CHR # operator

[Anne Ogborn]

Can anybody explain the # operator in CHR in SWI-Prolog?

[Falco Nogatz]

Hi Anne,

where have you stumbled over the # operator in CHR?

Best,

Falco

[Anne Ogborn]

In the sources, it's defined as an operator.


On this page

http://www.swi-prolog.org/pldoc/man?section=SyntaxAndSemantics

apparently they're somehow associated with rule id's. And it's unclear
what the rule id's do at all

See also the passive pragma, which refers to it.


::Annie is here, playing nicely. She's reading the CHR sources to her dolly..::

[Alan Baljeu]

Rule IDs do absolutely nothing in the SWI implementation.  I think the only use I've had for # is the passive operator, which is a little like a ! cut in SWI.  If used correctly it makes the program more efficient.  If used wrongly, it makes the program misbehave.

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