Inheritable singleton class in C++

singleton.h

#pragma once
 
#include<iostream>
#include<cstdlib>
 
template<typename T>
class Singleton
{
public:
    inline static T& getInstance()
    {
            static T instance;
            return instance;
    }
 
protected: 
    Singleton() {};
    Singleton(const Singleton&) {};
    ~Singleton() {};
};