📄 incomplete-enums.html

📁 自己收集的linux入门到学懂高级编程书集包括linux程序设计第三版

💻 HTML

字号:

<html lang="en"><head><title>Using the GNU Compiler Collection (GCC)</title><meta http-equiv="Content-Type" content="text/html"><meta name="description" content="Using the GNU Compiler Collection (GCC)"><meta name="generator" content="makeinfo 4.6"><!--Copyright &copy; 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.   <p>Permission is granted to copy, distribute and/or modify this documentunder the terms of the GNU Free Documentation License, Version 1.2 orany later version published by the Free Software Foundation; with theInvariant Sections being "GNU General Public License" and "FundingFree Software", the Front-Cover texts being (a) (see below), and withthe Back-Cover Texts being (b) (see below).  A copy of the license isincluded in the section entitled "GNU Free Documentation License".   <p>(a) The FSF's Front-Cover Text is:   <p>A GNU Manual   <p>(b) The FSF's Back-Cover Text is:   <p>You have freedom to copy and modify this GNU Manual, like GNU     software.  Copies published by the Free Software Foundation raise     funds for GNU development.--><meta http-equiv="Content-Style-Type" content="text/css"><style type="text/css"><!--  pre.display { font-family:inherit }  pre.format  { font-family:inherit }  pre.smalldisplay { font-family:inherit; font-size:smaller }  pre.smallformat  { font-family:inherit; font-size:smaller }  pre.smallexample { font-size:smaller }  pre.smalllisp    { font-size:smaller }--></style></head><body><div class="node"><p>Node:&nbsp;<a name="Incomplete%20Enums">Incomplete Enums</a>,Next:&nbsp;<a rel="next" accesskey="n" href="Function-Names.html#Function%20Names">Function Names</a>,Previous:&nbsp;<a rel="previous" accesskey="p" href="Alternate-Keywords.html#Alternate%20Keywords">Alternate Keywords</a>,Up:&nbsp;<a rel="up" accesskey="u" href="C-Extensions.html#C%20Extensions">C Extensions</a><hr><br></div><h3 class="section">Incomplete <code>enum</code> Types</h3><p>You can define an <code>enum</code> tag without specifying its possible values. This results in an incomplete type, much like what you get if you write<code>struct foo</code> without describing the elements.  A later declarationwhich does specify the possible values completes the type.   <p>You can't allocate variables or storage using the type while it isincomplete.  However, you can work with pointers to that type.   <p>This extension may not be very useful, but it makes the handling of<code>enum</code> more consistent with the way <code>struct</code> and <code>union</code>are handled.   <p>This extension is not supported by GNU C++.   </body></html>

⌨️ 快捷键说明

复制代码 Ctrl + C

搜索代码 Ctrl + F

全屏模式 F11

切换主题 Ctrl + Shift + D

显示快捷键 ?

增大字号 Ctrl + =

减小字号 Ctrl + -