[Newbies] Float-Subclasses?

[bb]

Am 29.06.2011 17:03, schrieb Bert Freudenberg:
> On 29.06.2011, at 16:29, bb wrote:
>
>> Am 29.06.2011 15:56, schrieb Bert Freudenberg:
>>> On 29.06.2011, at 15:34, bb wrote:
>>>
>>>> I found that there are some Float-Subclasses: 
>>>> FloatD
>>>> FloatE
>>>> FloatQ
>>>> How can I use them and what are they good for? 
>>>> I do not understand the use of
>>>> LargeZeroInteger
>>>> as well.
>>> These classes are not in any official Squeak image. What image are you using? Which packages are they in?
>>>
>>> - Bert -
>>>
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>>> Beginners at lists.squeakfoundation.org
>>> http://lists.squeakfoundation.org/mailman/listinfo/beginners
>> I am badly curious - so I sometimes cross check with other Smalltalk80
>> versions. I hope that is not a betrayal.
> Well, if you are not actually using Squeak then it would at least help to state which Smalltalk you are referring too. 
>
>> I found that classes in a GNU Smalltalk-80  documentation
>> http://www.gnu.org/software/smalltalk//manual-base/html_node/FloatD.html. I
>> was not aware that this was a GNU Smalltalk docu.
>>
>> But that classes do have some interesting methods.
> FWIW, Squeak has only one Float class (IEEE double-precision, 64 bits). In addition, there is FloatArray, storing Floats as 32 bit single-precision values.
>
> - Bert -
>
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> Beginners mailing list
> Beginners at lists.squeakfoundation.org
> http://lists.squeakfoundation.org/mailman/listinfo/beginners
Well, I found in the selector browser no FloatD/E/Q, but I found
corresponding methods asFloatD/E/Q.
Just for completeness of Information about that classes in question, I
found a description of the methods:

onionmixer.net/extra_data/gst.pdf

6.104.4 Number: converting
asFloat This method's functionality should be implemented by subclasses
of Number
asFloatD This is mandated by the ANSI standard; since *GNU Smalltalk
currently does
        not support different floating-point classes*, simply convert
the receiver to a
           Float.
asFloatE This is mandated by the ANSI standard; since *GNU Smalltalk
currently does
        not support different floating-point classes*, simply convert
the receiver to a
           Float.
asFloatQ This is mandated by the ANSI standard; since *GNU Smalltalk
currently does
        not support different floating-point classes*, simply convert
the receiver to a
           Float.
...

I bolded parts of the text.

As I found out in the squeak sources, taht it uses this methods
asFloatD/E/Q for the same reason!

Regards

B. Blochl
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