[yunqa.de] Re: How to iterate TDIUnicodeStringHash?
- From: Delphi Inspiration <delphi@xxxxxxxx>
- To: yunqa@xxxxxxxxxxxxx
- Date: Wed, 01 Oct 2014 17:29:28 +0200
On 01.10.2014 15:21, Rael Bauer wrote:
My main purpose is for lookup hence I chose a hash list, however on some
occasions i need to iterate the entire list.
If fast lookup is your main requirement use a hash list.
I notice you use VectorCount:
for i := 0 to UnicodeStringHash.VectorCount - 1 do
1) Why not use UnicodeStringHash.Count?
TDIHash vectors store their Items in a separate hash vector. The
TDIHash.VectorCount returns the number of slots in that vector. However,
not all slots are always filled in, hence the check for TDIHash.IsDeleted().
2) If I do use UnicodeStringHash.Count, then do I still need to check
for deleted items?
If you use TDIHash.Count you will miss some items. Do not use it. This
rule should explain why:
TDIHash.Count <= TDIHash.VectorCount
Ralf
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