Why doesn't iter_swap use swap?

[Martin Sebor]

Daniel Frey wrote:

...
> Maybe I should separate issues more clearly. This first issue is, how 
> std::iter_swap should be implemented. The text of DR 187 suggests that 
> is makes an unqualified call to swap. I think this is intrusive to the 
> user as it activates ADL. I think this should be avoided as we don't 
> have evidence of such behaviour elsewhere in the standard (AFAIK). IMHO 
> the DR should be changed to make clear that iter_swap it meant to make a 
> qualified call to std::swap.

That would be counter to the resolution of issues 225, 226, 229,
detailed in N1523:
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1523.htm

Martin