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利用C语言实践OOP,以及new,delete的深入分析

 更新时间：2020年4月25日 17:45  点击：1389
研究了一下,总算勉强能够融会贯通了
c写成OOP还蛮有乐趣的
编译环境:Xcode3.2.3+gcc4.2
复制代码 代码如下:

#ifndef OBJECT_H
#define OBJECT_H
typedef void (*Execute)(struct Object *a_This);
typedef struct Object* (*Allocate)();
typedef struct _Object_Vtable
{
 char *name;
 Execute exe;
}Object_Vtable;
typedef struct _baseCmd
{
 Object_Vtable vtable;
}BaseCmd;
// --- for common --- //
BaseCmd* new(Allocate newObj);
void delete(void * item);
// --------------------------//
// --- for BaseCmd --- //
BaseCmd* NewBaseCmd();
void Exe_BaseCmd(BaseCmd *a_This);
// --------------------------//
// --- for HomeCmd --- //
typedef struct _homeCmd
{
 Object_Vtable vtable;
}HomeCmd;
BaseCmd* NewHomeCmd();
void Exe_HomeCmd(HomeCmd *a_This);
// --------------------------//
#endif

复制代码 代码如下:

#include "Cloud.h"
// --- for common --- //
BaseCmd* new(Allocate newObj)
{
 BaseCmd * obj = newObj();
 return obj;
}
void delete(void * item)
{
 free(item);
}
// --------------------------//
// --- for BaseCmd --- //
BaseCmd* NewBaseCmd()
{
 BaseCmd * cmd = malloc(sizeof(BaseCmd));
 cmd->vtable.name = "Cloud";
 cmd->vtable.exe = Exe_BaseCmd;
 return cmd;
}
void Exe_BaseCmd(BaseCmd *a_This)
{
 printf("do base command = %s/n",a_This->vtable.name);
}
// --------------------------//
// --- for HomeCmd --- //
BaseCmd* NewHomeCmd()
{
 HomeCmd * cmd = malloc(sizeof(HomeCmd));
 cmd->vtable.name = "Home";
 cmd->vtable.exe = Exe_HomeCmd;
 return cmd;
}
void Exe_HomeCmd(HomeCmd *a_This)
{
 printf("do home command = %s/n",a_This->vtable.name);
}
// --------------------------//

复制代码 代码如下:

#include <stdio.h>
#include <stdlib.h>
#include "Cloud.h"
int main (int argc, const char * argv[])
{

 BaseCmd* cmd = new(NewBaseCmd);
 cmd->vtable.exe(cmd);
 delete(cmd);

 BaseCmd* cmd2 = new(NewHomeCmd);
 cmd2->vtable.exe(cmd2);
 delete(cmd2);

    return 0;
}

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