Re: [boost] shared_ptr type_info, void cast

On 5/23/07, Peter Dimov <pdimov@mmltd.net> wrote:

[snip]

struct Base { virtual ~Base() {} };

struct Derived: Base { int i; };

Derived * pd = new Derived; Base * pb = pd; shared_ptr<void> pv( pb );

[snip]

or

pv->pointer() == pd && pv->type() == typeid(Derived);

Sorry if it is too obvious. But how can shared_ptr implement pv->pointer() == pd ? It takes pb from the constructor, it doesnt know anything about Derived.

[snip]

Thanks, -- Felipe Magno de Almeida