[fpc-pascal] Re: State of fcl-stl generics lib

[Michael Van Canneyt]

On Sun, 20 Jan 2013, Florian Klämpfl wrote:

> Am 20.01.2013 15:16, schrieb Michael Van Canneyt:
>>
>>
>> On Sun, 20 Jan 2013, Florian Klämpfl wrote:
>>
>>> Am 20.01.2013 14:47, schrieb Michael Van Canneyt:
>>>>>>
>>>>>> ? Why not ? I see no difference with a list or collection ?
>>>>>
>>>>> A tree is something implementation specific while the fpc-stl is only
>>>>> about opaque data structures. E.g. the fpc-stl supports TSet: but the
>>>>> whole implementation is hidden. The user does not/need not to know how
>>>>> the set works internally. It could be a linked list, a tree, whatever.
>>>>
>>>> For me, a tree is a data structure, just like a set, list, collection,
>>>> queue, whatever.
>>>
>>> A tree is an implementation detail. For example a set could be
>>> implemented using a tree.
>>
>> I understand you the first time :-)
>>
>> For me, a tree is at the same level as a set. Whatever models your data
>> best.
>
> A set is defined by some properties and possible operations like that it
> can contain each element only once, that it is possible to build
> intersections, unions etc.

Aha... That's a mathematical definition.

So: A graph is also mathematically defined. And a tree is just a specialized graph.

Stalemate :-)

Michael.