JCOOP入门指南[04]
OOC-Embeded_C语言模拟对象的应用

C语言模拟OO机制的再研究

pingf posted @ Fri, 27 Aug 2010 06:00:38 -1100 in C语言 with tags 创作 研发 , 3730 readers

因为过一段日子可能又要写些单片机上的代码,所以难免还是离不开C.

以前研究过GObject,也自己用宏写过一些模拟OO的东西,不过这些用在单片机上就不那么顺了.....

于是就想把OO的思想进一步简化,

最和新的东西无非就是类的声明(设计),构造与析构,

所以浓缩了下面的代码,并保证在Keil这类工具上0警告编译通过....

/**
 * OOC-Embeded [Jcoop elite version]
 * version : 0.2.0827elite
 * status  : beta 
 * author  : Jesse Meng 
 * Blog    : http://www.pingf.me 
 * E-mail  : pingf0@gmail.com 
 */


#ifndef __JC_OOP__
#define __JC_OOP__
#include <stdio.h>
#include <stdlib.h>
 
#ifdef BUILD_DLL
/* DLL export */
#define EXPORT __declspec(dllexport)
#elif   defined BUILD_WITH_DLL  
/* EXE import */
#define EXPORT __declspec(dllimport)
#else
#define EXPORT
#endif

#define USE_HEAP_FOR_CLASS
 
#ifdef USE_CALLOC_FOR_CLASS
#define _CLASS_ALLOC(this,Type) \
this=(struct _##Type *)malloc(sizeof(struct _##Type));  
#else
#define _CLASS_ALLOC(this,Type) \
this=(struct _##Type *)calloc(1,sizeof(struct _##Type));  
#endif 

/////////////////////////////////////////////////////////////
#ifdef USE_HEAP_FOR_CLASS
#define _CLASS(Type) \
typedef struct _##Type Type; \
EXPORT int init##Type(struct _##Type * z); \
EXPORT int fin##Type(struct _##Type *z); \
EXPORT struct _##Type * new##Type(void); \
EXPORT int del##Type(struct _##Type **z); \
struct _##Type \
{
//
#define _END_CLASS };
//////////////////////////////////////
#define _CTOR(Type) \
EXPORT struct _##Type * new##Type(void) \
{ \
	struct _##Type *this; \
	int initRet=0; \
	_CLASS_ALLOC(this,Type); \
	if( NULL==this ) { \
        return NULL; \
    } \
	initRet=init##Type(this); \
	if(initRet<0) { \
        return NULL; \
    } \
	return this; \
} \
EXPORT int init##Type(struct _##Type * z) \
{  \
	struct _##Type * this=NULL;\
	this=(struct _##Type *)z; \
	if( NULL==this ) { \
        return -1; \
    }  
        
//
#define _END_CTOR \
	return  1; \
} 
//
#define _DTOR(Type) \
EXPORT int del##Type(struct _##Type **z) \
{ \
	struct _##Type **this = NULL; \
	int finRet=0; \
	this=(struct _##Type **)z;  \
	if(NULL==this) { \
        return -1; \
    } \
	finRet=fin##Type(*this); \
	if(finRet<0) {\
        return -1; \
    } \
	free(*this); \
	(*this)=NULL; \
	return 1; \
} \
EXPORT int fin##Type(struct _##Type *z) \
{ \
	struct _##Type * this=NULL; \
	this=(struct _##Type *)z; \
	if( NULL==this ) { \
        return -1; \
    } 
//  
#define _END_DTOR \
return 1; \
}
#else
#define _CLASS(Type) \
typedef struct _##Type Type; \
EXPORT int init##Type(struct _##Type * z); \
EXPORT int fin##Type(struct _##Type *z); \
struct _##Type \
{
//
#define _END_CLASS };
//////////////////////////////////////
#define _CTOR(Type) \
EXPORT int init##Type(struct _##Type * z) \
{  \
	struct _##Type * this=NULL;\
	this=(struct _##Type *)z; \
	if( NULL==this ) { \
        return -1; \
    }  
        
//
#define _END_CTOR \
	return  1; \
} 
//
#define _DTOR(Type) \
EXPORT int fin##Type(struct _##Type *z) \
{ \
	struct _##Type * this=NULL; \
	this=(struct _##Type *)z; \
	if( NULL==this ) { \
        return -1; \
    } 
//  
#define _END_DTOR \
return 1; \
}
#endif 
 
/////////////////////////////////////////////////////////////
#define CLASS(Type) _CLASS(Type)
#define END_CLASS _END_CLASS 
//
#define CTOR(Type) _CTOR(Type)
#define END_CTOR _END_CTOR
//
#define DTOR(Type) _DTOR(Type)
#define END_DTOR _END_DTOR
//
#endif

因为定义的东西少[也就100多行吧],所以使用起来就容易,省去了很多要记忆的东西,

下面是用例测试

#include <stdio.h>
#include "jc_oop.h"


CLASS(Test)
    int a;
    int b;
END_CLASS

CTOR(Test)
    printf("Test constructor");
    //this->a=1;
    //this->b=2;
END_CTOR
//
DTOR(Test)
    printf("Test destructor");
    this->a=this->b=0;
END_DTOR

int main (int argc, char *argv[])
{
    Test stk;
    Test * heap=NULL;
    heap=newTest();
    delTest(&heap);
    initTest(&stk);
    finTest(&stk);
    return(0);
}

别看这么简单,但是像继承和组合的关系还是可以表示清楚的

比如下面测试了组合关系

 

#include <stdio.h>
#include "jc_oop.h"


CLASS(Test)
    int a;
    int b;
END_CLASS

CTOR(Test)
    printf("Test constructor\n");
    //this->a=1;
    //this->b=2;
END_CTOR
//
DTOR(Test)
    printf("Test destructor\n");
    this->a=this->b=0;
END_DTOR

CLASS(Test2)
    Test *test;
END_CLASS

CTOR(Test2)
    printf("Test2 constructor\n");
    this->test=newTest();
END_CTOR
//
DTOR(Test2)
    printf("Test2 destructor,actually this is after Test\n");
    delTest(&(this->test));
END_DTOR

int main (int argc, char *argv[])
{
    Test stk;
    Test2 * heap=NULL;
    heap=newTest2();
    delTest2(&heap);
    return(0);
}

至于像方法之类的东西,自然还是用函数指针来模拟,

为了在嵌入式系统上使用方便,不再用宏来定义

Avatar_small
纵横天下 said:
Sat, 30 Oct 2010 05:53:46 -1100

牛人,不过好像没有成员函数

Avatar_small
pingf said:
Sat, 13 Nov 2010 13:55:08 -1100

成员函数用函数指针模拟,
另外关于这这样的宏我后来又做了一些其他的尝试,比如完成了一些常用的数据结构[比如哈希表神马的]
比如像C++那样也整一个虚表[当然还是用函数指针模拟,不过指向堆空间罢了],这样的话在使用时可能麻烦了些,
但是在类的继承以及类型转换时会有些额外的好处,
这段时间要复习考研,以后有时间在传到网上

Avatar_small
pingf said:
Tue, 16 Nov 2010 05:46:15 -1100

@纵横天下:
最近还是更新了下,舍弃了"虚表"的方法,还是因为用起来不方便
有兴趣的话看下下面的v0.6那个
http://code.google.com/p/ooc-embeded/downloads/list

xiaoao360 said:
Sun, 01 Jan 2012 04:23:21 -1100

http://code.google.com/p/ooc-embeded/downloads/list
这个网址我上不去,请问怎么能看到这里的代码?

pingf said:
Sun, 01 Jan 2012 15:35:49 -1100

http://code.google.com/p/ooc-lite/downloads/list

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