我如何可以模拟用C OO风格多态性？ [英] How can I simulate OO-style polymorphism in C?

问题描述

有没有写在 C 编程语言OO般code的方法吗？

Is there a way to write OO-like code in the C programming language?

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另请参阅：

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


• http://stackoverflow.com/questions/415452/object-orientation-in-c

通过在[C] OO搜索找到。

Found by searching on "[c] oo".

推荐答案

第一个C ++编译器（带类的C）实际上会生成C code，所以这是绝对可行的。

The first C++ compiler ("C with classes") would actually generate C code, so that's definitely doable.

基本上，你的基类是一个结构;衍生结构必须包括在第一位置的基结构，从而使指针的衍生的结构也将是一个有效的指针到基座结构

Basically, your base class is a struct; derived structs must include the base struct at the first position, so that a pointer to the "derived" struct will also be a valid pointer to the base struct.

typedef struct {
   data member_x;
} base;

typedef struct {
   struct base;
   data member_y;
} derived;

void function_on_base(struct base * a); // here I can pass both pointers to derived and to base

void function_on_derived(struct derived * b); // here I must pass a pointer to the derived class

该功能可以是结构的函数指针的一部分，所以，像P->调用（P）语法成为可能，但你还是要明确地传递一个指针结构函数本身。

The functions can be part of the structure as function pointers, so that a syntax like p->call(p) becomes possible, but you still have to explicitly pass a pointer to the struct to the function itself.

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