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34 lines
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<TITLE>CLHS: Section 1.4.4.13</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="01_ddl.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="01_dd.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="01_ddn.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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1.4.4.13 The ``Method Signature'' Section of a Dictionary Entry</H2> <P>
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The description of a <A REL=DEFINITION HREF="26_glo_g.htm#generic_function"><I>generic function</I></A> includes descriptions of the <A REL=DEFINITION HREF="26_glo_m.htm#method"><I>methods</I></A> that are defined on that <A REL=DEFINITION HREF="26_glo_g.htm#generic_function"><I>generic function</I></A> by the standard. A method signature is used to describe the <A REL=DEFINITION HREF="26_glo_p.htm#parameter"><I>parameters</I></A> and <A REL=DEFINITION HREF="26_glo_p.htm#parameter_specializer"><I>parameter specializers</I></A> for each <A REL=DEFINITION HREF="26_glo_m.htm#method"><I>method</I></A>. <A REL=DEFINITION HREF="26_glo_m.htm#method"><I>Methods</I></A> defined for the <A REL=DEFINITION HREF="26_glo_g.htm#generic_function"><I>generic function</I></A> must be of the form described by the <A REL=DEFINITION HREF="26_glo_m.htm#method"><I>method</I></A> <A REL=DEFINITION HREF="26_glo_s.htm#signature"><I>signature</I></A>. <P>
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<B>F</B> <I>(<I>x</I> <I>class</I>) (<I>y</I> t) <TT>&optional</TT> <I>z</I> <TT>&key</TT> <I>k</I></I><P>
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<P>
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This <A REL=DEFINITION HREF="26_glo_s.htm#signature"><I>signature</I></A> indicates that this method on the <A REL=DEFINITION HREF="26_glo_g.htm#generic_function"><I>generic function</I></A> <B>F</B> has two <A REL=DEFINITION HREF="26_glo_r.htm#required_parameter"><I>required parameters</I></A>: <I>x</I>, which must be a <A REL=DEFINITION HREF="26_glo_g.htm#generalized_instance"><I>generalized instance</I></A> of the <A REL=DEFINITION HREF="26_glo_c.htm#class"><I>class</I></A> <I>class</I>; and <I>y</I>, which can be any <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>object</I></A> (i.e., a <A REL=DEFINITION HREF="26_glo_g.htm#generalized_instance"><I>generalized instance</I></A> of the <A REL=DEFINITION HREF="26_glo_c.htm#class"><I>class</I></A> <A REL=DEFINITION HREF="t_t.htm#t"><B>t</B></A>). In addition, there is an <A REL=DEFINITION HREF="26_glo_o.htm#optional_parameter"><I>optional parameter</I></A> <I>z</I> and a <A REL=DEFINITION HREF="26_glo_k.htm#keyword_parameter"><I>keyword parameter</I></A> <I>k</I>. This <A REL=DEFINITION HREF="26_glo_s.htm#signature"><I>signature</I></A> also indicates that this method on <TT>F</TT> is a <A REL=DEFINITION HREF="26_glo_p.htm#primary_method"><I>primary method</I></A> and has no <A REL=DEFINITION HREF="26_glo_q.htm#qualifier"><I>qualifiers</I></A>. <P>
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For each <A REL=DEFINITION HREF="26_glo_p.htm#parameter"><I>parameter</I></A>, the <A REL=DEFINITION HREF="26_glo_a.htm#argument"><I>argument</I></A> supplied must be in the intersection of the <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>type</I></A> specified in the description of the corresponding <A REL=DEFINITION HREF="26_glo_g.htm#generic_function"><I>generic function</I></A> and the <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>type</I></A> given in the <A REL=DEFINITION HREF="26_glo_s.htm#signature"><I>signature</I></A> of some <A REL=DEFINITION HREF="26_glo_m.htm#method"><I>method</I></A> (including not only those <A REL=DEFINITION HREF="26_glo_m.htm#method"><I>methods</I></A> defined in this specification, but also <A REL=DEFINITION HREF="26_glo_i.htm#implementation-defined"><I>implementation-defined</I></A> or user-defined <A REL=DEFINITION HREF="26_glo_m.htm#method"><I>methods</I></A> in situations where the definition of such <A REL=DEFINITION HREF="26_glo_m.htm#method"><I>methods</I></A> is permitted). <P>
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