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Expression-unary

Change-expression-unary

Modifying constructor for expression-unary structures.

Syntax

(change-expression-unary x 
                         [:operator <operator>] 
                         [:operand <operand>])

This is an often useful alternative to make-expression-unary.

We construct a new expression-unary 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-unary

(defmacro change-expression-unary (x &rest args)
  (std::change-aggregate 'expression-unary
                         x args
                         '((:operator . expression-unary->operator)
                           (:operand . expression-unary->operand))
                         'change-expression-unary
                         'nil))