Comments for Joanna Carter

Comment on Design Patterns in Delphi by Buy Guaranteed Facebook Fans

Buy Guaranteed Facebook Fans — Tue, 29 Nov 2011 08:37:07 +0000

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Comment on The Observer Pattern by Buy Guaranteed Facebook Fans

Buy Guaranteed Facebook Fans — Sat, 26 Nov 2011 11:26:23 +0000

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Comment on The Iterator Pattern by giulio

giulio — Tue, 08 Aug 2006 17:49:29 +0000

Why don’t to add an implementation template using C# enerics? Anyway… very good!

Bye,

Giulio

Comment on The Observer Pattern by Mike S

Mike S — Tue, 28 Mar 2006 00:19:14 +0000

Nice article and thanks for putting it together.

Do you have a working example available for download? It is much easier to start with something that works and I have been completely unsuccessful in splicing

together the various snippets.

Comment on OO Frameworks Masterclass by wl

wl — Mon, 12 Sep 2005 20:36:26 +0000

no comment

Comment on The Iterator Pattern by Jose Luis

Jose Luis — Sat, 20 Aug 2005 15:55:57 +0000

If I add the "friendly" class to be able to declare the iterator class into another unit separated from TCustomerList class, I would need to add into the TCustomerIterator unit the uses of the TCustomerList.

Then, when I would like to add the GetIterator into the TCustomerList to create the iterator from withing the list ifself, am I going to have a circular reference?

Comment on The Iterator Pattern by Shawn Stamps

Shawn Stamps — Sun, 10 Jul 2005 19:05:11 +0000

Yes, it is an infinite loop. The correct code would be:

Repeat

Result := inherited Next;

Until Not Result Or Result And CurrentItem.CreditStop;

I’ve coded that kind of error so many times that I usually catch it right after I type it in.

Comment on The Observer Pattern by Joanna Carter

Joanna Carter — Thu, 09 Jun 2005 13:45:00 +0000

No, using interface references for delegation is just as valid as objects as long as you are aware of the refcounting and QueryInterface implications.

Comment on The Observer Pattern by Ilia Frenkel

Ilia Frenkel — Thu, 09 Jun 2005 13:34:16 +0000

Great article!

I have some remark, though:

TClockTimer = class(TInterfacedObject, IClockTimer, ISubject)

private

fTimer: TTimer;

fInternalTime: TDateTime;

fSubject: –>ISubject<–;

function GetTime: TDateTime;

procedure Tick(Sender: TObject);

property Subject: –>ISubject<–

read fSubject

implements ISubject;

public

constructor Create;

end;

Shouldn’t it be TSubject?

—

Best regards, Ilia Frenkel.

Comment on The Iterator Pattern by Stephen Melnyk

Stephen Melnyk — Tue, 23 Nov 2004 21:30:54 +0000

Thanks for the article, Joanna. I appreciate you taking the time to write it.

Could you clarify one point for me? In the Skip Iterators section, you implement TBadCustomerIterator.Next with:

repeat
Result := inherited Next;
until Result and CurrentItem.CreditStop

Isn't this an infinite loop? The last item in the list is going to return False from the inherited Next.

Stephen