Re: [boost] boost interval arithmetic

Subject: Re: [boost] boost interval arithmetic
From: Marc Glisse (marc.glisse_at_[hidden])
Date: 2015-01-15 12:14:07

On Thu, 15 Jan 2015, Asbjørn wrote:

> On 15.01.2015 15:01, Павел Кудан wrote:
>> Now see:
>>
>> [-1.0, 1.0] / .0
>>
>> What is the correct result? Of course, [-inf, inf]
>
> The way I understand interval arithmetics, the result is the set
> {x / 0 for all x in [-1, 1]}.
>
> Now, x/0 is undefined for all x in [-1, 1], so returning an empty set seems 
> logical to me.

For IEEE double, 1./0 is well defined as +inf, and -1./0 as -inf, so I 
agree that returning an empty set (apparently creating an empty set 
throws, with the default policy) is questionable, it depends on your 
application whether you want empty or [-inf,+inf]. I did not check if 
boost provides a policy to change that behavior.

-- 
Marc Glisse