求大神帮我看下，这个问题我困扰了半个月

头文件1 dynbase.h

#ifndef   _DYNBASE_H_
#define   _DYNBASE_H_

#include <map>
#include <string>
using namespace std;

typedef void* (*CREATE_FUNC)();


class DynCreateFactory {
public:
	/* ----- 从map容器中得到响应的形状 ----- */
	static void* CreateShape(const string& name);
	/* ----- 运行时动态创建各类形放入map容器 ----- */
	static void registes(const string& name, CREATE_FUNC func);
private:
	static map<string, CREATE_FUNC> cls_;
};

/* ----- 利用构造函数自动调用DynCreateFactory中的registes函数 ----- */
class RegistObj {
public:
	RegistObj(const string& name, CREATE_FUNC func);
};

/* ----- 利用宏定义在main前创建工厂 ----- */
#define CREATE_OBJ(class_name) \
class class_name##Registe { \
public: \
	static void* Instance() { \
		return new class_name; \
    } \
private: \
	static RegistObj reg_; \
}; \
RegistObj  class_name##Registe::reg_(#class_name, class_name##Registe::Instance)

#endif // _DYNBASE_H_




头文件2 shape.h

#ifndef   _SHAPE_H_
#define   _SHAPE_H_

#include "dynbase.h"
#include <iostream>
using namespace std;

class Shape {
public:
	virtual void Draw() = 0;
	virtual ~Shape() {}
};

class Circle : public Shape {
public:
	virtual void Draw();
	~Circle();
};

class Rectangle : public Shape {
public:
	virtual void Draw();
	~Rectangle();
};

class Square : public Shape {
public:
	virtual void Draw();
	~Square();
};

#endif // _SHAPE_H_ 






源文件1 dynbase.cpp

#include "dynbase.h"

map<string, CREATE_FUNC> DynCreateFactory::cls_;

void* DynCreateFactory::CreateShape(const string& name) {
	map<string, CREATE_FUNC>::iterator it;

	it = cls_.find(name);
	if (it == cls_.end())
		return 0;
	else
		return it->second();
}

void DynCreateFactory::registes(const string& name, CREATE_FUNC func) {
	cls_[name] = func;
}

RegistObj::RegistObj(const string& name, CREATE_FUNC func) {
	DynCreateFactory::registes(name, func);
}





源文件2 shape.cpp

#include "shape.h"

void Circle::Draw() {
	cout << "Circle::Draw()" << endl;
}
Circle::~Circle() {
	cout << "~Circle()" << endl;
}

void Rectangle::Draw() {
	cout << "Rectangle::Draw()" << endl;
}

Rectangle::~Rectangle() {
	cout << "~Rectangle()" <<endl;
}

void Square::Draw() {
	cout << "Square::Draw()" <<endl;
}

Square::~Square() {
	cout << "~Square()" << endl;
}

CREATE_OBJ(Circle);
//CREATE_OBJ(Rectangle);
//CREATE_OBJ(Square);





源文件3 main.cpp

#include "shape.h"

int main(void) {
	Shape* sp = (Shape*)DynCreateFactory::CreateShape("Circle");
	sp->Draw();
	delete sp;

	return 0;
}