简单单体模板类的实现（非线程安全）

直接上代码

#ifndef _SINGLETON_H_#define _SINGLETON_H_template <typename T>class CSingleton{public:static T *instance() {static T *_instance = NULL;if (_instance == NULL)_instance = new T();return _instance;}protected:CSingleton() {}CSingleton(const CSingleton&);CSingleton& operator =(const CSingleton&);};#endif // _SINGLETON_H_

#include <QtCore>#include "singleton.h"class CFactory : public CSingleton<CFactory>{public:void setData(const QString &data) { m_data = data; }QString data() { return m_data; }public:QString m_data;};int main(int argc, char *argv[]){QCoreApplication app(argc, argv);  CFactory::instance()->setData("11111");  QString temp = CFactory::instance()->data();return app.exec();}