   [C++] Smart Pointers with Polymorphic Objects
  I intend to Store Objects of a derived Class as pointers to the Base Class, in a shared_ptr. Does this mean that I need a virtual Destructor in the Base?   
  Yes. In general, any class with virtual functions should have a virtual destructor. I would only be tempted to remove the virtual destructor if I had overwhleming proof that it was causing performance issues.Such a scenario is extremely unlikely, and probably has more macro-optimisation opportunities available - you would have to be allocating them at a ferocious rate and allocation is also expensive.   ;  Yes.   ;Quote:Original post by hiigaraI intend to Store Objects of a derived Class as pointers to the Base Class, in a shared_ptr. Does this mean that I need a virtual Destructor in the Base?You should.But actually boost::shared_ptr is in fact written in such a way that it isn't necessary, provided the shared_ptr is constructed in the correct manner.Its constructor looks like this:template<class T> class shared_ptr {    public: template<class Y> explicit shared_ptr(Y * p);// ...};So if you were to do the following, shared_ptr is actually smart enough to call the destructor of the derived class.shared_ptr<Base> p(new Derived);You can read the implementation to find out why and how this works (it's related to the fact that shared_ptrs have "deleter" objects and a default deleter will be based on the type of Y given to the constructor).However, this isn't true for smart pointers in general so I wouldn't rely on it. Add a virtual destructor.   