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128 lines
7.7 KiB
HTML
128 lines
7.7 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2018 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>C++ Extensions (Using the GNU Compiler Collection (GCC))</title>
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<meta name="description" content="C++ Extensions (Using the GNU Compiler Collection (GCC))">
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<meta name="keywords" content="C++ Extensions (Using the GNU Compiler Collection (GCC))">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="index.html#Top" rel="up" title="Top">
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<link href="C_002b_002b-Volatiles.html#C_002b_002b-Volatiles" rel="next" title="C++ Volatiles">
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<link href="Binary-constants.html#Binary-constants" rel="prev" title="Binary constants">
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</head>
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<body lang="en">
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<a name="C_002b_002b-Extensions"></a>
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<div class="header">
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<p>
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Next: <a href="Objective_002dC.html#Objective_002dC" accesskey="n" rel="next">Objective-C</a>, Previous: <a href="C-Extensions.html#C-Extensions" accesskey="p" rel="prev">C Extensions</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Extensions-to-the-C_002b_002b-Language"></a>
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<h2 class="chapter">7 Extensions to the C++ Language</h2>
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<a name="index-extensions_002c-C_002b_002b-language"></a>
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<a name="index-C_002b_002b-language-extensions"></a>
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<p>The GNU compiler provides these extensions to the C++ language (and you
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can also use most of the C language extensions in your C++ programs). If you
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want to write code that checks whether these features are available, you can
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test for the GNU compiler the same way as for C programs: check for a
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predefined macro <code>__GNUC__</code>. You can also use <code>__GNUG__</code> to
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test specifically for GNU C++ (see <a href="http://gcc.gnu.org/onlinedocs/cpp/Common-Predefined-Macros.html#Common-Predefined-Macros">Predefined Macros</a> in <cite>The GNU C Preprocessor</cite>).
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</p>
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<table class="menu" border="0" cellspacing="0">
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<tr><td align="left" valign="top">• <a href="C_002b_002b-Volatiles.html#C_002b_002b-Volatiles" accesskey="1">C++ Volatiles</a>:</td><td> </td><td align="left" valign="top">What constitutes an access to a volatile object.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Restricted-Pointers.html#Restricted-Pointers" accesskey="2">Restricted Pointers</a>:</td><td> </td><td align="left" valign="top">C99 restricted pointers and references.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Vague-Linkage.html#Vague-Linkage" accesskey="3">Vague Linkage</a>:</td><td> </td><td align="left" valign="top">Where G++ puts inlines, vtables and such.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="C_002b_002b-Interface.html#C_002b_002b-Interface" accesskey="4">C++ Interface</a>:</td><td> </td><td align="left" valign="top">You can use a single C++ header file for both
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declarations and definitions.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Template-Instantiation.html#Template-Instantiation" accesskey="5">Template Instantiation</a>:</td><td> </td><td align="left" valign="top">Methods for ensuring that exactly one copy of
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each needed template instantiation is emitted.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Bound-member-functions.html#Bound-member-functions" accesskey="6">Bound member functions</a>:</td><td> </td><td align="left" valign="top">You can extract a function pointer to the
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method denoted by a ‘<samp>->*</samp>’ or ‘<samp>.*</samp>’ expression.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="C_002b_002b-Attributes.html#C_002b_002b-Attributes" accesskey="7">C++ Attributes</a>:</td><td> </td><td align="left" valign="top">Variable, function, and type attributes for C++ only.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Function-Multiversioning.html#Function-Multiversioning" accesskey="8">Function Multiversioning</a>:</td><td> </td><td align="left" valign="top">Declaring multiple function versions.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Type-Traits.html#Type-Traits" accesskey="9">Type Traits</a>:</td><td> </td><td align="left" valign="top">Compiler support for type traits.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="C_002b_002b-Concepts.html#C_002b_002b-Concepts">C++ Concepts</a>:</td><td> </td><td align="left" valign="top">Improved support for generic programming.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Deprecated-Features.html#Deprecated-Features">Deprecated Features</a>:</td><td> </td><td align="left" valign="top">Things will disappear from G++.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Backwards-Compatibility.html#Backwards-Compatibility">Backwards Compatibility</a>:</td><td> </td><td align="left" valign="top">Compatibilities with earlier definitions of C++.
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</td></tr>
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</table>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Objective_002dC.html#Objective_002dC" accesskey="n" rel="next">Objective-C</a>, Previous: <a href="C-Extensions.html#C-Extensions" accesskey="p" rel="prev">C Extensions</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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