As discussed previously on the mailing list with David Abrahams and
Steve Watanabe, I've written a swap function for boost which uses
argument dependent lookup (aka koenig lookup), encapsulating the
idiom:

using std::swap;
swap(a,b);

It can currently be found at
'http://www.josephgauterin.myzen.co.uk/swap.zip' as I don't have SVN
write access.

Currently, I only have access to MSVC8.0 - I'd be grateful if people
with access to other compilers could test this (bjam in the test
directory), in paticular I believe it may not work correctly with gcc
< 3.2 and MSVC6.0.

I'd also be grateful for any comments or constructive criticism.
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