[C] 如何利用C来实践OOP

因为工作上的需要,现在必需要用C来开发崁入式系统的程序

为了增强功力,就顺便学习一下怎么使用C来实践OOP

这个范例是利用Xcode3.2.3+gcc4.2实践的......

跟google找到的范例有点小出入.....

http://stackoverflow.com/questions/351733/can-you-write-object-oriented-code-in-c

 

#include <stdio.h>#include <stdlib.h>typedef void (*Walk_Fun)(struct Animal *a_This);typedef struct Animal * (*Dtor_Fun)(struct Animal *a_This);typedef struct _Animal_Vtable{Walk_Fun Walk;Dtor_Fun Dtor;}Animal_Vtable;typedef struct _Animal{Animal_Vtable vtable;char *Name;}Animal;typedef struct _Dog{Animal_Vtable vtable;char *Name; // mirror member variables for easy accesschar *Type;}Dog;void Animal_Walk(Animal *a_This){printf("Animal (%s) walking/n", a_This->Name);}struct Animal* Animal_Dtor(struct Animal *a_This){printf("animal::dtor/n");return a_This;}Animal *Animal_Alloc(){return (Animal*)malloc(sizeof(Animal));}Animal *Animal_New(Animal *a_Animal){a_Animal->vtable.Walk = Animal_Walk;a_Animal->vtable.Dtor = Animal_Dtor;a_Animal->Name = "Anonymous";return a_Animal;}void Animal_Free(Animal *a_This){a_This->vtable.Dtor(a_This);free(a_This);}void Dog_Walk(Dog *a_This){printf("Dog walking %s (%s)/n", a_This->Type, a_This->Name);}Dog* Dog_Dtor(Dog *a_This){// explicit call to parent destructorAnimal_Dtor((Animal*)a_This);printf("dog::dtor/n");return a_This;}Dog *Dog_Alloc(){return (Dog*)malloc(sizeof(Dog));}Dog *Dog_New(Dog *a_Dog){// explict call to parent constructorAnimal_New((Animal*)a_Dog);a_Dog->Type = "Dog type";a_Dog->vtable.Walk = (Walk_Fun) Dog_Walk;a_Dog->vtable.Dtor = (Dtor_Fun) Dog_Dtor;return a_Dog;}int main (int argc, const char * argv[]) { /* base class: Animal *a_Animal = Animal_New(Animal_Alloc()); */Animal *a_Animal = (Animal*)Dog_New(Dog_Alloc());a_Animal->vtable.Walk(a_Animal);Animal_Free(a_Animal); return 0;}