On Fri, 27 Mar 2009, Bron Gondwana wrote:
l->tail = l->tail->next = n;
Is that _guaranteed_ to evaluate correctly? It looks like someone
being a smartarse to avoid writing:
l->tail->next = n;
l->tail = l->tail->next;
It's a fairly common idiom for managing linked lists in C.
Or at least I thought that it was a fairly common idiom: the only other
obvious incidences I can find in Cyrus are sync_support.c, make_md5.c and
make_sha1.c, which are probably all down to me. Smartarse.
'=' has right to left associativity (K&R second edition, page 53), so:
a = b = c
evaluates as:
a = (b = c)
But if you are happier with two or three lines of code, then go for it.
--
David Carter Email: david.car...@ucs.cam.ac.uk
University Computing Service, Phone: (01223) 334502
New Museums Site, Pembroke Street, Fax: (01223) 334679
Cambridge UK. CB2 3QH.
