#pragma once
template<class T>
class SingletonBase{
protected:
	SingletonBase(){};
public:
	SingletonBase(const SingletonBase&) = delete;
	SingletonBase operator=(const SingletonBase&) = delete;	
	static T& instance(){
		static T single; //no need for DCLP since C++11 (paragraph 6.7.4, static initialization)
		return single;
	}
};