51 lines
2.6 KiB
HTML
51 lines
2.6 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3O//DTD W3 HTML 2.0//EN">
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<!Converted with LaTeX2HTML 0.6.5 (Tue Nov 15 1994) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds >
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<HEAD>
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<TITLE>26.12. Miscellaneous Features</TITLE>
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</HEAD>
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<BODY>
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<meta name="description" value=" Miscellaneous Features">
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<meta name="keywords" value="clm">
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<meta name="resource-type" value="document">
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<meta name="distribution" value="global">
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<P>
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<b>Common Lisp the Language, 2nd Edition</b>
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<BR> <HR><A NAME=tex2html4686 HREF="node251.html"><IMG ALIGN=BOTTOM ALT="next" SRC="icons/next_motif.gif"></A> <A NAME=tex2html4684 HREF="node235.html"><IMG ALIGN=BOTTOM ALT="up" SRC="icons/up_motif.gif"></A> <A NAME=tex2html4680 HREF="node249.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="icons/previous_motif.gif"></A> <A NAME=tex2html4688 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="contents" SRC="icons/contents_motif.gif"></A> <A NAME=tex2html4689 HREF="index.html"><IMG ALIGN=BOTTOM ALT="index" SRC="icons/index_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME=tex2html4687 HREF="node251.html"> Data Types</A>
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<B>Up:</B> <A NAME=tex2html4685 HREF="node235.html"> Loop</A>
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<B> Previous:</B> <A NAME=tex2html4681 HREF="node249.html"> Unconditional Execution</A>
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<HR> <P>
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<H1><A NAME=SECTION0030120000000000000000>26.12. Miscellaneous Features</A></H1>
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<P>
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<img align=bottom alt="change_begin" src="gif/change_begin.gif"><br>
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<A NAME=LOOPMISCSECTION>The</A>
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Loop Facility provides the <tt>named</tt> construct to name a loop so that
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the Common Lisp special form <tt>return-from</tt> can be used.
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<P>
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The loop keywords <tt>initially</tt> and <tt>finally</tt> designate loop constructs that cause
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expressions to be evaluated before and after the loop body, respectively.
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<P>
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The code for any <tt>initially</tt> clauses is collected
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into one <tt>progn</tt> in the order in which the clauses appeared in
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the loop. The collected code is executed once in the loop prologue
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after any implicit variable initializations.
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<P>
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The code for any <tt>finally</tt> clauses is collected
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into one <tt>progn</tt> in the order in which the clauses appeared in
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the loop. The collected code is executed once in the loop epilogue
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before any implicit values are returned from the accumulation clauses.
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Explicit returns in the loop body, however, will exit the loop
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without executing the epilogue code.
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<P>
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<br><img align=bottom alt="change_end" src="gif/change_end.gif">
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<HR>
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<UL>
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<LI> <A NAME=tex2html4690 HREF="node251.html#SECTION0030121000000000000000"> Data Types</A>
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<LI> <A NAME=tex2html4691 HREF="node252.html#SECTION0030122000000000000000"> Destructuring</A>
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</UL>
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<HR>
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<P><ADDRESS>
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AI.Repository@cs.cmu.edu
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</ADDRESS>
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</BODY>
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