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Expr-extension

Change-expr-extension

Modifying constructor for expr-extension structures.

Syntax

(change-expr-extension x 
                       [:expr <expr>])

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

We construct a new expr-extension 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-extension

(defmacro change-expr-extension (x &rest args)
  (std::change-aggregate 'expr-extension
                         x args '((:expr . expr-extension->expr))
                         'change-expr-extension
                         'remake-expr-extension))