boundp (Function)

Syntax:

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.