[Newbies] constants

[Mark Volkmann]

On Sep 29, 2008, at 6:00 AM, Marcin Tustin wrote:

> The initialize method on the class side will be called only when  
> *the class* is initialised. You are thinking of the instance-side  
> initialize method which is called each time you create an instance.

Wow. I wasn't aware that there was both a class and instance  
initialize method. Thanks for explaining that!

What causes the class initialize method to be invoked ... and  
reinvoked after I change it?

> On 9/29/08, Mark Volkmann <mark at ociweb.com> wrote:
> On Sep 28, 2008, at 11:32 PM, K. K. Subramaniam wrote:
>
> On Sunday 28 Sep 2008 7:26:43 pm Mark Volkmann wrote:
> I think my main issue is scoping. I want to define a constant that is
> associated with a class to avoid name conflicts.
> See classes Color, Cursor or Float for examples of scoped constants:
>  Color red
>  Cursor wait
>  Float pi
>
> For constants that should be exposed to a few (but not all) classes,  
> use pool
> dictionaries.
>
> Thanks! This brings up another question. Where is a good place to  
> initialize a constant? I see in the case of "Float pi" that it is  
> held in a class variable that is initialized in the initialize  
> method. Isn't it the case that the initialize method is only called  
> if a Float object is created? Also, isn't it called every time a  
> Float object is created? It seems that would mean if I followed that  
> pattern for one of my own constants then I wouldn't be sure it was  
> set and I'd pay the cost of setting it many times.
>
> ---
> Mark Volkmann
>
>
>
>
>
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---
Mark Volkmann




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