52 lines
4.6 KiB
HTML
52 lines
4.6 KiB
HTML
|
<!-- Common Lisp HyperSpec (TM), version 7.0 generated by Kent M. Pitman on Mon, 11-Apr-2005 2:31am EDT -->
|
||
|
|
<HTML>
|
||
|
|
<HEAD>
|
||
|
|
<TITLE>CLHS: Section 3.4.2</TITLE>
|
||
|
|
<LINK HREF="../Data/clhs.css" REL="stylesheet" TYPE="text/css" />
|
||
|
|
<META HTTP-EQUIV="Author" CONTENT="Kent M. Pitman">
|
||
|
|
<META HTTP-EQUIV="Organization" CONTENT="LispWorks Ltd.">
|
||
|
|
<LINK REL=TOP HREF="../Front/index.htm">
|
||
|
|
<LINK REL=COPYRIGHT HREF="../Front/Help.htm#Legal">
|
||
|
|
<LINK REL=DISCLAIMER HREF="../Front/Help.htm#Disclaimer">
|
||
|
|
<LINK REL=PREV HREF="03_daf.htm">
|
||
|
|
<LINK REL=UP HREF="03_d.htm">
|
||
|
|
<LINK REL=NEXT HREF="03_dc.htm">
|
||
|
|
</HEAD>
|
||
|
|
<BODY>
|
||
|
|
<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="03_daf.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="03_d.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="03_dc.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Next]" SRC="../Graphics/Next.gif" ALIGN=Bottom></A></H1>
|
||
|
|
|
||
|
|
<HR>
|
||
|
|
|
||
|
|
<H2>
|
||
|
|
3.4.2 Generic Function Lambda Lists</H2> <P>
|
||
|
|
A <A REL=DEFINITION HREF="26_glo_g.htm#generic_function_lambda_list"><I>generic function lambda list</I></A> is used to describe the overall shape of the argument list to be accepted by a <A REL=DEFINITION HREF="26_glo_g.htm#generic_function"><I>generic function</I></A>. Individual <A REL=DEFINITION HREF="26_glo_m.htm#method"><I>method</I></A> <A REL=DEFINITION HREF="26_glo_s.htm#signature"><I>signatures</I></A> might contribute additional <A REL=DEFINITION HREF="26_glo_k.htm#keyword_parameter"><I>keyword parameters</I></A> to the <A REL=DEFINITION HREF="26_glo_l.htm#lambda_list"><I>lambda list</I></A> of the <A REL=DEFINITION HREF="26_glo_e.htm#effective_method"><I>effective method</I></A>. <P>
|
||
|
|
A <A REL=DEFINITION HREF="26_glo_g.htm#generic_function_lambda_list"><I>generic function lambda list</I></A> is used by <A REL=DEFINITION HREF="m_defgen.htm#defgeneric"><B>defgeneric</B></A>. <P>
|
||
|
|
A <A REL=DEFINITION HREF="26_glo_g.htm#generic_function_lambda_list"><I>generic function lambda list</I></A> has the following syntax: <P>
|
||
|
|
<P> <PRE>
|
||
|
|
lambda-list::= (var*
|
||
|
|
[&optional {var | (var)}*]
|
||
|
|
[&rest var]
|
||
|
|
[&key {var | ({var | (keyword-name var)})}* [&allow-other-keys]])
|
||
|
|
</PRE>
|
||
|
|
<P>
|
||
|
|
A <A REL=DEFINITION HREF="26_glo_g.htm#generic_function_lambda_list"><I>generic function lambda list</I></A> can contain the <A REL=DEFINITION HREF="26_glo_l.htm#lambda_list_keyword"><I>lambda list keywords</I></A> shown in the next figure. <P>
|
||
|
|
<PRE>
|
||
|
|
&allow-other-keys &optional
|
||
|
|
&key &rest
|
||
|
|
</PRE>
|
||
|
|
<P><B>Figure 3-14. Lambda List Keywords used by Generic Function Lambda Lists</B> <P>
|
||
|
|
A <A REL=DEFINITION HREF="26_glo_g.htm#generic_function_lambda_list"><I>generic function lambda list</I></A> differs from an <A REL=DEFINITION HREF="26_glo_o.htm#ordinary_lambda_list"><I>ordinary lambda list</I></A> in the following ways: <P>
|
||
|
|
<P><DL><DT><B>Required arguments</B> <P><DD>
|
||
|
|
Zero or more <A REL=DEFINITION HREF="26_glo_r.htm#required_parameter"><I>required parameters</I></A> must be specified. <P>
|
||
|
|
<DT><B>Optional and keyword arguments</B> <P><DD>
|
||
|
|
<A REL=DEFINITION HREF="26_glo_o.htm#optional_parameter"><I>Optional parameters</I></A> and <A REL=DEFINITION HREF="26_glo_k.htm#keyword_parameter"><I>keyword parameters</I></A> may not have default initial value forms nor use supplied-p parameters. <P>
|
||
|
|
<DT><B>Use of </B><TT>&aux</TT><B></B> <P><DD>
|
||
|
|
The use of <TT>&aux</TT> is not allowed. <P></DL><P>
|
||
|
|
<HR>
|
||
|
|
|
||
|
|
<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>
|
||
|
|
|
||
|
|
<A REL=COPYRIGHT HREF="../Front/Help.htm#Legal"><I>Copyright 1996-2005, LispWorks Ltd. All rights reserved.</I></A><P>
|
||
|
|
</BODY>
|
||
|
|
</HTML>
|