[C] 如何利用C来实践OOP

最新推荐文章于 2024-09-10 11:53:49 发布

原创最新推荐文章于 2024-09-10 11:53:49 发布 · 1.8k 阅读

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文章标签：

#c #oop #struct #fun #variables #xcode

本文通过C语言实现了一个简单的面向对象编程(OOP)案例。利用结构体和函数指针模拟了类继承和多态特性，具体包括动物(Animal)基类和狗(Dog)子类的定义与实例化。

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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 access char *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 destructor Animal_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 constructor Animal_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; }