Modern C++ Singleton

#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;
    }
};