Experimental Physics and Industrial Control System
Benjamin Franksen wrote:
It would be very useful if in CALC expressions (e.g. in calc and calcOut
record) one could call MIN and MAX with an arbitrary (two or more) number of
arguments, instead of only exactly two as it is to date.
I agree that it would, and someone (I forget who) created a version that
could do that, but that implementation involved pushing a marker
(probably a NaN) onto the value stack to indicate the start of the
argument list. This approach is no longer feasible since the calc
engine now properly handles NaN and Inf values, so they can't be used as
markers like that.
Supporting variable length argument lists could mean some fairly
significant rework on the current base/src/libCom/calc/postfix.c parser,
although it may not be as hard as I think for someone with a good
understanding of compilers and parsers. We do have a fairly good test
suite for the CALC engine in the libCom/test area now, so this is a
fairly self-contained work package for anyone who wants to look at it
(email me first though).
Thanks Ben, I've added this to the list.
- Andrew
--
When a distinguished but elderly scientist states that something is
possible, he is almost certainly right. When he states that something
is impossible, he is very probably wrong. -- Arthur C. Clarke
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