用C结构体来实现面向对象编程，ti xDAIS标准算法就这么搞的
用C结构体来实现面向对象编程，ti xDAIS标准算法就这么搞的。
测试代码如下：
#include <stdio.h>#include <stdlib.h>#include <string.h>typedef struct Alg_Obj{struct Alg_Fxn* fxns;}Alg_Obj;typedef Alg_Obj *Alg_Handle;typedef struct Alg_Fxn{void (*process)(Alg_Handle handle);void (*control)(Alg_Handle handle);}Alg_Fxn;void Alg_process(Alg_Handle handle){handle->fxns->process(handle);printf("in Alg_process.. \n");}void Alg_control(Alg_Handle handle){handle->fxns->control(handle);printf("in Alg_control.. \n");}struct triangle{Alg_Handle handle;int a;int b;int c;};void tri_process(Alg_Handle handle){struct triangle *t = (struct triangle*)handle; int a = t->a;int b = t->b;int c = t->c;printf(" [in tri_process] sum=%d\n",a+b+c);}void tri_control(Alg_Handle handle){struct triangle *t = (struct triangle*)handle; int a = t->a;int b = t->b;int c = t->c;printf(" [in tri_control] sum=%d\n",(a+b+c)*2);}Alg_Fxn gfxns = {tri_process,tri_control,};int main(){struct triangle *ret = (struct triangle*)malloc(sizeof(struct triangle));ret->handle->fxns=&gfxns;ret->a = 2;ret->b = 3;ret->c = 4;Alg_Handle Handle= (Alg_Handle)ret;//第一种调用，注意结果gfxns.process(Handle);gfxns.control(Handle);printf("\n**********************************\n");//第二种调用，注意结果Alg_process(Handle);Alg_control(Handle);free(Handle);return 0;}/*[root@localhost TestCode]# ./a.out [in tri_process] sum=9 [in tri_control] sum=18********************************** [in tri_process] sum=9in Alg_process.. [in tri_control] sum=18in Alg_control.. */