Newsgroups: comp.lang.c
Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!uupsi!rlgvax!scc
From: scc@rlgvax.Reston.ICL.COM (Stephen Carlson)
Subject: Re: Deleting linked lists.
Reply-To: scc@rlgvax.OPCR.ICL.COM (Stephen Carlson)
Organization: International Computers Limited
Distribution: na
Date: Tue, 2 Apr 91 22:42:07 GMT
Message-ID: <1991Apr2.224207.12083@rlgvax.Reston.ICL.COM>
Keywords: C,  C++.
References: <2636@borg.cs.unc.edu> <846@saxony.pa.reuter.COM>

In article <846@saxony.pa.reuter.COM> dgil@pa.reuter.COM (Dave Gillett) writes:
>In <2636@borg.cs.unc.edu> warner@weiss.cs.unc.edu (Byron Warner) writes:
>>	free(ptr);
>    Even if the value of ptr is not changed by free(), you have absolutely no

Since C is call-by-value, free() cannot change the value of ptr.  However,
free() may release space back to operating system so that a subsequent
inspection of ptr will trap.

-- 
Stephen Carlson           | ICL OFFICEPOWER Center    | In theory, theory and
scc@rlgvax.reston.icl.com | 11490 Commerce Park Drive | practice are the same.
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