From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-0.9 required=5.0 tests=BAYES_00,FORGED_GMAIL_RCVD, FREEMAIL_FROM autolearn=no autolearn_force=no version=3.4.4 X-Google-Thread: 103376,ec2a500cce3658c4 X-Google-Attributes: gid103376,public X-Google-Language: ENGLISH,ASCII-7-bit Path: g2news1.google.com!postnews1.google.com!not-for-mail From: mosteo@gmail.com (Alex R. Mosteo) Newsgroups: comp.lang.ada Subject: Re: Memory leak - What the ...? Date: 12 Oct 2004 07:47:33 -0700 Organization: http://groups.google.com Message-ID: References: NNTP-Posting-Host: 62.101.167.106 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Trace: posting.google.com 1097592454 24950 127.0.0.1 (12 Oct 2004 14:47:34 GMT) X-Complaints-To: groups-abuse@google.com NNTP-Posting-Date: Tue, 12 Oct 2004 14:47:34 +0000 (UTC) Xref: g2news1.google.com comp.lang.ada:5096 Date: 2004-10-12T07:47:33-07:00 List-Id: Marius Amado Alves wrote in message news:... > I still lack an understandable explanation of why this does not leak: > > if This.Data /= null then > This.Data := new Stream_Element_Array'(This.Data.all); > end if; Adjust is called just after the members of the record have been copied. So imagine you have A := B; When Adjust(A) gets called, you will have A.Data = B.Data Since Data is an access type, you have a shallow copy where both A and B have members pointing to the same heap space. In the Adjust, what A does is replicate the pointed data to get a new pointer and a deep copy where A and B point to different heap copies. Additionally, before A being overwritten, Finalize(A) is called just in case it needs to free some memory. Hope this helps.