Function boundp

Syntax:

Arguments and Values:

symbol—a symbol.

generalized-boolean—a generalized boolean.

Description:

7.1.1 18Returns 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:

I see no lexical environment here. --sjl 16 Mar 92 The \term{lexical environment} is ignored.The function boundp determines only whether a symbol has a value in the global environment; any lexical bindings are ignored.