On Wed, Feb 11, 2015 at 9:17 AM, Marc Mezzarobba <m...@mezzarobba.net> wrote: > Jeroen Demeyer wrote: > >> You are missing something: > > Indeed! Thanks for pointing it out. That was sloppy grepping of mine. > >> * finite fields are Python >> (src/sage/rings/finite_rings/finite_field_*.py) > > So in this case, apparently, > > (i) the Python parent classes derive from an abstract Cython class > (in addition to Parent, Ring, etc.); > > (ii) beside their pointers to the parents, some elements store pointers > to a separate Cyton data structure that contains the information > that arithmetic operations need to access (same idea as the > "shadow parent" of my first message). > > Would that be the/a recommended way to get fast arithmetic on small > objects?
Yes, this is perfectly fine. Actually implementing the Parent in Cython works too, but then one runs into the issue of circular imports at the C level... > Sorry if my questions are not clearly motivated by a concrete example. > I am trying to get an idea of what is current best practice and what is > there for historical reasons among what I see in the sage library. And these are very good questions. > If > this helps, an example to which I think some of this applies is the > beginning implementation of a RealBallField based on arb (#17194), which > I am trying to review. But that's not the only or even the primary > motivation of my questions. > > Thanks again, > > -- > Marc > > -- > You received this message because you are subscribed to the Google Groups > "sage-devel" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sage-devel+unsubscr...@googlegroups.com. > To post to this group, send email to sage-devel@googlegroups.com. > Visit this group at http://groups.google.com/group/sage-devel. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at http://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
