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Expr-value

Change-expr-value

Modifying constructor for expr-value structures.

Syntax

(change-expr-value x 
                   [:value <value>] 
                   [:object <object>])

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

We construct a new expr-value 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-value

(defmacro change-expr-value (x &rest args)
  (std::change-aggregate 'expr-value
                         x args
                         '((:value . expr-value->value)
                           (:object . expr-value->object))
                         'change-expr-value
                         'nil))