offsetof.html

来自「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 代码 · 共 67 行

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<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="Offsetof">Offsetof</a>,Next:&nbsp;<a rel="next" accesskey="n" href="Java-Exceptions.html#Java%20Exceptions">Java Exceptions</a>,Previous:&nbsp;<a rel="previous" accesskey="p" href="Strong-Using.html#Strong%20Using">Strong Using</a>,Up:&nbsp;<a rel="up" accesskey="u" href="C---Extensions.html#C++%20Extensions">C++ Extensions</a><hr><br></div><h3 class="section">Offsetof</h3><p>G++ uses a syntactic extension to implement the <code>offsetof</code> macro.   <p>In particular:<pre class="smallexample">       __offsetof__ (expression)     </pre>   <p>is equivalent to the parenthesized expression, except that theexpression is considered an integral constant expression even if itcontains certain operators that are not normally permitted in anintegral constant expression.  Users should never use<code>__offsetof__</code> directly; the only valid use of<code>__offsetof__</code> is to implement the <code>offsetof</code> macro in<code>&lt;stddef.h&gt;</code>.   </body></html>

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