Swapping two variables in place

[Scott Horne]

In article <26101 at shamash.cdc.com> awm at shamash.UUCP (Allan Magnuson) writes:
>There was a message a while back about not being able to create a good
>#define function to swap two variables.
>
>How about this one: #define swap(a,b) a^=b^=a^=b

I prefer

#define ___(_,__)(_^=__^=_^=__)

It's delightfully difficult to read, isn't it?  :-)  "Oh, that?  It swaps
variables.  Can't you tell?"  :-)

But it won't work on `float's and `double's, as `^' is defined only on
integral types.

					--Scott

-- 
Scott Horne                               ...!{harvard,cmcl2,decvax}!yale!horne
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