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Expr-offsetof

Change-expr-offsetof

Modifying constructor for expr-offsetof structures.

Syntax

(change-expr-offsetof x 
                      [:type <type>] 
                      [:member <member>])

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

We construct a new expr-offsetof 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-offsetof

(defmacro change-expr-offsetof (x &rest args)
  (std::change-aggregate 'expr-offsetof
                         x args
                         '((:type . expr-offsetof->type)
                           (:member . expr-offsetof->member))
                         'change-expr-offsetof
                         'remake-expr-offsetof))