Re: [Boost-users] [mpl] a few questions about set and map

From: David Abrahams (dave_at_[hidden])
Date: 2006-07-02 21:38:06

Yuval Ronen <ronen_yuval_at_[hidden]> writes:

> David Abrahams wrote:
>> The default version of front always takes at least two
>> instantiations (begin<...> and deref<...>).  If you can do front in
>> one instantiation and you want the optimization, you'd better
>> specialize it.
>
> If this single instantiation you save is important (which sounds to me 
> like too small a thing to mess with, but if you claim otherwise, I'll 
> take your word for it), 

It's at least a 50% savings, and quite possibly more than 50%.

> then wouldn't you want to specialize 'back' as well as 'front', if
> possible? You might be able save an instantiation there as well...

You might want to do that, yes... "if possible" being key words here.

> Moreover, if this single instantiation saving is important, should it be 
> specialized for *all* sequences, including those already present in mpl?

I don't have an opinion on it, and I don't see where you're going with
that question.

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com