Re: [Boost-users] [mpl]pop_front function on integral sequence

From: Tobias Schwinger (tschwinger_at_[hidden])
Date: 2007-06-18 13:03:24

Vít Kasal wrote:
> Hi,
> 
> I have a problem with using pop_front on an integral sequence.
> 
> pop_front< vector_c<T, c1, c2, ... cn> >::type
> 
> results in
> 
> vector<c2, ... cn>

Really? It removes two elements - or is that just a typo?

> 
> Is it intended behavior? 

     Returning a 'vector' instead of a 'vector_c'?

Yes, since 'vector_c' is just a "convenience wrapper" to create 'vector's.

     Removing two elements instead of one?

No. That would be a bug.

> Is there some way to get
> 
> vector_c<T, c2, ... cn> >

No. Why do you need it?

You get a Random Access Sequence full of Integral Constants. Treat it as 
such and you don't need to rely on the identity of the template-id.

Regards,
Tobias