Function Entry: VL-SYMBOLP

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Function Entry: VL-SYMBOLP

Name

vl-symbolp

Class

Visual LISP Function

Syntax

(vl-symbolp obj)

Arguments and Values

  • obj: any value

Description

Tests whether obj is a symbol.

Return Values

  • T if obj is a symbol
  • nil otherwise

Autodesk explicitly documents that:

  • (vl-symbolp t) => T
  • (vl-symbolp nil) => nil

Side Effects

None.

Compatibility

This entry is particularly important because its treatment of nil is easy to get wrong if one projects Common Lisp assumptions into AutoLISP.

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.