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Pointer-null

Change-pointer-null

Modifying constructor for pointer-null structures.

Syntax

(change-pointer-null x 
                     )

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

We construct a new pointer-null 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-pointer-null

(defmacro change-pointer-null (x &rest args)
  (std::change-aggregate 'pointer-null
                         x args 'nil
                         'change-pointer-null
                         'nil))