Function Entry: VL-ACAD-UNDEFUN

← Prev | ↑ Chapter | Next → | Index | Symbols

Function Entry: VL-ACAD-UNDEFUN

Name

vl-acad-undefun

Class

Visual LISP external-exposure function

Syntax

(vl-acad-undefun 'symbol)

Arguments and Values

  • symbol — subroutine or symbol naming a function.

Description

Undefines an AutoLISP function symbol so it is no longer available to ObjectARX applications.

Return Values

Returns an integer if successful; returns nil if unsuccessful.

Side Effects

Removes external visibility of the designated function.

Notes

  • Autodesk documents use on c: functions and functions previously exposed with vl-acad-defun.

Availability

  • AutoCAD 2026: documented (per Autodesk reference page).
  • BricsCAD V26: presumed compatible (no contradicting page found).
  • Status: AutoCAD documented; BricsCAD presumed-both pending Phase 4 verification.