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-<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Macros</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><meta name="keywords" content=" ISO C++ , library " /><link rel="home" href="../spine.html" title="The GNU C++ Library Documentation" /><link rel="up" href="using.html" title="Chapter 3. Using" /><link rel="prev" href="using_namespaces.html" title="Namespaces" /><link rel="next" href="using_concurrency.html" title="Concurrency" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Macros</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="using_namespaces.html">Prev</a> </td><th width="60%" align="center">Chapter 3. Using</th><td width="20%" align="right"> <a accesskey="n" href="using_concurrency.html">Next</a></td></tr></table><hr /></div><div class="sect1" title="Macros"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="manual.intro.using.macros"></a>Macros</h2></div></div></div><p>All pre-processor switches and configurations are all gathered
- in the file <code class="code">c++config.h</code>, which is generated during
- the libstdc++ configuration and build process, and included by
- files part of the public libstdc++ API. Most of these macros
+<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Macros</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><meta name="keywords" content=" ISO C++ , library " /><link rel="home" href="../spine.html" title="The GNU C++ Library Documentation" /><link rel="up" href="using.html" title="Chapter 3. Using" /><link rel="prev" href="using_headers.html" title="Headers" /><link rel="next" href="using_namespaces.html" title="Namespaces" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Macros</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="using_headers.html">Prev</a> </td><th width="60%" align="center">Chapter 3. Using</th><td width="20%" align="right"> <a accesskey="n" href="using_namespaces.html">Next</a></td></tr></table><hr /></div><div class="sect1" title="Macros"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="manual.intro.using.macros"></a>Macros</h2></div></div></div><p>
+ All library macros begin with <code class="code">_GLIBCXX_</code>.
+ </p><p>
+ Furthermore, all pre-processor macros, switches, and
+ configuration options are gathered in the
+ file <code class="filename">c++config.h</code>, which
+ is generated during the libstdc++ configuration and build
+ process. This file is then included when needed by files part of
+ the public libstdc++ API, like <ios>. Most of these macros
should not be used by consumers of libstdc++, and are reserved
- for internal implementation use. <span class="emphasis"><em>These macros cannot be
- redefined</em></span>. However, a select handful of these macro
- control libstdc++ extensions and extra features, or provide
- versioning information for the API, and are able to be used.
- </p><p>All library macros begin with <code class="code">_GLIBCXX_</code> (except for
- versions 3.1.x to 3.3.x, which use <code class="code">_GLIBCPP_</code>).
+ for internal implementation use. <span class="emphasis"><em>These macros cannot
+ be redefined</em></span>.
+ </p><p>
+ A select handful of macros control libstdc++ extensions and extra
+ features, or provide versioning information for the API. Only
+ those macros listed below are offered for consideration by the
+ general public.
</p><p>Below is the macro which users may check for library version
information. </p><div class="variablelist"><dl><dt><span class="term"><code class="code">__GLIBCXX__</code></span></dt><dd><p>The current version of
libstdc++ in compressed ISO date format, form of an unsigned
building/installing the library.
</p><div class="variablelist"><dl><dt><span class="term"><code class="code">_GLIBCXX_DEPRECATED</code></span></dt><dd><p>
Defined by default. Not configurable. ABI-changing. Turning this off
- removes older ARM-style iostreams code, and other anachronisms
- from the API. This macro is dependent on the version of the
- standard being tracked, and as a result may give different results for
- <code class="code">-std=c++98</code> and <code class="code">-std=c++0x</code>. This may
- be useful in updating old C++ code which no longer meet the
- requirements of the language, or for checking current code
- against new language standards.
+ removes older ARM-style iostreams code, and other anachronisms
+ from the API. This macro is dependent on the version of the
+ standard being tracked, and as a result may give different results for
+ <code class="code">-std=c++98</code> and <code class="code">-std=c++0x</code>. This may
+ be useful in updating old C++ code which no longer meet the
+ requirements of the language, or for checking current code
+ against new language standards.
</p></dd><dt><span class="term"><code class="code">_GLIBCXX_FORCE_NEW</code></span></dt><dd><p>
Undefined by default. When defined, memory allocation and
allocators controlled by libstdc++ call operator new/delete
</p></dd><dt><span class="term"><code class="code">_GLIBCXX_PARALLEL</code></span></dt><dd><p>Undefined by default. When defined, compiles user code
using the <a class="link" href="parallel_mode.html" title="Chapter 31. Parallel Mode">parallel
mode</a>.
- </p></dd></dl></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="using_namespaces.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="using.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="using_concurrency.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Namespaces </td><td width="20%" align="center"><a accesskey="h" href="../spine.html">Home</a></td><td width="40%" align="right" valign="top"> Concurrency</td></tr></table></div></body></html>
+ </p></dd><dt><span class="term"><code class="code">_GLIBCXX_PROFILE</code></span></dt><dd><p>Undefined by default. When defined, compiles user code
+ using the <a class="link" href="profile_mode.html" title="Chapter 32. Profile Mode">profile
+ mode</a>.
+ </p></dd></dl></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="using_headers.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="using.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="using_namespaces.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Headers </td><td width="20%" align="center"><a accesskey="h" href="../spine.html">Home</a></td><td width="40%" align="right" valign="top"> Namespaces</td></tr></table></div></body></html>
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