Prevent Inheritance from a Base Class

Use code such as this to prevent subclasses from deriving from a base class:

class myclass;	class my_lock {		friend class myclass;	private:		my_lock() {}		my_lock(const my_lock&) {}	};	class myclass : public virtual my_lock {		// ...	public:		myclass();		myclass(char*);		// ...	};	myclass m;	class Der : public myclass { };	Der dd;  // error Der::dd() cannot access        	// my_lock::my_lock(): private  member
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