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Expression-when

Change-expression-when

Modifying constructor for expression-when structures.

Syntax

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

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

We construct a new expression-when 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-when

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