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Driver

Change-driver

Modifying constructor for driver structures.

Syntax

(change-driver x 
               [:value <value>] 
               [:strength <strength>])

This is an often useful alternative to make-driver.

We construct a new driver 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 defprod.

Macro: change-driver

(defmacro change-driver (x &rest args)
  (std::change-aggregate 'driver
                         x args
                         '((:value . driver->value)
                           (:strength . driver->strength))
                         'change-driver
                         'remake-driver))