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Double-value

Change-double-value

Modifying constructor for double-value structures.

Syntax

(change-double-value x 
                     [:double <double>])

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

We construct a new double-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-double-value

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