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Rule

Change-rule

Modifying constructor for rule structures.

Syntax

(change-rule x 
             [:name <name>] 
             [:incremental <incremental>] 
             [:definiens <definiens>])

This is an often useful alternative to make-rule.

We construct a new rule structure that is a copy of x, except that you can explicitly change some particular fields. Any fields you don't mention just keep their values from x.

Definition

This is an ordinary change- macro introduced by fty::defprod.

Macro: change-rule

(defmacro change-rule (x &rest args)
  (std::change-aggregate 'rule
                         x args
                         '((:name . rule->name)
                           (:incremental . rule->incremental)
                           (:definiens . rule->definiens))
                         'change-rule
                         'nil))