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Fenv

Change-fenv

Modifying constructor for fenv structures.

Syntax

(change-fenv x 
             [:constants <constants>] 
             [:curve <curve>])

This is an often useful alternative to make-fenv.

We construct a new fenv 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-fenv

(defmacro change-fenv (x &rest args)
  (std::change-aggregate 'fenv
                         x args
                         '((:constants . fenv->constants)
                           (:curve . fenv->curve))
                         'change-fenv
                         'nil))