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Expression-sum-field

Change-expression-sum-field

Modifying constructor for expression-sum-field structures.

Syntax

(change-expression-sum-field x 
                             [:type <type>] 
                             [:target <target>] 
                             [:alternative <alternative>] 
                             [:field <field>])

This is an often useful alternative to make-expression-sum-field.

We construct a new expression-sum-field 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-sum-field

(defmacro change-expression-sum-field (x &rest args)
  (std::change-aggregate
       'expression-sum-field
       x args
       '((:type . expression-sum-field->type)
         (:target . expression-sum-field->target)
         (:alternative . expression-sum-field->alternative)
         (:field . expression-sum-field->field))
       'change-expression-sum-field
       'nil))