| author | Deepak Modgil <Deepak.Modgil@Nokia.com> |
| Fri, 03 Apr 2009 23:33:03 +0100 | |
| changeset 0 | fb279309251b |
| child 1641 | 2b3996fc09a1 |
| permissions | -rw-r--r-- |
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fb279309251b
DP tools release version Revision: 200912
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN"> |
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> |
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<head> |
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /> |
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<meta http-equiv="Content-Style-Type" content="text/css" /> |
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<meta name="LASTUPDATED" content="06/17/05 11:09:43" /> |
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<title>cpp_extensions</title> |
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<link rel="StyleSheet" href="../../book.css" type="text/css"/> |
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</head> |
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<body> |
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<h3>cpp_extensions</h3> |
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<p> Controls language extensions to ISO C++.</p> |
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<h5>Syntax</h5> |
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<p class="code">#pragma cpp_extensions on | off | reset |
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</p> |
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<h5>Targets</h5> |
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All platforms.<br /> |
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<h5>Remarks</h5> |
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<p>If you enable this pragma, you can use the following extensions to the ANSI C++ standard that would otherwise be illegal:</p> |
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<ul> |
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<li>Anonymous struct & union objects</li> |
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</ul> |
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<blockquote> |
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<div class="listing"> #pragma cpp_extensions on<br /> |
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void foo()<br /> |
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{<br />
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union {<br />
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long hilo;<br /> |
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struct { short hi, lo; }; // anonymous struct<br />
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};<br /> |
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hi=0x1234; <br /> |
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lo=0x5678; // hilo==0x12345678 <br /> |
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}</div> |
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</blockquote> |
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<ul> |
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<li>Unqualified pointer to a member function</li> |
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</ul> |
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<blockquote> |
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<div class="listing"> |
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<p> #pragma cpp_extensions on<br /> |
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struct Foo { void f(); }<br />
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void Foo::f()<br /> |
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{<br />
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void (Foo::*ptmf1)() = &Foo::f; // ALWAYS OK</p> |
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<p> void (Foo::*ptmf2)() = f; // OK if you enable cpp_extensions.<br /> |
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}</p> |
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</div> |
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</blockquote> |
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<ul> |
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<li>Inclusion of const data in precompiled headers.</li> |
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</ul> |
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<p>This pragma does not correspond to any setting . To check this setting, use the <span class="code">__option (cpp_extensions)</span>. This pragma is <span class="code">on</span> if generating Win32/x86-compatible object code; <span class="code">off</span> if not.</p> |
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<p></p> |
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<div id="footer">Copyright © 2009 Nokia Corporation and/or its subsidiary(-ies). All rights reserved. <br>License: <a href="http://www.eclipse.org/legal/epl-v10.html">http://www.eclipse.org/legal/epl-v10.html</a></div> |
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</body> |
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</html> |