小猫与小狗

dog.h

注:狗的结构体是继承了动物的结构体,当然也在这里定义了狗的动作(叫)这个类型


#ifndef DOG_H__


#define DOG_H__




#include "animal.h"




typedef struct dog_t Cdog ;






struct dog_t...{


Canimal super;


};






typedef struct...{


void (* bark)(Cdog *this);


}dog_vmt;




void dog_Init(Cdog* this);


void dog_Bark(Cdog* this);




#endif

dog.c

狗叫的实体函数付值

在初始化的时候将狗的动作付给狗实体,也就是传入


#include "dog.h"


#include <stdio.h>






static const dog_vmt vmt = ...{dog_Bark};






void dog_Init(Cdog* this)...{


animal_Init(this);


this->super.vmt = (const animal_VMT*)&vmt;


}






void dog_Bark(Cdog* this)...{


// fprinf(stdout, "wangwang ");


}



cat.h


#ifndef CAT_H__


#define CAT_H__




#include "animal.h"




typedef struct cat_t Ccat;






typedef struct cat_t...{


Canimal super;


};






typedef struct ...{


void (*bark)(Ccat* this);


}cat_vmt;




void cat_Init(Ccat* this);


void cat_Bark(Ccat* this);




#endif

cat.c


#include "cat.h"


#include <stdio.h>






static const cat_vmt vmt = ...{ cat_Bark };






void cat_Init(Ccat* this)...{


animal_Init(this);


this->super.vmt = (const animal_VMT*)&vmt;


}






void cat_Bark(Ccat* this)...{


fprintf(stdout, "miaomiao ");


}



animal.h


#ifndef ANIMAL_H__


#define ANIMAL_H__




typedef struct animal_t Canimal;






typedef struct ...{


void (*bark)(Canimal* this);


}animal_VMT;






struct animal_t...{


animal_VMT* vmt;


};




void animal_Init(Canimal* this);


void animal_Bark(Canimal* this);




#define animal_Bark(this)


(((Canimal*)(this))->vmt->bark((Canimal*)this))




#endif

animal.c


#include "animal.h"






void animal_Init(Canimal* this)...{








}

main.c


#include "dog.h"


#include "cat.h"


#include "animal.h"








int main()...{


Ccat neko;


Cdog yinu;




dog_Init((Canimal*)&yinu);


cat_Init((Canimal*)&neko);




animal_Bark((Canimal*)&neko);


animal_Bark((Canimal*)&yinu);




return 0;




}