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>call-next-method | Common Lisp Nova Spec</TITLE
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>Common Lisp Nova Spec</A
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>→ <A HREF="f_call-next-method.html"
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><TABLE WIDTH="100%" CELLSPACING="0" CELLPADDING="0"
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><TR
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><TD ALIGN="LEFT" VALIGN="BASELINE" WIDTH="100%" CLASS="name"
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><SPAN CLASS="idx" DATA-KIND="idxref" DATA-TERM="call-next-method"
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></SPAN
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><B
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>call-next-method</B
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></TD
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><TD ALIGN="RIGHT" VALIGN="BASELINE" WIDTH="0" NOWRAP="NOWRAP" CLASS="ftype"
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><I
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>Local</I
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> <I
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>Function</I
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></TD
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></TR
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></TABLE
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><HR
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></DIV
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><UL CLASS="subtoc"
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></UL
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><DL
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><DT
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><B
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>Syntax</B
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></DT
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><DD
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><P CLASS="j"
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><B
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>call-next-method</B
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> <SPAN CLASS="cmtt"
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>&rest</SPAN
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> <SPAN CLASS="cmssi"
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>args</SPAN
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> <SPAN CLASS="arrow"
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>→</SPAN
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> {<VAR CLASS="param"
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>result</VAR
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>}*</P
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></DD
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><DT
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><B
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>Arguments and Values</B
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></DT
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><DD
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><P CLASS="j"
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><VAR CLASS="param"
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>arg</VAR
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> — an <A HREF="26_1_Glossary.html#object"
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><EM CLASS="term"
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>object</EM
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></A
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>. </P
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><P CLASS="j"
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><VAR CLASS="param"
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>results</VAR
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> — the <A HREF="26_1_Glossary.html#value"
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><EM CLASS="term"
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>values</EM
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></A
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> returned by the <A HREF="26_1_Glossary.html#method"
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><EM CLASS="term"
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>method</EM
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></A
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> it calls.</P
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></DD
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><DT
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><B
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>Description</B
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></DT
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><DD
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><P CLASS="j"
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>The <A HREF="26_1_Glossary.html#function"
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><EM CLASS="term"
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>function</EM
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></A
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> <A HREF="f_call-next-method.html" CLASS="funref"
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><B
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>call-next-method</B
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></A
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> can be used within the body <A HREF="26_1_Glossary.html#form"
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><EM CLASS="term"
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>forms</EM
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></A
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> (but not the <A HREF="26_1_Glossary.html#lambda_list"
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><EM CLASS="term"
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>lambda list</EM
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></A
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>) of a <A HREF="26_1_Glossary.html#method"
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><EM CLASS="term"
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>method</EM
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></A
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> defined by a <A HREF="26_1_Glossary.html#method-defining_form"
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><EM CLASS="term"
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>method-defining form</EM
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></A
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> to call the <A HREF="26_1_Glossary.html#next_method"
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><EM CLASS="term"
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>next method</EM
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></A
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>. </P
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><P CLASS="j"
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>If there is no next <A HREF="26_1_Glossary.html#method"
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><EM CLASS="term"
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>method</EM
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></A
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>, the generic function <A HREF="f_no-next-method.html" CLASS="funref"
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><B
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>no-next-method</B
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></A
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> is called. </P
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><P CLASS="j"
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>The type of method combination used determines which <A HREF="26_1_Glossary.html#method"
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><EM CLASS="term"
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>methods</EM
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></A
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> can invoke <A HREF="f_call-next-method.html" CLASS="funref"
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><B
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>call-next-method</B
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></A
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>. The standard <A HREF="26_1_Glossary.html#method_combination"
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><EM CLASS="term"
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>method combination</EM
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></A
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> type allows <A HREF="f_call-next-method.html" CLASS="funref"
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><B
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>call-next-method</B
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></A
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> to be used within primary <A HREF="26_1_Glossary.html#method"
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><EM CLASS="term"
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>methods</EM
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></A
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> and <A HREF="26_1_Glossary.html#around_method"
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><EM CLASS="term"
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>around methods</EM
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></A
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>. For generic functions using a type of method combination defined by the short form of <A HREF="f_define-method-combination.html" CLASS="macref"
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><B
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>define-method-combination</B
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></A
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>, <A HREF="f_call-next-method.html" CLASS="funref"
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><B
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>call-next-method</B
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></A
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> can be used in <A HREF="26_1_Glossary.html#around_method"
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><EM CLASS="term"
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>around methods</EM
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></A
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> only. </P
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><P CLASS="j"
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>When <A HREF="f_call-next-method.html" CLASS="funref"
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><B
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>call-next-method</B
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></A
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> is called with no arguments, it passes the current <A HREF="26_1_Glossary.html#method"
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><EM CLASS="term"
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>method</EM
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></A
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>’s original arguments to the next <A HREF="26_1_Glossary.html#method"
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><EM CLASS="term"
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>method</EM
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></A
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>. Neither argument defaulting, nor using <A HREF="f_setq.html" CLASS="specref"
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><B
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>setq</B
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></A
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>, nor rebinding variables with the same <A HREF="26_1_Glossary.html#name"
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><EM CLASS="term"
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>names</EM
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></A
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> as parameters of the <A HREF="26_1_Glossary.html#method"
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><EM CLASS="term"
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>method</EM
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></A
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> affects the values <A HREF="f_call-next-method.html" CLASS="funref"
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><B
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>call-next-method</B
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></A
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> passes to the <A HREF="26_1_Glossary.html#method"
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><EM CLASS="term"
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>method</EM
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></A
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> it calls. </P
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><P CLASS="j"
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>When <A HREF="f_call-next-method.html" CLASS="funref"
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><B
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>call-next-method</B
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></A
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> is called with arguments, the <A HREF="26_1_Glossary.html#next_method"
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><EM CLASS="term"
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>next method</EM
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></A
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> is called with those arguments. </P
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><P CLASS="j"
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>If <A HREF="f_call-next-method.html" CLASS="funref"
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><B
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>call-next-method</B
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></A
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> is called with arguments but omits optional arguments, the <A HREF="26_1_Glossary.html#next_method"
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><EM CLASS="term"
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>next method</EM
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></A
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> called defaults those arguments. </P
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><P CLASS="j"
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>The <A HREF="26_1_Glossary.html#function"
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><EM CLASS="term"
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>function</EM
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></A
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> <A HREF="f_call-next-method.html" CLASS="funref"
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><B
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>call-next-method</B
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></A
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> returns any <A HREF="26_1_Glossary.html#value"
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><EM CLASS="term"
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>values</EM
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></A
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> that are returned by the <A HREF="26_1_Glossary.html#next_method"
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><EM CLASS="term"
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>next method</EM
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></A
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>. </P
|
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><P CLASS="j"
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>The <A HREF="26_1_Glossary.html#function"
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><EM CLASS="term"
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>function</EM
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></A
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> <A HREF="f_call-next-method.html" CLASS="funref"
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><B
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>call-next-method</B
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></A
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> has <A HREF="26_1_Glossary.html#lexical_scope"
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><EM CLASS="term"
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>lexical scope</EM
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></A
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> and <A HREF="26_1_Glossary.html#indefinite_extent"
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><EM CLASS="term"
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>indefinite extent</EM
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></A
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> and can only be used within the body of a <A HREF="26_1_Glossary.html#method"
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><EM CLASS="term"
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>method</EM
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></A
|
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> defined by a <A HREF="26_1_Glossary.html#method-defining_form"
|
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><EM CLASS="term"
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>method-defining form</EM
|
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></A
|
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>. </P
|
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><P CLASS="j"
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>Whether or not <A HREF="f_call-next-method.html" CLASS="funref"
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><B
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>call-next-method</B
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></A
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> is <A HREF="26_1_Glossary.html#fbound"
|
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><EM CLASS="term"
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>fbound</EM
|
|
></A
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> in the <A HREF="26_1_Glossary.html#global_environment"
|
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><EM CLASS="term"
|
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>global environment</EM
|
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></A
|
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> is <A HREF="26_1_Glossary.html#implementation-dependent"
|
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><EM CLASS="term"
|
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>implementation-dependent</EM
|
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></A
|
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>; however, the restrictions on redefinition and <A HREF="26_1_Glossary.html#shadow"
|
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><EM CLASS="term"
|
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>shadowing</EM
|
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></A
|
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> of <A HREF="f_call-next-method.html" CLASS="funref"
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><B
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>call-next-method</B
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></A
|
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> are the same as for <A HREF="26_1_Glossary.html#symbol"
|
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><EM CLASS="term"
|
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>symbols</EM
|
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></A
|
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> in the <SPAN CLASS="packref"
|
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><SPAN CLASS="cmtt"
|
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>COMMON-LISP</SPAN
|
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></SPAN
|
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> <A HREF="26_1_Glossary.html#package"
|
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><EM CLASS="term"
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>package</EM
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></A
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> which are <A HREF="26_1_Glossary.html#fbound"
|
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><EM CLASS="term"
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>fbound</EM
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></A
|
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> in the <A HREF="26_1_Glossary.html#global_environment"
|
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><EM CLASS="term"
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>global environment</EM
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></A
|
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>. The consequences of attempting to use <A HREF="f_call-next-method.html" CLASS="funref"
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><B
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>call-next-method</B
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></A
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> outside of a <A HREF="26_1_Glossary.html#method-defining_form"
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><EM CLASS="term"
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>method-defining form</EM
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></A
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> are undefined.</P
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></DD
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><DT
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><B
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|
>Affected By</B
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></DT
|
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><DD
|
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><P CLASS="j"
|
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><A HREF="f_defmethod.html" CLASS="macref"
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><B
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>defmethod</B
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></A
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>, <A HREF="f_call-method.html" CLASS="macref"
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><B
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>call-method</B
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></A
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>, <A HREF="f_define-method-combination.html" CLASS="macref"
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><B
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>define-method-combination</B
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></A
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>.</P
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></DD
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><DT
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><B
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>Exceptional Situations</B
|
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></DT
|
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><DD
|
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><P CLASS="j"
|
|
>When providing arguments to <A HREF="f_call-next-method.html" CLASS="funref"
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><B
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>call-next-method</B
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></A
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>, the following rule must be satisfied or an error of <A HREF="26_1_Glossary.html#type"
|
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><EM CLASS="term"
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>type</EM
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></A
|
|
> <A HREF="t_error.html" CLASS="typeref"
|
|
><B
|
|
>error</B
|
|
></A
|
|
> should be signaled: the ordered set of <A HREF="26_1_Glossary.html#applicable_method"
|
|
><EM CLASS="term"
|
|
>applicable methods</EM
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></A
|
|
> for a changed set of arguments for <A HREF="f_call-next-method.html" CLASS="funref"
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><B
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>call-next-method</B
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></A
|
|
> must be the same as the ordered set of <A HREF="26_1_Glossary.html#applicable_method"
|
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><EM CLASS="term"
|
|
>applicable methods</EM
|
|
></A
|
|
> for the original arguments to the <A HREF="26_1_Glossary.html#generic_function"
|
|
><EM CLASS="term"
|
|
>generic function</EM
|
|
></A
|
|
>. Optimizations of the error checking are possible, but they must not change the semantics of <A HREF="f_call-next-method.html" CLASS="funref"
|
|
><B
|
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>call-next-method</B
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></A
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>.</P
|
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></DD
|
|
><DT
|
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><B
|
|
>See Also</B
|
|
></DT
|
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><DD
|
|
><P CLASS="j"
|
|
><A HREF="f_define-method-combination.html" CLASS="macref"
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><B
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>define-method-combination</B
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></A
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>, <A HREF="f_defmethod.html" CLASS="macref"
|
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><B
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>defmethod</B
|
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></A
|
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>, <A HREF="f_next-method-p.html" CLASS="funref"
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><B
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>next-method-p</B
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></A
|
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>, <A HREF="f_no-next-method.html" CLASS="funref"
|
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><B
|
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>no-next-method</B
|
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></A
|
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>, <A HREF="f_call-method.html" CLASS="macref"
|
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><B
|
|
>call-method</B
|
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></A
|
|
>, <A HREF="7_6_Generic_Functions_and_Methods.html#sec_7_6_6" CLASS="secref"
|
|
><SPAN CLASS="cmr"
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|
>Section</SPAN
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> <SPAN CLASS="cmr"
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>7.6.6</SPAN
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> <SPAN CLASS="cmr"
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>(Method</SPAN
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> <SPAN CLASS="cmr"
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>Selection</SPAN
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> <SPAN CLASS="cmr"
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>and</SPAN
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> <SPAN CLASS="cmr"
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|
>Combination)</SPAN
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></A
|
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>, <A HREF="7_6_Generic_Functions_and_Methods.html#sec_7_6_6_2" CLASS="secref"
|
|
><SPAN CLASS="cmr"
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|
>Section</SPAN
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> <SPAN CLASS="cmr"
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|
>7.6.6.2</SPAN
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> <SPAN CLASS="cmr"
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>(Standard</SPAN
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> <SPAN CLASS="cmr"
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>Method</SPAN
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> <SPAN CLASS="cmr"
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>Combination)</SPAN
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></A
|
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>, <A HREF="7_6_Generic_Functions_and_Methods.html#sec_7_6_6_4" CLASS="secref"
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><SPAN CLASS="cmr"
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>Section</SPAN
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> <SPAN CLASS="cmr"
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>7.6.6.4</SPAN
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> <SPAN CLASS="cmr"
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>(Built-in</SPAN
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> <SPAN CLASS="cmr"
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>Method</SPAN
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> <SPAN CLASS="cmr"
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>Combination</SPAN
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> <SPAN CLASS="cmr"
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>Types)</SPAN
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></A
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></P
|
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></DD
|
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></DL
|
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></DIV
|
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></DIV
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><DIV CLASS="footer"
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><DIV CLASS="btmnav"
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