use of if (!cptr) and if (cptr), where cptr is a *

[John Lacey]

In article <10103 at mpx2.mpx.com> erik at mpx2.mpx.com (Erik Murrey) writes:
[Material everybody has seen n times deleted.]
>Perhaps my example was bad.  The above coding method is
>even more useful in while() and for() loops:
>
>while (cc= fgetc(fp), cc != '\n') {
>	/* process more of line */
>	...
>}
>
>or even:
>
>while (myptr= my_func(), myptr->x != myptr->y) {
>	/* ... */
>	...
>}
>
>I would kinda like to see that one in your style...
>

I am kind of butting in [ :-) ], but how 'bout

	while ( (cc = fgetc(fp)) != '\n' )
		{
		:
		}

and 

	while ( ( myptr = my_func() )->x != myptr->y ) 
		{
		:
		}

or even

	for ( myptr = my_func(); myptr->x != myptr->y; myptr = my_func() )
		{
		:
		}

though I use the last most commonly only when the two functions (primer and
`incrementer') are different.

Just a personal beef, maybe, but the comma operator slows me down when I'm
reading code, and these example here don't.

-- 
John Lacey                      |     cornell!batcomputer!lacey
lacey at tcgould.tn.cornell.edu    |     lacey at crnlthry.bitnet