66 lines
5.9 KiB
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66 lines
5.9 KiB
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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 SHADOWING-IMPORT</TITLE>
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<A NAME="shadowing-import"><I>Function</I> <B>SHADOWING-IMPORT</B></A> <P>
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<P><B>Syntax:</B><P>
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<P>
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<B>shadowing-import</B> <I>symbols <TT>&optional</TT> package</I> => <I><A REL=DEFINITION HREF="a_t.htm#t"><B>t</B></A></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>symbols</I>---a <A REL=DEFINITION HREF="26_glo_d.htm#designator"><I>designator</I></A> for a <A REL=DEFINITION HREF="26_glo_l.htm#list"><I>list</I></A> of <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbols</I></A>. <P>
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<I>package</I> ---a <A REL=DEFINITION HREF="26_glo_p.htm#package_designator"><I>package designator</I></A>. The default is the <A REL=DEFINITION HREF="26_glo_c.htm#current_package"><I>current package</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="#shadowing-import"><B>shadowing-import</B></A> is like <A REL=DEFINITION HREF="f_import.htm#import"><B>import</B></A>, but it does not signal an error even if the importation of a <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A> would shadow some <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A> already <A REL=DEFINITION HREF="26_glo_a.htm#accessible"><I>accessible</I></A> in <I>package</I>. <P>
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<A REL=DEFINITION HREF="#shadowing-import"><B>shadowing-import</B></A> inserts each of <I>symbols</I> into <I>package</I> as an internal symbol, regardless of whether another <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A> of the same name is shadowed by this action. If a different <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A> of the same name is already <A REL=DEFINITION HREF="26_glo_p.htm#present"><I>present</I></A> in <I>package</I>, that <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A> is first <A REL=DEFINITION HREF="26_glo_u.htm#uninterned"><I>uninterned</I></A> from <I>package</I>. The new <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A> is added to <I>package</I>'s shadowing-symbols list. <P>
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<A REL=DEFINITION HREF="#shadowing-import"><B>shadowing-import</B></A> does name-conflict checking to the extent that it checks whether a distinct existing <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A> with the same name is <A REL=DEFINITION HREF="26_glo_a.htm#accessible"><I>accessible</I></A>; if so, it is shadowed by the new <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A>, which implies that it must be uninterned if it was <A REL=DEFINITION HREF="26_glo_p.htm#present"><I>present</I></A> in <I>package</I>. <P>
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<P><B>Examples:</B><P>
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<PRE>
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(in-package "COMMON-LISP-USER") => #<PACKAGE "COMMON-LISP-USER">
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(setq sym (intern "CONFLICT")) => CONFLICT
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(intern "CONFLICT" (make-package 'temp)) => TEMP::CONFLICT, NIL
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(package-shadowing-symbols 'temp) => NIL
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(shadowing-import sym 'temp) => T
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(package-shadowing-symbols 'temp) => (CONFLICT)
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</PRE>
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</TT> <P>
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<P><B>Side Effects:</B><P>
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<P>
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<A REL=DEFINITION HREF="#shadowing-import"><B>shadowing-import</B></A> changes the state of the package system in such a way that the consistency rules do not hold across the change. <P>
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<I>package</I>'s shadowing-symbols list is modified. <P>
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<P><B>Affected By:</B><P>
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<P>
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Current state of the package system. <P>
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<P><B>Exceptional Situations:</B> None.
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<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_import.htm#import"><B>import</B></A>, <A REL=DEFINITION HREF="f_uninte.htm#unintern"><B>unintern</B></A>, <A REL=DEFINITION HREF="f_pkg_sh.htm#package-shadowing-symbols"><B>package-shadowing-symbols</B></A> <P>
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<P><B>Notes:</B> None.
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<P>
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<P><HR>The following <A REL=META HREF="../Front/X3J13Iss.htm">X3J13 cleanup issue</A>, <I>not part of the specification</I>, applies to this section:<P><UL><LI> <A REL=CHILD HREF="../Issues/iss254.htm">PACKAGE-FUNCTION-CONSISTENCY:MORE-PERMISSIVE</A><P></UL><HR>
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