delorie.com/archives/browse.cgi | search |
X-Authentication-Warning: | delorie.com: mail set sender to djgpp-bounces using -f |
From: | Cesar Rabak <crabak AT acm DOT org> |
Newsgroups: | comp.os.msdos.djgpp |
Subject: | Re: Trouble of using very large arrays |
Date: | Fri, 23 Apr 2004 07:00:45 -0300 |
Lines: | 29 |
Message-ID: | <4088E94D.8070508@acm.org> |
References: | <c68d6j$g57$03$1 AT news DOT t-online DOT com> <c68e70$96gqq$1 AT ID-231750 DOT news DOT uni-berlin DOT de> <c68u9l$9fevb$1 AT ID-79865 DOT news DOT uni-berlin DOT de> <urih80l3b6om4kbblr8jthpjbm1i7cp6gc AT 4ax DOT com> |
NNTP-Posting-Host: | 241132.virtua.com.br (200.182.241.132) |
Mime-Version: | 1.0 |
X-Trace: | news.uni-berlin.de 1082714438 10078972 I 200.182.241.132 ([39218]) |
User-Agent: | Mozilla/5.0 (Windows; U; Windows NT 5.1; pt-BR; rv:1.0.2) Gecko/20030208 Netscape/7.02 |
X-Accept-Language: | pt-br, pt |
To: | djgpp AT delorie DOT com |
DJ-Gateway: | from newsgroup comp.os.msdos.djgpp |
Reply-To: | djgpp AT delorie DOT com |
Brian Inglis escreveu: > On Thu, 22 Apr 2004 20:10:08 +0300 in comp.os.msdos.djgpp, "Alex > Vinokur" <alexvn AT big DOT foot DOT com> wrote: > > >> a = (unsigned int*)malloc (rows * columns * sizeof (unsigned int)); >> > > > Nitpicks: > > -- avoid casting malloc results, as it is unnecessary to cast a void > pointer to any other type of pointer, but the explicit cast will mask > not declaring malloc or including stdlib.h, and also mask assignment > to a non-pointer type; OK. > > -- avoid using types for sizes, in case someone later changes the > assigned pointer type; use object sizes instead; > > this is cleaner and more maintainable: > > a = malloc(rows * columns * sizeof *a); > This is not a good advice: you're changing the allocation of an object of (rows x columns) ints to another of (rows x columns) pointers to int.
webmaster | delorie software privacy |
Copyright © 2019 by DJ Delorie | Updated Jul 2019 |