism. The original [[C++]] was a front end which translated C++ code to C. (C++ was much simpler in those days.)"

#ifndef _ANIMAL_H

#define _ANIMAL_H

extern Animal ObjClone(Animal a);

extern void ObjDestroy(Animal a);

 

#include "Animal.h"

typedef struct sclass *Class;

extern void ClassRecInit(Class c);

extern void DfltClsInit(Class c);

#include "AnimalProt.h"

 

sClass boc = { sizeof(SObject), "Animal", NULL, &baseClsRecInit,

&baseClone, &baseSpeak, NULL };

 

#include "AnimalProt.h"

 

extern void InitDog(DogPart *dogp, char *name, char *color, double weight);

 

 

/** * * * * * * * * * * * * * * * * * *

* Dog - a class derived from Animal

}

return (Animal)dog;

#ifndef _DOG_H

#define _DOG_H

#include "Animal.h"

extern Animal NewDog(char *name, char *color, double weight);

 

#include "DogProt.h"

/** * * * * * * * * * * * * * * * * * *

};

 

#include "LabProt.h"

 

}

return (Animal)dog;

#include "Dog.h"

 

/** * * * * * * * * * * * * * * * * * *

* Collie - a class derived from Dog

};

 

#include "CollieProt.h"

 

}

return (Animal)dog;

#include "Dog.h"

 

#include "AnimalProt.h"

/* * * * * * * * * * * * */

};

 

#include "CatProt.h"

 

}

 

#include "Animal.h"

 

#include "Lab.h"

#include "Collie.h"

 

return 0;