参考了wxWidgets的相关代码，并进行简化，同时借鉴了网上的相关内容，改进之处在于，只需要继承基本类Object，在类的头文件中定义宏，DECLARE_CLASS(类名)，在类的实现文件中定义宏，IMPLEMENT_CLASS(类名)，即可，欢迎指正。
代码以来的库都是C++标准库，所以不需要额外添加库。
例如：
代码以来的库都是C++标准库，所以不需要额外添加库。
例如：
#include<iostream>
#include<cstring>
#include "DynBase.h"
using namespace std;
class A : public Object
{
DECLARE_CLASS(A)
public :
A(){cout<<hex<<(long)this<<" A constructor!"<<endl;}
~A(){cout<<hex<<(long)this<<" A destructor!"<<endl;}
};
IMPLEMENT_CLASS(A)
class B : public Object
{
DECLARE_CLASS(B)
public :
B(){cout<<hex<<(long)this<<" B constructor!"<<endl;}
~B(){cout<<hex<<(long)this<<" B destructor!"<<endl;}
};
IMPLEMENT_CLASS(B)
int main()
{
Object* p = Object::CreateObject("A");
delete p;
system("pause");
return 0;
}
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代码片段(3)[全屏查看所有代码]
1. [文件] DynBase.cpp ~ 781B 下载(284)
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#include "StdAfx.h"#include <map>#include "DynBase.h" static std::map< string,ClassInfo*> *classInfoMap = NULL;using namespace std;IMPLEMENT_CLASS(Object)bool Object::Register(ClassInfo* ci){ if(!classInfoMap) { classInfoMap = new std::map< string,ClassInfo*>(); } if(ci) { if(classInfoMap->find(ci->m_className) == classInfoMap->end()){ classInfoMap->insert(std::map< string,ClassInfo*>::value_type(ci->m_className,ci)); } } return true;}Object* Object::CreateObject(std::string name){ std::map< string,ClassInfo*>::const_iterator iter = classInfoMap->find(name); if(classInfoMap->end() != iter) { return iter->second->CreateObject(); } return NULL;}bool Register(ClassInfo* ci){ return Object::Register(ci);} |
2. [文件] DynBase.h ~ 1KB 下载(267)
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#ifndef __DYNBASE_H__#define __DYNBASE_H__#include <string>class Object;class ClassInfo;typedef Object* (*ObjectConstructorFn)(void); bool Register(ClassInfo* ci);using namespace std;class ClassInfo{public: ClassInfo(const std::string className,ObjectConstructorFn ctor) :m_className(className) ,m_objectConstructor(ctor) { Register(this); } virtual ~ClassInfo(){} Object* CreateObject()const { return m_objectConstructor ? (*m_objectConstructor)() : 0; } bool IsDynamic()const { return NULL != m_objectConstructor;} const std::string GetClassName()const { return m_className;} ObjectConstructorFn GetConstructor()const{ return m_objectConstructor;}public: string m_className; ObjectConstructorFn m_objectConstructor;};#define DECLARE_CLASS(name) protected: static ClassInfo ms_classinfo; public: virtual ClassInfo* GetClassInfo() const; static Object* CreateObject();#define IMPLEMENT_CLASS_COMMON(name,func) ClassInfo name::ms_classinfo((#name), (ObjectConstructorFn) func); ClassInfo *name::GetClassInfo() const {return &name::ms_classinfo;}#define IMPLEMENT_CLASS(name) IMPLEMENT_CLASS_COMMON(name,name::CreateObject) Object* name::CreateObject() { return new name;}class Object{ DECLARE_CLASS(Object)public: Object(){} virtual ~Object(){} static bool Register(ClassInfo* ci); static Object* CreateObject(string name);};#endif |
3. [文件] test.cpp ~ 579B 下载(236)
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#include<iostream>#include<cstring>#include "DynBase.h"using namespace std;class A : public Object{ DECLARE_CLASS(A)public : A(){cout<<hex<<(long)this<<" A constructor!"<<endl;} ~A(){cout<<hex<<(long)this<<" A destructor!"<<endl;}};IMPLEMENT_CLASS(A)class B : public Object{ DECLARE_CLASS(B)public : B(){cout<<hex<<(long)this<<" B constructor!"<<endl;} ~B(){cout<<hex<<(long)this<<" B destructor!"<<endl;}};IMPLEMENT_CLASS(B)int main(){ Object* p = Object::CreateObject("A"); delete p; system("pause"); return 0;} |