Function Entry: VL-ACAD-DEFUN

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Function Entry: VL-ACAD-DEFUN

Name

vl-acad-defun

Class

Visual LISP external-exposure function

Syntax

(vl-acad-defun 'symbol)

Arguments and Values

  • symbol — symbol naming a function.

Description

Defines an AutoLISP function symbol as an external subroutine callable from ObjectARX.

Return Values

Returns an integer success value.

Side Effects

Exposes the designated function to external ObjectARX callers.

Notes

  • Autodesk documents this as useful for non-c: functions that should be callable from external ObjectARX applications.
  • This is part of the host integration boundary rather than portable core language semantics.

Availability

  • AutoCAD 2026: documented (per Autodesk reference page).
  • AutoCAD 2022: verified present as a SUBR by runtime probe 2026-08-09.
  • BricsCAD V25 and V26: verified present as a SUBR by runtime probe 2026-08-09. The Bricsys DevRef "VLX NameSpace Support" page documents the family as supported since V18.2 (DEScoder v2.7+).
  • Status: verified on both vendors (no longer "presumed compatible"); see chapter 22 § VLX namespace family: verification 2026-08-09.