CLHS: Function BOUNDP

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Function BOUNDP

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

Affected By: None.

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.

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