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132 lines
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<!-- 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 DELETE-PACKAGE</TITLE>
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<H1><A REV=MADE HREF="http://www.lispworks.com/"><IMG WIDTH=80 HEIGHT=65 ALT="[LISPWORKS]" SRC="../Graphics/LWSmall.gif" ALIGN=Bottom></A><A REL=TOP HREF="../Front/index.htm"><IMG WIDTH=237 HEIGHT=65 ALT="[Common Lisp HyperSpec (TM)]" SRC="../Graphics/CLHS_Sm.gif" ALIGN=Bottom></A> <A REL=PREV HREF="f_shdw_i.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="c_packag.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="f_mk_pkg.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Next]" SRC="../Graphics/Next.gif" ALIGN=Bottom></A></H1>
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<HR>
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<A NAME="delete-package"><I>Function</I> <B>DELETE-PACKAGE</B></A> <P>
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<P>
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<P><B>Syntax:</B><P>
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<P>
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<B>delete-package</B> <I>package</I> => <I>generalized-boolean</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>package</I>---a <A REL=DEFINITION HREF="26_glo_p.htm#package_designator"><I>package designator</I></A>. <P>
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<I>generalized-boolean</I>---a <A REL=DEFINITION HREF="26_glo_g.htm#generalized_boolean"><I>generalized boolean</I></A>. <P>
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<P><B>Description:</B><P>
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<P>
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<A REL=DEFINITION HREF="#delete-package"><B>delete-package</B></A> deletes <I>package</I> from all package system data structures. If the operation is successful, <A REL=DEFINITION HREF="#delete-package"><B>delete-package</B></A> returns true, otherwise <A REL=DEFINITION HREF="a_nil.htm#nil"><B>nil</B></A>. The effect of <A REL=DEFINITION HREF="#delete-package"><B>delete-package</B></A> is that the name and nicknames of <I>package</I> cease to be recognized package names. The package <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>object</I></A> is still a <A REL=DEFINITION HREF="26_glo_p.htm#package"><I>package</I></A> (i.e., <A REL=DEFINITION HREF="f_pkgp.htm#packagep"><B>packagep</B></A> is <A REL=DEFINITION HREF="26_glo_t.htm#true"><I>true</I></A> of it) but <A REL=DEFINITION HREF="f_pkg_na.htm#package-name"><B>package-name</B></A> returns <A REL=DEFINITION HREF="a_nil.htm#nil"><B>nil</B></A>. The consequences of deleting the <TT>COMMON-LISP</TT> package or the <TT>KEYWORD</TT> package are undefined. The consequences of invoking any other package operation on <I>package</I> once it has been deleted are unspecified. In particular, the consequences of invoking <A REL=DEFINITION HREF="f_find_s.htm#find-symbol"><B>find-symbol</B></A>, <A REL=DEFINITION HREF="f_intern.htm#intern"><B>intern</B></A> and other functions that look for a symbol name in a <A REL=DEFINITION HREF="26_glo_p.htm#package"><I>package</I></A> are unspecified if they are called with <A REL=DEFINITION HREF="v_pkg.htm#STpackageST"><B>*package*</B></A> bound to the deleted <I>package</I> or with the deleted <I>package</I> as an argument. <P>
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If <I>package</I> is 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> that has already been deleted, <A REL=DEFINITION HREF="#delete-package"><B>delete-package</B></A> immediately returns <A REL=DEFINITION HREF="a_nil.htm#nil"><B>nil</B></A>. <P>
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After this operation completes, the <A REL=DEFINITION HREF="26_glo_h.htm#home_package"><I>home package</I></A> of any <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A> whose <A REL=DEFINITION HREF="26_glo_h.htm#home_package"><I>home package</I></A> had previously been <I>package</I> is <A REL=DEFINITION HREF="26_glo_i.htm#implementation-dependent"><I>implementation-dependent</I></A>. Except for this, <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbols</I></A> <A REL=DEFINITION HREF="26_glo_a.htm#accessible"><I>accessible</I></A> in <I>package</I> are not modified in any other way; <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbols</I></A> whose <A REL=DEFINITION HREF="26_glo_h.htm#home_package"><I>home package</I></A> is not <I>package</I> remain unchanged. <P>
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<P><B>Examples:</B><P>
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<P>
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<PRE>
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(setq *foo-package* (make-package "FOO" :use nil))
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(setq *foo-symbol* (intern "FOO" *foo-package*))
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(export *foo-symbol* *foo-package*)
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(setq *bar-package* (make-package "BAR" :use '("FOO")))
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(setq *bar-symbol* (intern "BAR" *bar-package*))
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(export *foo-symbol* *bar-package*)
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(export *bar-symbol* *bar-package*)
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(setq *baz-package* (make-package "BAZ" :use '("BAR")))
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(symbol-package *foo-symbol*) => #<PACKAGE "FOO">
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(symbol-package *bar-symbol*) => #<PACKAGE "BAR">
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(prin1-to-string *foo-symbol*) => "FOO:FOO"
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(prin1-to-string *bar-symbol*) => "BAR:BAR"
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(find-symbol "FOO" *bar-package*) => FOO:FOO, :EXTERNAL
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(find-symbol "FOO" *baz-package*) => FOO:FOO, :INHERITED
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(find-symbol "BAR" *baz-package*) => BAR:BAR, :INHERITED
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(packagep *foo-package*) => <A REL=DEFINITION HREF="26_glo_t.htm#true">true</A>
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(packagep *bar-package*) => <A REL=DEFINITION HREF="26_glo_t.htm#true">true</A>
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(packagep *baz-package*) => <A REL=DEFINITION HREF="26_glo_t.htm#true">true</A>
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(package-name *foo-package*) => "FOO"
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(package-name *bar-package*) => "BAR"
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(package-name *baz-package*) => "BAZ"
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(package-use-list *foo-package*) => ()
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(package-use-list *bar-package*) => (#<PACKAGE "FOO">)
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(package-use-list *baz-package*) => (#<PACKAGE "BAR">)
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(package-used-by-list *foo-package*) => (#<PACKAGE "BAR">)
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(package-used-by-list *bar-package*) => (#<PACKAGE "BAZ">)
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(package-used-by-list *baz-package*) => ()
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(delete-package *bar-package*)
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>> Error: Package BAZ uses package BAR.
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>> If continued, BAZ will be made to unuse-package BAR,
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>> and then BAR will be deleted.
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>> Type :CONTINUE to continue.
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>> Debug> :CONTINUE
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=> T
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(symbol-package *foo-symbol*) => #<PACKAGE "FOO">
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(symbol-package *bar-symbol*) is unspecified
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(prin1-to-string *foo-symbol*) => "FOO:FOO"
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(prin1-to-string *bar-symbol*) is unspecified
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(find-symbol "FOO" *bar-package*) is unspecified
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(find-symbol "FOO" *baz-package*) => NIL, NIL
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(find-symbol "BAR" *baz-package*) => NIL, NIL
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(packagep *foo-package*) => T
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(packagep *bar-package*) => T
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(packagep *baz-package*) => T
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(package-name *foo-package*) => "FOO"
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(package-name *bar-package*) => NIL
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(package-name *baz-package*) => "BAZ"
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(package-use-list *foo-package*) => ()
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(package-use-list *bar-package*) is unspecified
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(package-use-list *baz-package*) => ()
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(package-used-by-list *foo-package*) => ()
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(package-used-by-list *bar-package*) is unspecified
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(package-used-by-list *baz-package*) => ()
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</PRE>
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</TT> <P>
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<P><B>Affected By:</B> None.
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<P>
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<P><B>Exceptional Situations:</B><P>
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<P>
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If the <I>package</I> <A REL=DEFINITION HREF="26_glo_d.htm#designator"><I>designator</I></A> is a <A REL=DEFINITION HREF="26_glo_n.htm#name"><I>name</I></A> that does not currently name a <A REL=DEFINITION HREF="26_glo_p.htm#package"><I>package</I></A>, a <A REL=DEFINITION HREF="26_glo_c.htm#correctable"><I>correctable</I></A> error of <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>type</I></A> <A REL=DEFINITION HREF="e_pkg_er.htm#package-error"><B>package-error</B></A> is signaled. If correction is attempted, no deletion action is attempted; instead, <A REL=DEFINITION HREF="#delete-package"><B>delete-package</B></A> immediately returns <A REL=DEFINITION HREF="a_nil.htm#nil"><B>nil</B></A>. <P>
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If <I>package</I> is used by other <A REL=DEFINITION HREF="26_glo_p.htm#package"><I>packages</I></A>, a <A REL=DEFINITION HREF="26_glo_c.htm#correctable"><I>correctable</I></A> error of <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>type</I></A> <A REL=DEFINITION HREF="e_pkg_er.htm#package-error"><B>package-error</B></A> is signaled. If correction is attempted, <A REL=DEFINITION HREF="f_unuse_.htm#unuse-package"><B>unuse-package</B></A> is effectively called to remove any dependencies, causing <I>package</I>'s <A REL=DEFINITION HREF="26_glo_e.htm#external_symbol"><I>external symbols</I></A> to cease being <A REL=DEFINITION HREF="26_glo_a.htm#accessible"><I>accessible</I></A> to those <A REL=DEFINITION HREF="26_glo_p.htm#package"><I>packages</I></A> that use <I>package</I>. <A REL=DEFINITION HREF="#delete-package"><B>delete-package</B></A> then deletes <I>package</I> just as it would have had there been no <A REL=DEFINITION HREF="26_glo_p.htm#package"><I>packages</I></A> that used it. <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_unuse_.htm#unuse-package"><B>unuse-package</B></A> <P>
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<P><B>Notes:</B> None.
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<P>
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<P>
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<P><HR>The following <A REL=META HREF="../Front/X3J13Iss.htm">X3J13 cleanup issues</A>, <I>not part of the specification</I>, apply to this section:<P><UL><LI> <A REL=CHILD HREF="../Issues/iss254.htm">PACKAGE-FUNCTION-CONSISTENCY:MORE-PERMISSIVE</A><LI> <A REL=CHILD HREF="../Issues/iss253.htm">PACKAGE-DELETION:NEW-FUNCTION</A><P></UL><HR>
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<A REL=NAVIGATOR HREF="../Front/StartPts.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Starting Points]" SRC="../Graphics/StartPts.gif" ALIGN=Bottom></A><A REL=TOC HREF="../Front/Contents.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Contents]" SRC="../Graphics/Contents.gif" ALIGN=Bottom></A><A REL=INDEX HREF="../Front/X_Master.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Index]" SRC="../Graphics/Index.gif" ALIGN=Bottom></A><A REL=INDEX HREF="../Front/X_Symbol.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Symbols]" SRC="../Graphics/Symbols.gif" ALIGN=Bottom></A><A REL=GLOSSARY HREF="../Body/26_a.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Glossary]" SRC="../Graphics/Glossary.gif" ALIGN=Bottom></A><A HREF="../Front/X3J13Iss.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Issues]" SRC="../Graphics/Issues.gif" ALIGN=Bottom></A><BR>
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<A REL=COPYRIGHT HREF="../Front/Help.htm#Legal"><I>Copyright 1996-2005, LispWorks Ltd. All rights reserved.</I></A><P>
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