C++ 通过一个字符串来创建一个已有的类对象

最新推荐文章于 2022-02-08 10:01:25 发布

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最新推荐文章于 2022-02-08 10:01:25 发布 · 627 阅读

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CC 4.0 BY-SA版权

#include <iostream>
#include <string>
#include <map>
using namespace std;
typedef void* (*pCreateObject)(void);
class ClassFactory
{
private:
	map<string, pCreateObject> m_classMap;
	ClassFactory() {};

public:
	void* CreateObjectByName(string className)
	{
		map<string, pCreateObject>::const_iterator iter;
		iter = m_classMap.find(className);
		if (iter == m_classMap.end())
			return NULL;
		else
			return iter->second(); //函数指针的调用
	}
	void registClass(string name, pCreateObject method)
	{
		m_classMap.insert(pair<string, pCreateObject>(name, method));
	}
	static ClassFactory& getInstance()
	{
		{
			static ClassFactory cf;
			return cf;
		}
	}
};

template <typename T>
T* createObj(void)
{
	return new T;
}

class RegisterAction {
public:
	RegisterAction(string className, pCreateObject ptrCreateFn) {
		ClassFactory::getInstance().registClass(className, ptrCreateFn);
	}
};

#define REGISTER_CLASS(className