[Gambas-user] An other problem with object oriented approach.

[Fabien Bodard]

yes you soluce is collection



2008/12/13 Werner <wdahn at ...1000...>:
> Jussi Lahtinen wrote:
>> Hi!
>>
>> I'm converting Vb6 project to Gambas.
>> And because Gambas doesn't have UDT/structures, I have to rethink some
>> of the code (not necessary bad thing).
>> I'm converting some parts of the code to object oriented way.
>> But I run into some problems with it.
>> I have module which contains mainly global arrays and global UDT arrays.
>> That module describe items, every item is identified by index number.
>> Like this (vb6 code):
>> Global Alive(Max_Number_Of_Items)  as boolean
>>
>> So if I want to know if item 2 is alive, I'll write:
>> IF Alive[2] = TRUE THEN
>>
>> Problem is in identification, items have to know who is who.
>> Old array based code is something like this:
>>
>> IF Alive[Who] = TRUE THEN
>> ComWith = CommunicateWith[Who]
>>   IF Alive[ComWith] = TRUE THEN
>>   WhereX[ComWith] = ...
>>   WhereY[ComWith] = ...
>>     ...
>>
>> And when I want to save/load items to/from file, I use Id <--> Index
>> translation function which translates CommunicateWith array with ID
>> array.
>> But that is way too slow to use at normal execution, it is useful only
>> on file operations.
>> If I convert these items to objects, there is not much point to use
>> Alive array (etc.), I'll just remove dead items and add new one only
>> when needed. But that creates problem with identification, since I
>> can't use index numbers anymore!
>> And looping every item to see if it have right Id number (that matches
>> to CommunicateWith[WhoEverAsk]) is way too slow (like in
>> Id <--> Index translation function).
>> Slow because there are many(!) items, and every item should be checked
>> against every item!
>>
>> So, any ideas how to implement fast identification between objects?
>> Other words, how to translate Id to Index without looping?
>>
>> I'm trying to learn object oriented style and right now it's very
>> difficult to stretch my brains around it...
>>
>>
>> Jussi
>>
> If there is anything unique in your items you could use a collection
> instead of an array and use the unique part as a key.
> Werner
>
>
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