Re: Distinguish primitive and defined functions inside an operator of APL2

Thmas,

I believe there is no way to accurately determine what function or which
primitive was used as an operand to a defined operator.

Furthermore, I also believe you can not code support for prototypes in
defined operators to effect their results when used with each, because each
does not actually call its operand for when an argument is empty.  It
generates the result using the prototype of the argument without calling the
operand.

David Liebtag
IBM APL Products and Services

Mike,

I don't believe primitives are called either.  Instead, a fill function is
used.  You can read about fill functions in the APL2 Programming: Language
Reference Manual, Chapter 4. General Information.

However, there is a deviation concerning each and fill functions in the
workstation interpreter.  This is documented in the User's Guide, Deviations
Appendix, General Language Differences, Restrictions section.


David Liebtag