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<!DOCTYPE HTML PUBLIC "-//W3O//DTD W3 HTML 2.0//EN"><!-- This collection of hypertext pages is Copyright 1995-2005 by Steve Summit. --><!-- Content from the book "C Programming FAQs: Frequently Asked Questions" --><!-- (Addison-Wesley, 1995, ISBN 0-201-84519-9) is made available here by --><!-- permission of the author and the publisher as a service to the community. --><!-- It is intended to complement the use of the published text --><!-- and is protected by international copyright laws. --><!-- The on-line content may be accessed freely for personal use --><!-- but may not be published or retransmitted without explicit permission. --><!-- --><!-- this page built Sat Dec 24 21:47:45 2005 by faqproc version 2.7 --><!-- from source file struct.sgml dated Wed Dec 21 16:15:32 2005 --><!-- corresponding to FAQ list version 4.0 --><html><!-- Mirrored from c-faq.com/struct/opaquetypes.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:58:45 GMT --><head><meta name=GENERATOR content="faqproc"><title>Question 2.4</title><link href="selfref.html" rev=precedes><link href="oop.html" rel=precedes><link href="index.html" rev=subdocument></head><body bgcolor="#ffffff"><a href="selfref.html" rev=precedes><img src="../images/buttonleft.gif" alt="prev"></a><a href="index.html" rev=subdocument><img src="../images/buttonup.gif" alt="up"></a><a href="oop.html" rel=precedes><img src="../images/buttonright.gif" alt="next"></a> <a href="../index-2.html"><img src="../images/buttontop.gif" alt="top/contents"></a><a href="../search.html"><img src="../images/buttonsrch.gif" alt="search"></a><hr><p><!-- qbegin --><h1>comp.lang.c FAQ list<font color=blue>·</font><!-- qtag -->Question 2.4</h1><p><font face=Helvetica size=8 color=blue><b>Q:</b></font>How can I implementopaque (abstract) data types in C?</p><p><hr><p><font face=Helvetica size=8 color=blue><b>A:</b></font>One good way isfor clientsto use structure pointers(perhaps additionally hidden behind typedefs)which point to structure types which are not publicly defined.In other words,a client uses structure pointers(and calls functions accepting and returning structure pointers)without knowinganything aboutwhat the fields of the structure are.(As long asthe details of the structure aren'tneeded--e.g. aslong asthe<TT>-></TT>and<TT>sizeof</TT>operators are not used--Cis perfectly happyto handle pointers to structures ofincomplete type.<a href="jst3.html" rel=subdocument>[footnote]</a>)Only within the source filesimplementing the abstract data typearecomplete declarations for the structures actually in scope.</p><p>See also question <a href="../ansi/structinproto.html">11.5</a>.</p><p>Additional links:<br><br><a href="opaque.examp.html">example</a><br><br><a href="sd1.html" rel=subdocument>slightly shorter, slightly goofier example</a></p><!-- aend --><p><hr><a href="selfref.html" rev=precedes><img src="../images/buttonleft.gif" alt="prev"></a><a href="index.html" rev=subdocument><img src="../images/buttonup.gif" alt="up"></a><a href="oop.html" rel=precedes><img src="../images/buttonright.gif" alt="next"></a> <a href="../questions.html"><img src="../images/buttontop.gif" alt="contents"></a><a href="../search.html"><img src="../images/buttonsrch.gif" alt="search"></a><br><!-- lastfooter --><a href="../about.html">about this FAQ list</a> <a href="../eskimo.html">about eskimo</a> <a href="../search.html">search</a> <a href="../feedback.html">feedback</a> <a href="copyright.html">copyright</a><p>Hosted by<a href="http://www.eskimo.com/"><img src="../../www.eskimo.com/img/link/eskitiny.gif" alt="Eskimo North"></a></body><!-- Mirrored from c-faq.com/struct/opaquetypes.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:58:45 GMT --></html>⌨️ 快捷键说明
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