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Expression-if

Change-expression-if

Modifying constructor for expression-if structures.

Syntax

(change-expression-if x 
                      [:test <test>] 
                      [:then <then>] 
                      [:else <else>])

This is an often useful alternative to make-expression-if.

We construct a new expression-if 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-expression-if

(defmacro change-expression-if (x &rest args)
  (std::change-aggregate 'expression-if
                         x args
                         '((:test . expression-if->test)
                           (:then . expression-if->then)
                           (:else . expression-if->else))
                         'change-expression-if
                         'nil))