foo.hpp

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template <class T>
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class Singleton
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{
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public:
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  static T* Instance() {
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      if(!m_pInstance) m_pInstance = new T;
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      assert(m_pInstance != NULL);
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      return m_pInstance;
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  }
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protected:
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  Singleton();
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  ~Singleton();
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private:
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  Singleton(Singleton const&);
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  Singleton& operator=(Singleton const&);
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  static T* m_pInstance;
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};
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template <class T> T* Singleton<T>::m_pInstance=NULL;