swap() macro

[Daniel R. Levy]

In article <370 at anasazi.UUCP>, steve at anasazi.UUCP (Steve Villee) writes:
>> Can someone construct a version that makes
>>
>>     int *a, *b;
>>     swap (*a++,*b++);
>>
>> work right?
>>           Paul Schauble at MIT-Multics.arpa
>
>#define swap(x, y) \
>  if (1) \
>  { \
>    register int *xp, *yp, t; \
>    xp = &(x); \
>    yp = &(y); \
>	...
>--- Steve Villee (ihnp4!mot!anasazi!steve)

CAUTION.  This will fail on:

	register int i, j;
	swap(i,j);
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