34 lines
6.3 KiB
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34 lines
6.3 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: Section 11.1.1.2.3</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="11_aabb.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="11_aab.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="11_aabd.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Next]" SRC="../Graphics/Next.gif" ALIGN=Bottom></A></H1>
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<H2>
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11.1.1.2.3 Accessibility of Symbols in a Package</H2> <P>
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A <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A> becomes <A REL=DEFINITION HREF="26_glo_a.htm#accessible"><I>accessible</I></A> in a <A REL=DEFINITION HREF="26_glo_p.htm#package"><I>package</I></A> if that is its <A REL=DEFINITION HREF="26_glo_h.htm#home_package"><I>home package</I></A> when it is created, or if it is <I>imported</I> into that <A REL=DEFINITION HREF="26_glo_p.htm#package"><I>package</I></A>, or by inheritance via <A REL=DEFINITION HREF="f_use_pk.htm#use-package"><B>use-package</B></A>. <P>
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If a <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A> is <A REL=DEFINITION HREF="26_glo_a.htm#accessible"><I>accessible</I></A> in a <A REL=DEFINITION HREF="26_glo_p.htm#package"><I>package</I></A>, it can be referred to when using the <A REL=DEFINITION HREF="26_glo_l.htm#lisp_reader"><I>Lisp reader</I></A> without a <A REL=DEFINITION HREF="26_glo_p.htm#package_prefix"><I>package prefix</I></A> when that <A REL=DEFINITION HREF="26_glo_p.htm#package"><I>package</I></A> is the <A REL=DEFINITION HREF="26_glo_c.htm#current_package"><I>current package</I></A>, regardless of whether it is <A REL=DEFINITION HREF="26_glo_p.htm#present"><I>present</I></A> or inherited. <P>
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<A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>Symbols</I></A> from one <A REL=DEFINITION HREF="26_glo_p.htm#package"><I>package</I></A> can be made <A REL=DEFINITION HREF="26_glo_a.htm#accessible"><I>accessible</I></A> in another <A REL=DEFINITION HREF="26_glo_p.htm#package"><I>package</I></A> in two ways. <P>
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<P><DL><DT>-- Any individual <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A> can be added to a <A REL=DEFINITION HREF="26_glo_p.htm#package"><I>package</I></A> by use of <A REL=DEFINITION HREF="f_import.htm#import"><B>import</B></A>. After the call to <A REL=DEFINITION HREF="f_import.htm#import"><B>import</B></A> the <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A> is <A REL=DEFINITION HREF="26_glo_p.htm#present"><I>present</I></A> in the importing <A REL=DEFINITION HREF="26_glo_p.htm#package"><I>package</I></A>. The status of the <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A> in the <A REL=DEFINITION HREF="26_glo_p.htm#package"><I>package</I></A> it came from (if any) is unchanged, and the <A REL=DEFINITION HREF="26_glo_h.htm#home_package"><I>home package</I></A> for this <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A> is unchanged. Once <I>imported</I>, a <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A> is <A REL=DEFINITION HREF="26_glo_p.htm#present"><I>present</I></A> in the importing <A REL=DEFINITION HREF="26_glo_p.htm#package"><I>package</I></A> and can be removed only by calling <A REL=DEFINITION HREF="f_uninte.htm#unintern"><B>unintern</B></A>. <P><DD>
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A <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A> is <I>shadowed</I>[3] by another <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A> in some <A REL=DEFINITION HREF="26_glo_p.htm#package"><I>package</I></A> if the first <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A> would be <A REL=DEFINITION HREF="26_glo_a.htm#accessible"><I>accessible</I></A> by inheritance if not for the presence of the second <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A>. See <A REL=DEFINITION HREF="f_shdw_i.htm#shadowing-import"><B>shadowing-import</B></A>. <P>
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<DT>-- The second mechanism for making <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbols</I></A> from one <A REL=DEFINITION HREF="26_glo_p.htm#package"><I>package</I></A> <A REL=DEFINITION HREF="26_glo_a.htm#accessible"><I>accessible</I></A> in another is provided by <A REL=DEFINITION HREF="f_use_pk.htm#use-package"><B>use-package</B></A>. All of the <A REL=DEFINITION HREF="26_glo_e.htm#external_symbol"><I>external symbols</I></A> of the used <A REL=DEFINITION HREF="26_glo_p.htm#package"><I>package</I></A> are inherited by the using <A REL=DEFINITION HREF="26_glo_p.htm#package"><I>package</I></A>. The <A REL=DEFINITION HREF="26_glo_f.htm#function"><I>function</I></A> <A REL=DEFINITION HREF="f_unuse_.htm#unuse-package"><B>unuse-package</B></A> undoes the effects of a previous <A REL=DEFINITION HREF="f_use_pk.htm#use-package"><B>use-package</B></A>. <P><DD></DL><P>
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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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