Re: [boost] Re: Re: intrusive_ptr question

From: Rob Stewart (stewart_at_[hidden])
Date: 2004-05-21 12:11:03

From: "David B. Held" <dheld_at_[hidden]>
> "Rob Stewart" <stewart_at_[hidden]> wrote in message
> > [...]
> > int * p1(0);
> > int const * p2(p1); // OK
> >
> > Notice also that T for instrusive_ptr<T> and for T * is one and
> > the same, so you can't compare intrusive_ptr<T> with T const *.
> > You could only compare intrusive_ptr<T const> with T const *.
> 
> And the problem with that is?

The original query was why the second arg wasn't T const *.  My
point is that comparing with a T * would work because T * can be
converted to T const * implicitly.

The other point is that if you have an instrusive_ptr<int const>,
for example, you cannot compare it with an int *, because the
function template expects the second argument to be of type int
const *.  (Actually, it will just complain about not being able
to infer T since neither int nor int const will work.)

-- 
Rob Stewart                           stewart_at_[hidden]
Software Engineer                     http://www.sig.com
Susquehanna International Group, LLP  using std::disclaimer;