Re: [boost] Re: Re: Re: Proposals:p2moffsets,prebuild<>,squad_ptr<>(ofcourse)

From: Peter Dimov (pdimov_at_[hidden])
Date: 2002-09-02 09:50:58

From: "Eric Woodruff" <Eric.Woodruff_at_[hidden]>
> Yes, of course, I implemented it with operator shared_ptr<T> () const. The
> problem is this:
>
> shared_ptr<AbstractType> someMethod () {
>     return New<ConcreteType> (p1, p2, p3);
> }

You can use

template<class Y> operator shared_ptr<Y>() const;

but actually it seems to me that the above should work even with a
non-templated operator. This is the auto_ptr_ref idiom that somehow manages
to sneak two user-defined conversions:

auto_ptr<X> someMethod()
{
    return auto_ptr<X>(new X);
}

goes through operator auto_ptr_ref(). Of course some compilers frown at it.