Re: [boost] [MPL] Potential use for multiple sequence types

From: Douglas Gregor (gregod_at_[hidden])
Date: 2002-08-01 22:06:51

On Thursday 01 August 2002 04:07 pm, Emily Winch wrote:
> > Maybe Mike has some data on this for us. They might have tried cons-style
> > lists.
>
> I don't think they did, but I could be wrong.

Nope, they didn't.

> We do need to do that. And we can, without requiring any kind of type
> list to do so. I think we may be hooked up by my use of type list/value
> list: by type list I meant a list that _doesn't_ carry values. I suppose
> that's misleading, since the value list is really intrinsically a type
> list also.
>
> So: Mike B. doesn't need a vector-based typelist (without values) in
> order to access types in his vector-based value list. Thus, just because
> someone needs a vector-based value list, doesn't imply the MPL should
> contain a vector-based non-value typelist.

I see your point here, that in the example I gave there is no pressing need to 
work on just the types in the value list. 

> I think I need a better set of terminology :)

I got very confused by the phrase "vector-based typelist" , but I think I get 
it now :) Maybe "vector-based type sequence" would have helped, so that I 
wouldn't be envisioning a cons-style typelist right after reading 
'vector-based'...

        Doug