Re: [Boost-users] noncopyable

Hicham Mouline wrote:

Like this?

class C : public boost::noncopyable { public: ... clone() const { ... } private: C( const C& rhs ) { .... } };

... instance c1 of C exists here ....

What possible return types of clone() const are possible? .A native reference .An auto_ptr

To be honest, I'm not sure myself of how it would be used...

In my experience, the major reason for a clone() function is to allow "virtual copy constructors". struct Base { virtual Base *clone() const = 0; //You might return auto_pointer<Base> or shared_ptr<Base> instead }; struct Derived1 : public Base { Base *clone() const {return new Derived1();} }; struct Derived2: public Base { Base *clone() const {return new Derived2();} };