Re: Why doesn't iter_swap use swap?

[Daniel Frey <daniel dot frey at aixigo dot de>]

chris wrote:
> Hello,
>
> I suspect this might have a simple answer, but why doesn't iter_swap use 
> swap? I can't see any immediate disadvantages to this, and it would have 
> the major advantage that any specialisations of swap would then be used 
> by iter_swap (which is how I discovered the problem, while trying to 
> overload swap and then wondering why it wasn't getting used by reverse 
> and other algorithms...)
>
> Chris

I'm currently discussing the same problem (swap, iter_swap and DR 187) 
with some Boost folks. While it looks promising at first that iter_swap 
uses ADL to find specializations, it is also intrusive for the user as 
he can no longer protect calls from ADL by qualifying them. Also, if a 
qualified call to iter_swap uses ADL internally, why doesn't a qualified 
call to swap uses ADL, too? Technically it's possible, Howard Hinnard 
already tried it out in the Metrowerks STL. We are still undecided 
whether or not this is a good idea.

Regards, Daniel

--
Daniel Frey

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