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Branch

Change-branch

Modifying constructor for branch structures.

Syntax

(change-branch x 
               [:test <test>] 
               [:body <body>])

This is an often useful alternative to make-branch.

We construct a new branch 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-branch

(defmacro change-branch (x &rest args)
  (std::change-aggregate 'branch
                         x args
                         '((:test . branch->test)
                           (:body . branch->body))
                         'change-branch
                         'nil))