animal.h

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#pragma once

typedef struct {
    char name[10];   
    char sound[10];  
} Animal_Attr;

typedef struct {
    int (*init)(void* t, Animal_Attr attr);

    int (*get_name)(void* t, char* name);

    int (*speak)(void* t);
} ANIMAL_CLASS_IMPLEMENTS;

typedef struct {
    ANIMAL_CLASS_IMPLEMENTS api;  
    Animal_Attr attr;             
} ANIMAL_CLASS;

typedef struct {
    char name[10]; 
} Dog_Attr;

typedef struct {
    ANIMAL_CLASS_IMPLEMENTS api; 
    Dog_Attr attr;               
} DOG_CLASS;

typedef struct {
    char name[10]; 
} Cat_Attr;

typedef struct {
    ANIMAL_CLASS_IMPLEMENTS api; 
    Cat_Attr attr;               
} CAT_CLASS;

ANIMAL_CLASS* ANIMAL_CLASS_CTOR(void);

void ANIMAL_CLASS_DTOR(ANIMAL_CLASS* t);

DOG_CLASS* DOG_CLASS_CTOR(ANIMAL_CLASS_IMPLEMENTS* t);

void DOG_CLASS_DTOR(DOG_CLASS* t);

CAT_CLASS* CAT_CLASS_CTOR(ANIMAL_CLASS_IMPLEMENTS* t);

void CAT_CLASS_DTOR(CAT_CLASS* t);