swap() macro

[Allan Black]

In article <1201 at brl-smoke.ARPA> Schauble at MIT-MULTICS.ARPA writes:
>Can someone construct a version that makes
>    int *a, *b;
>    swap (*a++,*b++);
>work right?

#define swap(p,q) {int *x = &(p), *y = &(q); int z = *x; *x = *y; *y = z;}

This will only work for type 'int'; if you want to make it more general, try
something like:
{long *x = (long)(&(p)) etc.
But be careful with something like that - there's no typechecking, so you
can easily mix pointers up, with disastrous results!

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