Re: smalleset() ( Re: [eigen] Householder.h: ::min() and operator<=)

[Christoph Hertzberg <chtz@xxxxxxxxxxxxxxxxxxxxxxxx>]

On 2016-09-12 17:05, Gael Guennebaud wrote:
> Perhaps, another solution would be to always write Literal(0),  Literal(1)
> instead of Scalar(x). By default, NumTraits<T>:: Literal is defined as T,
> and as NumTraits<Scalar>::Real for std::complex.
>
> This is not much more typing (one more typedef here and there), and this is
> more efficient as this preserve the fact that the number is real.
>
> This assumes that the following is fine for any T:
>
> T r;
> std::complex<T> c = r;

I guess this works as long as the default constructor of T exists and 
creates a zero element (which generally is a reasonable requirement).


Christoph


> gael

--
 Dipl. Inf., Dipl. Math. Christoph Hertzberg

 Universität Bremen
 FB 3 - Mathematik und Informatik
 AG Robotik
 Robert-Hooke-Straße 1
 28359 Bremen, Germany

 Zentrale: +49 421 178 45-6611

 Besuchsadresse der Nebengeschäftsstelle:
 Robert-Hooke-Straße 5
 28359 Bremen, Germany

 Tel.:    +49 421 178 45-4021
 Empfang: +49 421 178 45-6600
 Fax:     +49 421 178 45-4150
 E-Mail:  chtz@xxxxxxxxxxxxxxxxxxxxxxxx

 Weitere Informationen: http://www.informatik.uni-bremen.de/robotik