Singleton.h

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#pragma once 

#include <assert.h>

template<typename T>
class Singleton {
    static bool exists;
public:
    Singleton() {
        assert( (not exists) && "*** You have tried to create more than one instance of a Singleton class.");
        exists = true;
    }
    
};

template<typename T> bool Singleton<T>::exists = false;