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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="C++%20Attributes">C++ Attributes</a>,Next:&nbsp;<a rel="next" accesskey="n" href="Strong-Using.html#Strong%20Using">Strong Using</a>,Previous:&nbsp;<a rel="previous" accesskey="p" href="Bound-member-functions.html#Bound%20member%20functions">Bound member functions</a>,Up:&nbsp;<a rel="up" accesskey="u" href="C---Extensions.html#C++%20Extensions">C++ Extensions</a><hr><br></div><h3 class="section">C++-Specific Variable, Function, and Type Attributes</h3><p>Some attributes only make sense for C++ programs.     <dl><dt><code>init_priority (</code><var>priority</var><code>)</code>     <dd>     <p>In Standard C++, objects defined at namespace scope are guaranteed to beinitialized in an order in strict accordance with that of their definitions<em>in a given translation unit</em>.  No guarantee is made for initializationsacross translation units.  However, GNU C++ allows users to control theorder of initialization of objects defined at namespace scope with the<code>init_priority</code> attribute by specifying a relative <var>priority</var>,a constant integral expression currently bounded between 101 and 65535inclusive.  Lower numbers indicate a higher priority.     <p>In the following example, <code>A</code> would normally be created before<code>B</code>, but the <code>init_priority</code> attribute has reversed that order:     <pre class="smallexample">          Some_Class  A  __attribute__ ((init_priority (2000)));          Some_Class  B  __attribute__ ((init_priority (543)));          </pre>     <p>Note that the particular values of <var>priority</var> do not matter; only theirrelative ordering.     <br><dt><code>java_interface</code>     <dd>     <p>This type attribute informs C++ that the class is a Java interface.  It mayonly be applied to classes declared within an <code>extern "Java"</code> block. Calls to methods declared in this interface will be dispatched using GCJ'sinterface table mechanism, instead of regular virtual table dispatch.   </dl>   <p>See also See <a href="Strong-Using.html#Strong%20Using">Strong Using</a>.   </body></html>
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