boundp

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.

Expanded Reference: boundp

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