[fpc-pascal] about dynamic array

spir ☣ denis.spir at gmail.com
Thu May 6 13:07:25 CEST 2010

On Thu, 6 May 2010 12:16:22 +0200
Graeme Geldenhuys <graemeg.lists at gmail.com> wrote:

> 2010/5/6 spir ☣ <denis.spir at gmail.com>:
> >
> > If the answers to last 2 questions is "only every 29th of februar", how can one have a "flexible" array? Is there something like that in stock? Would you implement it on top of dynamic array, or rather from scratch on top of static array (since the "dynamicity" does not seem very helpful)?
> >
> Use a list class instead. Descend from TList or embed TList in a class
> as a field variable. I hardly ever use arrays, simply because list
> classes can do everything you mention and works as expected.

Right, Michael gives the same advice. What I need is actually a general-purpose sequence type. The point is that insertion/deletion is indeed required, but the most common operations are the ones efficient with arrays, esp. plain item access via index. This is the reason why sequences in dynamic languages (eg python lists) are in fact implemented as flexible arrays, that simply happen to also behave like lists from the point of view of client code.
So, if TList is a type of linked list, it can probably not do the job for me. Anyway, I'm not a production programmer & would be pleased to explore this topic as an occasion to learn Pascal and fp further.
Tips/pointers welcome. (I'm currently stuck with how to have a [pointer] variable/field refer to a static array which size may change ;-)


vit esse estrany ☣


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