Re: [Boost-users] [mpl] Reconstructing an mpl::list from mpl::l_item's.

Subject: Re: [Boost-users] [mpl] Reconstructing an mpl::list from mpl::l_item's.
From: Dave Abrahams (dave_at_[hidden])
Date: 2010-08-19 16:34:10

Sent from my iPhone

On Aug 19, 2010, at 10:19 AM, AJG <plus.ajg_at_[hidden]> wrote:

> Using mpl::remove, et al. I can eliminate types from an mpl::list. However, it 
> appears that the result is not an actual mpl::list, but some sort of indexed, 
> cons-like structure composed of mpl::l_item types. Is there a way to recreate an 
> mpl::list proper using these l_item's?
> 
> E.g.
> 
> typedef mpl::list<foo, bar, qux> L;
> typedef mpl::remove<L, bar>::type R;
> typedef mpl::???<R>::type => mpl::list<foo, qux>;

Not really. That type with the l_items acts just like list. In general with MPL you can't count on the exact types of sequences and integer constants. 

HTH

Dave Abrahams
BoostPro Computing