Re: [Boost-users] math.quaternion design issues

Subject: Re: [Boost-users] math.quaternion design issues
From: Sebastian Messerschmidt (sebastian.messerschmidt_at_[hidden])
Date: 2015-07-29 06:58:37

Hi.

Without knowing the internals I would simply guess the choice towards 
valarray stems from the fact, that element-wise mathematical operations 
are defined for it.

Cheers
Sebastian
> Hello,
>
> I am facing the following performance issues due to internals of quaternion.
>
> abs(q) function is quite slow, and most of the time (according to
> callgrind) is taken to create valarray which is easily unnecessarily
> here. valarray requires doing malloc and free, because it is dynamic
> container, at the same time the size of quaternion is 4 and it is fixed.
>
> So, was was the purpose to use std::valarray internally?
>
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