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Hi Amir

If you only need square roots, you can use CGAL::Root_of_2<RT> or 
alternatively the new CGAL::Sqrt_extension<NT,ROOT>

They are robust and quite efficient compared to the more powerful Core 
expressions.

Best,
        Monique Teillaud


 wrote:
> I am implementing an event-based algorithm, which has to be very robust in order to wprk properly. Unfortunately, I can't use rational numbers, and so I tried to apply CORE::expr types (I need closure for the usual arithmetics and square root). 
>
> However, when I try to compare two CORE::expr numbers which are very close, 
> but that were calculated different, the comparison takes an unproportionate 
> amount of times (sometimes severel minutes), and smetimes it just gets 
> stuck.. am I doing something wrong? (or is there a more prefered number type?)
>
> Amir.