[bug] Float >> NaN in a dictionary

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 Project:      GNU Smalltalk
 Version:      <none>
 Component:    Base classes
 Category:     bug reports
 Priority:     normal
 Assigned to:  Unassigned
 Reported by:  MrGwen
 Updated by:   MrGwen
 Status:       active

Hi,

I cann add a Float >> NaN in a dictionary by the way multiple times (

st> p at: (FloatQ allInstances at: 3) put: 123
st> p at: (FloatQ allInstances at: 3) put: 123
st> p at: (FloatQ allInstances at: 3) put: 123
st> p
Dictionary (
       NaN->123
       NaN->123
       NaN->123
))

But when I try to acces to it, it failed :

Object: Dictionary new: 32 "<0x2b1783097a40>" error: Invalid argument
Inf: key not found
SystemExceptions.NotFound(Exception)>>signal
SystemExceptions.NotFound(Exception)>>signal:
SystemExceptions.NotFound class>>signalOn:what:
[] in Dictionary>>at:
Dictionary>>at:ifAbsent:
Dictionary>>at:
UndefinedObject>>executeStatements




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Issue status update for
http://smalltalk.gnu.org/project/issue/317
Post a follow up:
http://smalltalk.gnu.org/project/comments/add/317

 Project:      GNU Smalltalk
 Version:      <none>
 Component:    Base classes
 Category:     bug reports
 Priority:     normal
 Assigned to:  Unassigned
 Reported by:  MrGwen
 Updated by:   bonzinip
 Status:       active

I'd say it does not make much sense.  Given that NaNs are ~= to
themselves, you cannot do anything with them in an equality-based hash
table (only in a identity-based one).

Were you just playing with fire or did you get into this in some
real-world case?

I wonder how much if anything would be broken by making Float>>#hash
raise an exception for NaNs.




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On Friday 12 June 2009 11:09:54 Paolo Bonzini wrote:
I understand, I don't know well the behavior of Float.

>
> Were you just playing with fire or did you get into this in some
> real-world case?
>

In fact I'm working on a tool for saving "image" written in Smalltalk. (I need
to create this tool and not to use the code in the vm) So the idea is to put
all the objects in a dictionary and we know if the object was written or not
(and by the way the position of the written object is in the dic) - like the
SystemTracer in Squeak. But I can handle this problem in an other way.

Cheers,
Gwenael

--

GtkLauncher for GNU Smalltalk : http://gtklauncher.bioskop.fr/


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> In fact I'm working on a tool for saving "image" written in Smalltalk. (I need
> to create this tool and not to use the code in the vm) So the idea is to put
> all the objects in a dictionary and we know if the object was written or not
> (and by the way the position of the written object is in the dic) - like the
> SystemTracer in Squeak. But I can handle this problem in an other way.

You need an IdentityDictionary for that anyway.

Paolo


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Issue status update for
http://smalltalk.gnu.org/project/issue/317
Post a follow up:
http://smalltalk.gnu.org/project/comments/add/317

 Project:      GNU Smalltalk
 Version:      <none>
 Component:    Base classes
 Category:     bug reports
 Priority:     normal
 Assigned to:  Unassigned
 Reported by:  MrGwen
 Updated by:   bonzinip
-Status:       active
+Status:       fixed

Fixed in 46d1034 by refusing to hash a NaN (it works in
IdentityDictionaries of course).




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