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Expr-cond

Change-expr-cond

Modifying constructor for expr-cond structures.

Syntax

(change-expr-cond x 
                  [:test <test>] 
                  [:then <then>] 
                  [:else <else>])

This is an often useful alternative to make-expr-cond.

We construct a new expr-cond 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-expr-cond

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