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• Position

Change-position

Modifying constructor for position structures.

Syntax

(change-position x 
                 [:line <line>] 
                 [:column <column>]) 

This is an often useful alternative to make-position.

We construct a new position 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-position

(defmacro change-position (x &rest args)
  (std::change-aggregate 'position
                         x args
                         '((:line . position->line)
                           (:column . position->column))
                         'change-position
                         'nil))