symbol-package (Function)

Syntax:

Arguments and Values:

symbol—a symbol.

contents—a package object or nil.

Description:

Returns the home package of symbol.

Examples:

 (in-package "CL-USER") → #<PACKAGE "COMMON-LISP-USER">
 (symbol-package 'car) → #<PACKAGE "COMMON-LISP">
 (symbol-package 'bus) → #<PACKAGE "COMMON-LISP-USER">
 (symbol-package :optional) → #<PACKAGE "KEYWORD">
 ;; Gensyms are uninterned, so have no home package.
 (symbol-package (gensym)) → NIL
 (make-package 'pk1) → #<PACKAGE "PK1">
 (intern "SAMPLE1" "PK1") → PK1::SAMPLE1, NIL
 (export (find-symbol "SAMPLE1" "PK1") "PK1") → T
 (make-package 'pk2 :use '(pk1)) → #<PACKAGE "PK2">
 (find-symbol "SAMPLE1" "PK2") → PK1:SAMPLE1, :INHERITED
 (symbol-package 'pk1::sample1) → #<PACKAGE "PK1">
 (symbol-package 'pk2::sample1) → #<PACKAGE "PK1">
 (symbol-package 'pk1::sample2) → #<PACKAGE "PK1">
 (symbol-package 'pk2::sample2) → #<PACKAGE "PK2">
 ;; The next several forms create a scenario in which a symbol
 ;; is not really uninterned, but is "apparently uninterned",
 ;; and so SYMBOL-PACKAGE still returns NIL.
 (setq s3 'pk1::sample3) → PK1::SAMPLE3
 (import s3 'pk2) → T
 (unintern s3 'pk1) → T
 (symbol-package s3) → NIL
 (eq s3 'pk2::sample3) → T

Affected By:

import, intern, unintern

Exceptional Situations:

Should signal an error of type type-error if symbol is not a symbol.

See Also:

intern