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Value-pointer

Change-value-pointer

Modifying constructor for value-pointer structures.

Syntax

(change-value-pointer x 
                      [:core <core>] 
                      [:reftype <reftype>])

This is an often useful alternative to make-value-pointer.

We construct a new value-pointer 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-value-pointer

(defmacro change-value-pointer (x &rest args)
  (std::change-aggregate 'value-pointer
                         x args
                         '((:core . value-pointer->core)
                           (:reftype . value-pointer->reftype))
                         'change-value-pointer
                         'nil))