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48 lines
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<TITLE>CLHS: Section 3.4.3</TITLE>
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<H2>
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3.4.3 Specialized Lambda Lists</H2> <P>
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A <A REL=DEFINITION HREF="26_glo_s.htm#specialized_lambda_list"><I>specialized lambda list</I></A> is used to <A REL=DEFINITION HREF="26_glo_s.htm#specialize"><I>specialize</I></A> a <A REL=DEFINITION HREF="26_glo_m.htm#method"><I>method</I></A> for a particular <A REL=DEFINITION HREF="26_glo_s.htm#signature"><I>signature</I></A> and to describe how <A REL=DEFINITION HREF="26_glo_a.htm#argument"><I>arguments</I></A> matching that <A REL=DEFINITION HREF="26_glo_s.htm#signature"><I>signature</I></A> are received by the <A REL=DEFINITION HREF="26_glo_m.htm#method"><I>method</I></A>. The <A REL=DEFINITION HREF="26_glo_d.htm#defined_name"><I>defined names</I></A> in the next figure use <A REL=DEFINITION HREF="26_glo_s.htm#specialized_lambda_list"><I>specialized lambda lists</I></A> in some way; see the dictionary entry for each for information about how. <P>
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<PRE>
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<A REL=DEFINITION HREF="m_defmet.htm#defmethod">defmethod</A> <A REL=DEFINITION HREF="m_defgen.htm#defgeneric">defgeneric</A>
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</PRE>
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<P><B>Figure 3-15. Standardized Operators that use Specialized Lambda Lists</B> <P>
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A <A REL=DEFINITION HREF="26_glo_s.htm#specialized_lambda_list"><I>specialized 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>
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<PRE>
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&allow-other-keys &key &rest
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&aux &optional
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</PRE>
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<P><B>Figure 3-16. Lambda List Keywords used by Specialized Lambda Lists</B> <P>
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A <A REL=DEFINITION HREF="26_glo_s.htm#specialized_lambda_list"><I>specialized lambda list</I></A> is syntactically the same as an <A REL=DEFINITION HREF="26_glo_o.htm#ordinary_lambda_list"><I>ordinary lambda list</I></A> except that each <A REL=DEFINITION HREF="26_glo_r.htm#required_parameter"><I>required parameter</I></A> may optionally be associated with a <A REL=DEFINITION HREF="26_glo_c.htm#class"><I>class</I></A> or <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>object</I></A> for which that <A REL=DEFINITION HREF="26_glo_p.htm#parameter"><I>parameter</I></A> is <A REL=DEFINITION HREF="26_glo_s.htm#specialized"><I>specialized</I></A>. <P>
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<P> <PRE>
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lambda-list::= ({var | (var [specializer])}*
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[&optional {var | (var [init-form [supplied-p-parameter]])}*]
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[&rest var]
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[&key {var | ({var | (keyword-name var)} [init-form [supplied-p-parameter]])}* [&allow-other-keys]]
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[&aux {var | (var [init-form])}*])
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</PRE>
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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/iss181.htm">GENERIC-FLET-POORLY-DESIGNED:DELETE</A><P></UL><HR>
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