[fpc-pascal]TCollection question

[James Mills]

On Sun, Jul 06, 2003 at 05:11:17PM +0200, Marco van de Voort wrote:
> > > IIRC, TCollection only stores TCollectionItem derived classes.
> > > 
> > > TList is closer to what you want probably.
> > 
> > Is there an example other than list.pp in the fcl source ?
> > 
> > Also just for the record of knowing... I have attached datanicks.pas
> > which hold a dynamic array of TNick ... Is this what TList already does
> > (if so I'm wasting my time writing my own code...) ?
> 
> Pretty much yes, but in a class wrapper. You can add and remove items,
> iterate through them etc.  Maybe you can derive a class from TList to
> customize it a bit.

However TList by itself would work though ?

> 
> There are two things to think of:
> - you yourself have to make sure that elements are properly freed, so
>    when deleting object A, get a reference to it, delete it from the list, 
>    and then free the object. (however that can be automized in the class
>    warpper)
Is this all done and automated in TList ?

> - The internal list has two counters, instead of just "nNicks". One
>    (capacity) is the reserved space, the other (count) is the amount of
>    elements filled. This avoids too many memory fragmenting reallocs.
>     (but that's better, not worse)
> 
> I learned to use the classes from code snippets written for  Delphi.
> 
> There is FCL documentation somewhere (and it will be in the next full 
> release), but I couldn't find a recent version so fast.
> 
> So I put down a very old version (April 2002) on the web here:
> 
> www.stack.nl/~marcov/fcl.pdf

I think it's here also in html format:
http://www.nl.freepascal.org/docs-html/fcl/classes/tlist.html

cheers
James

> 
> it at least describes the tlist methods.
> 
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-- 
-
- James Mills
Zero Defect Software Engineers Group - ZDSEG