Dear Gregor,
Just a quick question: did you re-implement eval() method for
your class?
Best wishes,
Vladimir
--
Vladimir V. Kisil http://www.maths.leeds.ac.uk/~kisilv/
Book: Geometry of Mobius Maps https://doi.org/10.1142/p835
Soft: Geometry of cycles http://moebinv.sourceforge.net/
Jupyter notebooks: https://github.com/vvkisil/MoebInv-notebooks
>>>>> On Wed, 10 Nov 2021 09:47:17 +0100, Gregor Kälin <kaelingre at gmail.com> said:
GK> Hi,
GK> I'm extending GiNaC by some new classes and ran into a problem
GK> with subs and eval. My class, representing an integral, inherits
GK> from basic and is essentially a container class containing
GK> several ex's itself. The subs method, inherited from basic,
GK> works as expected for the substitution step, but does not
GK> re-evaluate the expression (i.e. the eval function of my class
GK> is not called after the substitution happened). The tutorial
GK> states "All GiNaC methods that transform expressions, like
GK> subs() or normal(), automatically re-evaluate their results."
GK> and, hence, I would expect that the default subs method of the
GK> basic class calls eval somewhere in the process. Is this a bug
GK> in basic::subs or am I supposed to take care of a re-evaluation
GK> of my custom classes myself (i.e. essentially overriding subs
GK> and calling eval explicitly in the process)? Looking into the
GK> source code (I'm on commit 9197695fc, ginac version 1.8.1-1) I'd
GK> expect a call to eval on line 628 of basic.cpp after all
GK> operands have been substituted, and before subs_one_level is
GK> called.
GK> Best,
GK> Gregor
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