Re: [boost] Floating Point Utilities Review starts today

From: Johan Råde (rade_at_[hidden])
Date: 2008-02-25 13:49:15

Guillaume Melquiond wrote:
> Le lundi 25 février 2008 à 18:25 +0100, Johan Råde a écrit :
> 

>>> What is the rationale for not enabling signed_zero by default?
>> I think most users of the library will not want it enabled by default.
>> They may not care much about the fine details of floating point arithmetic.
>> Insted they may just want to prevent crashes when deserializing text archives
>> that contain (by design or by accident) infinity or NaN.
> 
> I should have added the following: On all the systems I have access to
> (various *nix flavors), the default behavior is to display the sign of
> negative zero. So I don't know if that is what the users expect. But I'm
> quite sure that users don't expect a change in the way zero is
> displayed, when they use a facet dedicated to "nonfinite" things.

On VC71, the default behavior is not to display the sign of negative zero.
I'll have to think about this.

--Johan