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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!-- but may not be published or retransmitted without explicit permission.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/sd1.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:59:27 GMT --><head><meta name=GENERATOR content="faqproc"><link href="http://www.eskimo.com/notfound.html" rev=subdocument><title>Opaque type example</title></head><body bgcolor="#ffffff"> <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>For example, you might create this header file,<TT>"mumbletyfrog.h"</TT>,for an abstract type <TT>mumbletyfrog</TT>:<pre>struct mumbletyfrog;extern struct mumbletyfrog *makefrog(void);extern void setcroaks(struct mumbletyfrog *, int);</pre>The caller would include the header file,and manipulate pointers to <TT>struct mumbletyfrog</TT>:<pre>#include "mumbletyfrog.h"...struct mumbletyfrog *frogp;frogp = makefrog();setcroaks(frogp, 3);croaker(frogp);</pre>The code that defines the <TT>mumbletyfrog</TT> type,presumably in <TT>mumbletyfrog.c</TT>,actually defines the structure:<pre>#include "mumbletyfrog.h"struct mumbletyfrog { char *name; int ncroaks; };struct mumbletyfrog *makefrog(void){ struct mumbletyfrog *frogp = malloc(sizeof(struct mumbletyfrog)); if(frogp == NULL) return NULL; frogp->name = NULL; frogp->ncroaks = 0; return frogp;}void setcroaks(struct mumbletyfrog *frogp, int n){ frogp->ncroaks = n;}void croaker(struct mumbletyfrog *frogp){ int i; for(i = 0; i < frogp->ncroaks; i++) printf("ribbet\n");}</pre>Another popular strategy is to use a typedef,so that the keyword <TT>struct</TT> can be omitted;see questions<a href="typedef.html">2.1</a>and<a href="impltypedef.html">2.2</a>.<hr><p><a href="opaquetypes.html" rev=subdocument>back</a></p><hr><p><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><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></p></body><!-- Mirrored from c-faq.com/struct/sd1.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:59:27 GMT --></html>⌨️ 快捷键说明
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