boundp [Function]

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::

section set [Function] , section setq [Special Form] , section symbol-value [Accessor] , section makunbound [Function]

Notes::

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

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