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  ANSI Common Lisp   10 Symbols   10.2 Dictionary of Symbols

10.2.17 boundp Function

boundp symbol    generalized-boolean

Arguments and Values:
symbol - a symbol.

generalized-boolean - a generalized boolean.

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

 (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

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

Allegro CL Implementation Details:

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