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56 lines
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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>19. Structures</TITLE>
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<BODY>
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<meta name="description" value=" Structures">
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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=tex2html3620 HREF="node169.html"><IMG ALIGN=BOTTOM ALT="next" SRC="icons/next_motif.gif"></A> <A NAME=tex2html3618 HREF="clm.html"><IMG ALIGN=BOTTOM ALT="up" SRC="icons/up_motif.gif"></A> <A NAME=tex2html3612 HREF="node167.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="icons/previous_motif.gif"></A> <A NAME=tex2html3622 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="contents" SRC="icons/contents_motif.gif"></A> <A NAME=tex2html3623 HREF="index.html"><IMG ALIGN=BOTTOM ALT="index" SRC="icons/index_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME=tex2html3621 HREF="node169.html"> Introduction to Structures</A>
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<B>Up:</B> <A NAME=tex2html3619 HREF="clm.html">Common Lisp the Language</A>
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<B> Previous:</B> <A NAME=tex2html3613 HREF="node167.html"> String Construction and </A>
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<HR> <P>
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<H1><A NAME=SECTION002300000000000000000>19. Structures</A></H1>
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<P>
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Common Lisp provides a facility for creating named record structures
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with named components. In effect, the user can define a new data type;
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every data structure of that type has components with specified names.
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Constructor, access, and assignment constructs are automatically
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defined when the data type is defined.
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<P>
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This chapter is divided into two parts. The first part discusses
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the basics of the structure facility, which is very simple and allows
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the user to take advantage of the type-checking, modularity, and
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convenience of user-defined record data types. The second part,
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beginning with section <A HREF="node173.html#DefstructHairyStuff">19.5</A>,
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discusses a number of specialized features of the facility that
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have advanced applications. These features are completely optional,
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and you needn't even know they exist in order to take
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advantage of the basics.
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<P>
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<HR>
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<UL>
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<LI> <A NAME=tex2html3624 HREF="node169.html#SECTION002310000000000000000"> Introduction to Structures</A>
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<LI> <A NAME=tex2html3625 HREF="node170.html#SECTION002320000000000000000"> How to Use Defstruct</A>
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<LI> <A NAME=tex2html3626 HREF="node171.html#SECTION002330000000000000000"> Using the Automatically Defined Constructor Function</A>
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<LI> <A NAME=tex2html3627 HREF="node172.html#SECTION002340000000000000000"> Defstruct Slot-Options</A>
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<LI> <A NAME=tex2html3628 HREF="node173.html#SECTION002350000000000000000"> Defstruct Options</A>
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<LI> <A NAME=tex2html3629 HREF="node174.html#SECTION002360000000000000000"> By-Position Constructor Functions</A>
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<LI> <A NAME=tex2html3630 HREF="node175.html#SECTION002370000000000000000"> Structures of Explicitly Specified Representational Type</A>
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<UL>
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<LI> <A NAME=tex2html3631 HREF="node176.html#SECTION002371000000000000000"> Unnamed Structures</A>
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<LI> <A NAME=tex2html3632 HREF="node177.html#SECTION002372000000000000000"> Named Structures</A>
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<LI> <A NAME=tex2html3633 HREF="node178.html#SECTION002373000000000000000"> Other Aspects of Explicitly Specified Structures</A>
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</UL>
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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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