singleton.h

#ifndef SINGLETON_H
#define SINGLETON_H

template<class T>
class singleton
{
public:
	static T* instance()
	{
		return m_instance ? m_instance : (m_instance = new T);
	}

protected:
	singleton();
	~singleton();

private:
	singleton(singleton  const&);
	singleton& operator=(singleton const&);
	static T* m_instance;
};

template <class T> T* singleton<T>::m_instance = nullptr;

#endif