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Expression-sub

Change-expression-sub

Modifying constructor for expression-sub structures.

Syntax

(change-expression-sub x 
                       [:arg1 <arg1>] 
                       [:arg2 <arg2>])

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

We construct a new expression-sub 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-sub

(defmacro change-expression-sub (x &rest args)
  (std::change-aggregate 'expression-sub
                         x args
                         '((:arg1 . expression-sub->arg1)
                           (:arg2 . expression-sub->arg2))
                         'change-expression-sub
                         'nil))