80 lines
4.8 KiB
HTML
80 lines
4.8 KiB
HTML
<!-- Common Lisp HyperSpec (TM), version 7.0 generated by Kent M. Pitman on Mon, 11-Apr-2005 2:31am EDT -->
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<TITLE>CLHS: Function SYMBOL-PACKAGE</TITLE>
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<A NAME="symbol-package"><I>Function</I> <B>SYMBOL-PACKAGE</B></A> <P>
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<P><B>Syntax:</B><P>
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<P>
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<B>symbol-package</B> <I>symbol</I> => <I>contents</I><P>
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<P>
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<P><B>Arguments and Values:</B><P>
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<P>
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<I>symbol</I>---a <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A>. <P>
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<I>contents</I>---a <A REL=DEFINITION HREF="26_glo_p.htm#package"><I>package</I></A> <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>object</I></A> or <A REL=DEFINITION HREF="a_nil.htm#nil"><B>nil</B></A>. <P>
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<P><B>Description:</B><P>
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<P>
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Returns the <A REL=DEFINITION HREF="26_glo_h.htm#home_package"><I>home package</I></A> of <I>symbol</I>. <P>
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<P><B>Examples:</B><P>
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<P>
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<PRE>
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(in-package "CL-USER") => #<PACKAGE "COMMON-LISP-USER">
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(symbol-package 'car) => #<PACKAGE "COMMON-LISP">
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(symbol-package 'bus) => #<PACKAGE "COMMON-LISP-USER">
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(symbol-package :optional) => #<PACKAGE "KEYWORD">
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;; Gensyms are uninterned, so have no home package.
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(symbol-package (gensym)) => NIL
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(make-package 'pk1) => #<PACKAGE "PK1">
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(intern "SAMPLE1" "PK1") => PK1::SAMPLE1, NIL
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(export (find-symbol "SAMPLE1" "PK1") "PK1") => T
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(make-package 'pk2 :use '(pk1)) => #<PACKAGE "PK2">
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(find-symbol "SAMPLE1" "PK2") => PK1:SAMPLE1, :INHERITED
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(symbol-package 'pk1::sample1) => #<PACKAGE "PK1">
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(symbol-package 'pk2::sample1) => #<PACKAGE "PK1">
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(symbol-package 'pk1::sample2) => #<PACKAGE "PK1">
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(symbol-package 'pk2::sample2) => #<PACKAGE "PK2">
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;; The next several forms create a scenario in which a symbol
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;; is not really uninterned, but is "apparently uninterned",
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;; and so SYMBOL-PACKAGE still returns NIL.
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(setq s3 'pk1::sample3) => PK1::SAMPLE3
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(import s3 'pk2) => T
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(unintern s3 'pk1) => T
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(symbol-package s3) => NIL
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(eq s3 'pk2::sample3) => T
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</PRE>
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</TT> <P>
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<P><B>Side Effects:</B> None.
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<P>
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<P><B>Affected By:</B><P>
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<P>
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<A REL=DEFINITION HREF="f_import.htm#import"><B>import</B></A>, <A REL=DEFINITION HREF="f_intern.htm#intern"><B>intern</B></A>, <A REL=DEFINITION HREF="f_uninte.htm#unintern"><B>unintern</B></A> <P>
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<P><B>Exceptional Situations:</B><P>
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<P>
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Should signal an error of <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>type</I></A> <A REL=DEFINITION HREF="e_tp_err.htm#type-error"><B>type-error</B></A> if <I>symbol</I> is not a <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A>. <P>
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<P><B>See Also:</B><P>
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<P>
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<A REL=DEFINITION HREF="f_intern.htm#intern"><B>intern</B></A> <P>
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<P><B>Notes:</B> None.
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