Re: [boost] [Range] initial feedback on return values of algorithms

From: Thorsten Ottosen (tottosen_at_[hidden])
Date: 2006-02-05 10:40:12

David Abrahams wrote:
> Thorsten Ottosen <tottosen_at_[hidden]> writes:
> 
> 
>>>No, that's not the same thing at all.  Read what I wrote again.
>>
>>ok, so we could return a tripple {begin,found,end}.
> 
> 
> I said quadruple.  I meant {begin,found,found+1,end}.

why do you want to store found+1 when you can compute it on demand?

>>this means that
>>
>>1. we loose the benefit of a default
> 
> 
> The default might be a different function.  In fact it would be in
> your case, too, since you can't deduce an explicit template argument
> from a default value.

there's a core issue that allows default function template arguments.
(not that we can make use of that today)

>>2. a slight overhead (the tripple construction cannot be optmized away)
> 
> 
> How do you know?
> 
> The compiler can optimize anything it wants as long as it doesn't
> change the observable behavior.

Ok, cannot is the wrong word here. It still think it's unrealistic to
expect it though.

-Thorsten