boundp

ToC

Allegro CL

ANSI Common Lisp

10 Symbols

10.2 Dictionary of Symbols

10.2.17 boundp

Function

Syntax:

boundp symbol

generalized-boolean

Arguments and Values:

symbol - a symbol.

generalized-boolean - a generalized boolean.

Description:

Returns true if symbol is bound; otherwise, returns false.

Examples:

 (setq x 1)  1
 (boundp 'x)  true
 (makunbound 'x)   X
 (boundp 'x)  false
 (let ((x 2)) (boundp 'x))  false
 (let ((x 2)) (declare (special x)) (boundp 'x))  true

Exceptional Situations:

Should signal an error of type type-error if symbol is not a symbol.

See Also:

set, setq, symbol-value, makunbound

Notes:

The function bound determines only whether a symbol has a value in the global environment; any lexical bindings are ignored.

Allegro CL Implementation Details:

None.