50 lines
2.3 KiB
HTML
50 lines
2.3 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>28.1.3.4. Examples</TITLE>
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</HEAD>
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<BODY>
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<meta name="description" value=" Examples">
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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=tex2html5058 HREF="node273.html"><IMG ALIGN=BOTTOM ALT="next" SRC="icons/next_motif.gif"></A> <A NAME=tex2html5056 HREF="node268.html"><IMG ALIGN=BOTTOM ALT="up" SRC="icons/up_motif.gif"></A> <A NAME=tex2html5052 HREF="node271.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="icons/previous_motif.gif"></A> <A NAME=tex2html5060 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="contents" SRC="icons/contents_motif.gif"></A> <A NAME=tex2html5061 HREF="index.html"><IMG ALIGN=BOTTOM ALT="index" SRC="icons/index_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME=tex2html5059 HREF="node273.html"> Integrating Types and </A>
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<B>Up:</B> <A NAME=tex2html5057 HREF="node268.html"> Inheritance</A>
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<B> Previous:</B> <A NAME=tex2html5053 HREF="node271.html"> Inheritance of Class </A>
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<HR> <P>
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<H3><A NAME=SECTION003213400000000000000>28.1.3.4. Examples</A></H3>
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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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<P><pre>
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(defclass C1 ()
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((S1 :initform 5.4 :type number)
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(S2 :allocation :class)))
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(defclass C2 (C1)
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((S1 :initform 5 :type integer)
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(S2 :allocation :instance)
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(S3 :accessor C2-S3)))
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</pre><P>
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<P>
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Instances of the class <tt>C1</tt> have a local slot named <tt>S1</tt>, whose default
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initial value is 5.4 and whose value should always be a number.
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The class <tt>C1</tt> also has a shared slot named <tt>S2</tt>.
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<P>
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There is a local slot named <tt>S1</tt> in instances of <tt>C2</tt>. The
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default initial value of <tt>S1</tt> is 5. The value of <tt>S1</tt> will be
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of type <tt>(and integer number)</tt>. There are also local slots named
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<tt>S2</tt> and <tt>S3</tt> in instances of <tt>C2</tt>. The class <tt>C2</tt>
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has a method for <tt>C2-S3</tt> for reading the value of slot <tt>S3</tt>;
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there is also a method for <tt>(setf C2-S3)</tt> that writes the
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value of <tt>S3</tt>.
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<br><img align=bottom alt="change_end" src="gif/change_end.gif">
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<P>
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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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