[boost] Re: rebind<> bad; template template good

From: Aleksey Gurtovoy (agurtovoy_at_[hidden])
Date: 2002-10-04 20:21:36

David B. Held wrote:
> > [...]
> >     template <
> >           typename T
> >         , typename OwnershipPolicy
> >         , typename ConversionPolicy
> >         , typename CheckingPolicy
> >         , typename StoragePolicy
> >         , typename sp_ = typename apply<StoragePolicy,T>::type
> >     >
> >     struct smart_ptr
> >         : sp_
> >         , apply<OwnershipPolicy, typename sp_::pointer_type>::type
> >         , apply<CheckingPolicy, typename sp_::pointer_type>::type
> 
> I assume these are mpl::apply<>?  

Yep.

[...]

> However, I notice that in one place, you used apply<>, and another,
apply1<>.  
> Is apply<> a generic wrapper for any arity, and apply1<> a specialized
version 
> for just one argument?

Yep, exactly that.

> > Well, I hope the above clarifies things a little bit.
> 
> Yes, it is excellent.  I think I understand mpl::lambda enough to
integrate
> it with the smart pointer.  Thanks a lot for the tutorial.  

You are welcome!

Aleksey