用C语言模拟面向对象

 这个代码是修改自lwoopc，截取其中一部分，然后添加一部分。

在VC6.0和gcc可编译，大家可以从程序代码中的"//文件开始部分"开始看

CTOR是构造，DTOR是析构

#include <stdio.h>#include <malloc.h>#define CLASS(type)          \typedef struct type type;           \type* type##_new( );\void type##_ctor(type* t);      \void type##_dtor(type* t);      \void type##_delete(type* t);        \struct type#define CTOR(type,sencentes)\  type* type##_new() {\  struct type *cthis;\  cthis = (struct type*)malloc(sizeof(struct type));\  if(!cthis)\  {\   return 0;\  }\  type##_ctor(cthis);\  return cthis;\ }\\void type##_ctor(type* cthis) {sencentes;}             #define DTOR(type,sencentes)\void type##_delete(type* cthis)\{\        type##_dtor(cthis);\free(cthis);\}\void type##_dtor(type* cthis){sencentes;}   #define SET(name,value) ( cthis -> name ) = (value)#define FUN(retType,funName) retType(* funName)#define CONNECT(funName) ( cthis -> funName ) = (& _##funName)#define INCALL(funName)  (* cthis->funName)//在成员函数内调用其他函数#define CALL(this,funName) (* this->funName)//文件开始部分void _coutSome(char * str)//在原来函数名前加上_，和CONNECT宏相关{printf("%s\n",str);}//haha 类CLASS(haha){//声明type##_new()和type##_ctor() 和 type##_delete()和type##_dtor() 函数#define MEMhaha int a;\int b;FUN(void,coutSome)();//没定义在MEMhaha里面，表示自己专用的MEMhaha};CTOR(haha,SET(a,10);  SET(b,5);  CONNECT(coutSome))//定义type##_new()和type##_ctor()函数    括号内第二个参数中的语句用;号隔开DTOR(haha,SET(a,0);  INCALL(coutSome) ("dtoring..."))//定义type##_delete()和type##_dtor()函数    括号内第二个参数中的语句用;号隔开//wuwu 类，只有部分成员继承于haha，构造和析构等不继承，因为担心内存地址错误【继承后的排布不同】CLASS(wuwu){ #define MEMwuwu MEMhaha \char c;MEMwuwu};CTOR(wuwu, printf("I am ctoring...\n");   SET(a,10);   SET(c,'w') )//语句用;号隔开DTOR(wuwu, printf("I am dtoring...\n");           SET(a,0) ;    SET(c,'?') )//erer 类，和wuwu一模一样，但是本身只是把wuwu中的成员链接过来CLASS(erer) {#define MEMerer MEMwuwu};CTOR(erer, printf("I am ctoring...\n");   SET(a,10);   SET(c,'w') )//语句用;号隔开DTOR(erer, printf("I am dtoring...\n");   SET(a,0) ;            SET(c,'?') )void main(){// 需要自己new和delete哦，C语言只能先定义后使用，所以下面几行必须放在最开始wuwu *w;haha *h;erer *e;printf("\n\n\n");h = haha_new();CALL(h,coutSome)("newed");printf("new:%d\n",h->a);printf("new:%d\n",h->b);h->a  = 100;printf("set value:%d\n",h->a);haha_delete(h);//testprintf("delete:%d\n",h->a);//testprintf("\n\n\n");w = wuwu_new();//继承printf("new:%d\n",w->a);printf("new:%c\n",w->c);w->a  = 100;w->c  = 'c';printf("set value:%d\n",w->a);printf("set value:%c\n",w->c);wuwu_delete(w);//test，这个正常情况下不被调用printf("dtor:%d\n",w->a);printf("dtor:%c\n",w->c);printf("\n\n\n");e = erer_new();printf("new:%d\n",e->a);printf("new:%c\n",e->c);e->a  = 100;e->c  = 'c';printf("set value:%d\n",e->a);printf("set value:%c\n",e->c);erer_delete(e);printf("dtor:%d\n",e->a);//testprintf("dtor:%c\n",e->c);printf("\n\n\n");}