[Cuis-dev] What/Where is Infinity and NegativeInfinity?

[Juan Vuletich]

Hi Nafiz,

On 6/23/2024 12:33 PM, Nafiz Islam via Cuis-dev wrote:
> What/Where is Infinity and NegativeInfinity?

They are class variables in class Float.

> I see Infinity and NegativeInfinity being referenced in BoxedFloat64.
>
> 'From Cuis7.1 [latest update: #6472] on 23 June 2024 at 11:31:09 am'!
>
> !BoxedFloat64 methodsFor: 'testing' stamp: 'jmv 8/1/2019 16:42:00'!
> isInfinite
>     "Return true if the receiver is positive or negative infinity."
>
>     ^ self = Infinity or: [self = NegativeInfinity]! !
>
> But when I try to "Do it" in the Workspace, it returns unknown variable.

Class variables are not global, and are not directly accessible in a 
Workspace. They are available inside the Float hierarchy. So, if you 
evaluate them inside the #isInfinite mehod, there they are. More 
interesting, click on the [class vars]  button and select any of them. 
You'll get a browser showing all methods using them. In particular, 
there are two methods that answer them. This is the way to access them 
from a Workspace, from from any other class in the system.

Cheers,

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-- 
Juan Vuletich
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