Re: [boost] shared_ptr type_info, void cast

26 May 2007


      Felipe Magno de Almeida wrote:
...
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 can use dynamic_cast<void*>( pb ) to obtain pd when *pb is polymorphic.