闲来没事，看了看sqlite的源代码，突然想用c实现c++，写了例如以下demo，自我感觉不错

#include <stdio.h>

#include <stdlib.h>

struct Class;

typedef struct Class _Class;

struct IMethod

{

	void (*ctor)(_Class *c);

	void (*dtor)(_Class *c);

	int (*sum)(_Class* c);

	int (*getValueA)(_Class* c);

	int (*getValueB)(_Class* c);

	void (*setValueA)(_Class*c, int a);

	void (*setValueB)(_Class *c, int b);

};

typedef struct IMethod _IMethod;

typedef struct Class

{

	//数据

	int m_a;

	int m_b;

	//接口

	_IMethod m_method;

} _Class;

int _sum(_Class *c)

{

	return c->m_a+c->m_b;

}

int _getValueA(_Class *c)

{

	return c->m_a;

}

int _getValueB(_Class *c)

{

	return c->m_b;

}

void _setValueA(_Class *c, int a)

{

	c->m_a = a;

}

void _setValueB(_Class *c, int b)

{

	c->m_b = b;

}

void _ctor(_Class *c)

{

	printf("create new _Class\n");

	//初始化数据，构造函数

	c->m_method.sum = &_sum;

	c->m_method.getValueA = &_getValueA;

	c->m_method.getValueB = &_getValueB;

	c->m_method.setValueA = &_setValueA;

	c->m_method.setValueB = &_setValueB;

	c->m_a = 0;

	c->m_b = 0;

}

void _dtor(_Class *c)

{

	printf("delete _Class\n");

	//析构函数

}

//_Class的对象工厂

_Class *newClass()

{

	_Class* obj= (_Class*)malloc(sizeof(_Class));

	_ctor(obj);

	return obj;

}

void deleteClass(_Class * c)

{

	_dtor(c);

	free(c);

}

#define CXX_CALLER(obj, fun,...)\

	obj->m_method.fun(obj, __VA_ARGS__);\

int main(int argc, char *argv[])

{

	_Class *c = newClass();

	int a=0, b=0, sum=0;

	CXX_CALLER(c, setValueA, 100);

	CXX_CALLER(c, setValueB, 200);

// 	c->m_method.setValueA(100);

// 	c->m_method.setValueB(200);

// 	a = c->m_method.getValueA(c);

// 	b = c->m_method.getValueB(c);

// 	sum = c->m_method.sum(c);

	a = CXX_CALLER(c, getValueA);

	b = CXX_CALLER(c, getValueB);

	sum = CXX_CALLER(c, sum);

	printf("a=%d, b=%d, sum=%d\n", a, b, sum);

	deleteClass(c);

	getchar();

	return 0;

}