Re: tList.destroy

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#511

From: ullrich
Date: Sat, 09 May 1998 00:00

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In article <pacsoftEsnnEB.2nE@netcom.com>,
  pacsoft@netcom.com (Wilhelm Sarasalo) wrote:
>
> A long time ago I looked at the source for tList.Destroy and it didn't
> seem right because it overrode tObject.Destroy, but didn't call it, it
> just called clear that sets count and capacity to 0.
>
> Now I bought a debugging tool called BoundsChecker from NuMega. It
> reported resource leakage where I had tList.create/tList.free pairs.
>
> I modified classes.pas adding inherited destroy to tList.destroy,
> BoundsChecker quit reporting any leakage. Programs didn't change their
> behavior.

    TList descends directly from TObject. TObject's Destroy method
doesn't do anything, so the program behaves the same whether
inherited Destroy is called or not. (The 32 bytes(?) allocated
for _any_ object gets freed by _any_ destructor, and there's
nothing else for TObject.Destroy to do.)

      Evidently BoundsChecker doesn't understand this.

David C. Ullrich



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From: ullrich@math.okstate.edu
Subject: Re: tList.destroy
Date: 1998/05/09
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