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<html xmlns="http://www.w3.org/1999/xhtml"><head><title>Using</title><meta name="generator" content="DocBook XSL-NS Stylesheets V1.76.1"/><meta name="keywords" content=" C++ , library , debug "/><meta name="keywords" content=" ISO C++ , library "/><meta name="keywords" content=" ISO C++ , runtime , library "/><link rel="home" href="../index.html" title="The GNU C++ Library"/><link rel="up" href="debug_mode.html" title="Chapter 17. Debug Mode"/><link rel="prev" href="bk01pt03ch17s02.html" title="Semantics"/><link rel="next" href="bk01pt03ch17s04.html" title="Design"/></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Using</th></tr><tr><td align="left"><a accesskey="p" href="bk01pt03ch17s02.html">Prev</a> </td><th width="60%" align="center">Chapter 17. Debug Mode</th><td align="right"> <a accesskey="n" href="bk01pt03ch17s04.html">Next</a></td></tr></table><hr/></div><div class="section" title="Using"><div class="titlepage"><div><div><h2 class="title"><a id="manual.ext.debug_mode.using"/>Using</h2></div></div></div><p>
</p><div class="section" title="Using the Debug Mode"><div class="titlepage"><div><div><h3 class="title"><a id="debug_mode.using.mode"/>Using the Debug Mode</h3></div></div></div><p>To use the libstdc++ debug mode, compile your application with the
compiler flag <code class="code">-D_GLIBCXX_DEBUG</code>. Note that this flag
changes the sizes and behavior of standard class templates such
as <code class="code">std::vector</code>, and therefore you can only link code
compiled with debug mode and code compiled without debug mode if no
instantiation of a container is passed between the two translation
units.</p><p>By default, error messages are formatted to fit on lines of about
78 characters. The environment variable
<code class="code">GLIBCXX_DEBUG_MESSAGE_LENGTH</code> can be used to request a
different length.</p></div><div class="section" title="Using a Specific Debug Container"><div class="titlepage"><div><div><h3 class="title"><a id="debug_mode.using.specific"/>Using a Specific Debug Container</h3></div></div></div><p>When it is not feasible to recompile your entire application, or
only specific containers need checking, debugging containers are
available as GNU extensions. These debugging containers are
functionally equivalent to the standard drop-in containers used in
debug mode, but they are available in a separate namespace as GNU
extensions and may be used in programs compiled with either release
mode or with debug mode. The
following table provides the names and headers of the debugging
containers:
</p><div class="table"><a id="id465208"/><p class="title"><strong>Table 17.1. Debugging Containers</strong></p><div class="table-contents"><table summary="Debugging Containers" border="1"><colgroup><col style="text-align: left" class="c1"/><col style="text-align: left" class="c2"/><col style="text-align: left" class="c3"/><col style="text-align: left" class="c4"/></colgroup><thead><tr><th style="text-align: left">Container</th><th style="text-align: left">Header</th><th style="text-align: left">Debug container</th><th style="text-align: left">Debug header</th></tr></thead><tbody><tr><td style="text-align: left"><code class="classname">std::bitset</code></td><td style="text-align: left"><code class="filename">bitset</code></td><td style="text-align: left"><code class="classname">__gnu_debug::bitset</code></td><td style="text-align: left"><code class="filename"><debug/bitset></code></td></tr><tr><td style="text-align: left"><code class="classname">std::deque</code></td><td style="text-align: left"><code class="filename">deque</code></td><td style="text-align: left"><code class="classname">__gnu_debug::deque</code></td><td style="text-align: left"><code class="filename"><debug/deque></code></td></tr><tr><td style="text-align: left"><code class="classname">std::list</code></td><td style="text-align: left"><code class="filename">list</code></td><td style="text-align: left"><code class="classname">__gnu_debug::list</code></td><td style="text-align: left"><code class="filename"><debug/list></code></td></tr><tr><td style="text-align: left"><code class="classname">std::map</code></td><td style="text-align: left"><code class="filename">map</code></td><td style="text-align: left"><code class="classname">__gnu_debug::map</code></td><td style="text-align: left"><code class="filename"><debug/map></code></td></tr><tr><td style="text-align: left"><code class="classname">std::multimap</code></td><td style="text-align: left"><code class="filename">map</code></td><td style="text-align: left"><code class="classname">__gnu_debug::multimap</code></td><td style="text-align: left"><code class="filename"><debug/map></code></td></tr><tr><td style="text-align: left"><code class="classname">std::multiset</code></td><td style="text-align: left"><code class="filename">set</code></td><td style="text-align: left"><code class="classname">__gnu_debug::multiset</code></td><td style="text-align: left"><code class="filename"><debug/set></code></td></tr><tr><td style="text-align: left"><code class="classname">std::set</code></td><td style="text-align: left"><code class="filename">set</code></td><td style="text-align: left"><code class="classname">__gnu_debug::set</code></td><td style="text-align: left"><code class="filename"><debug/set></code></td></tr><tr><td style="text-align: left"><code class="classname">std::string</code></td><td style="text-align: left"><code class="filename">string</code></td><td style="text-align: left"><code class="classname">__gnu_debug::string</code></td><td style="text-align: left"><code class="filename"><debug/string></code></td></tr><tr><td style="text-align: left"><code class="classname">std::wstring</code></td><td style="text-align: left"><code class="filename">string</code></td><td style="text-align: left"><code class="classname">__gnu_debug::wstring</code></td><td style="text-align: left"><code class="filename"><debug/string></code></td></tr><tr><td style="text-align: left"><code class="classname">std::basic_string</code></td><td style="text-align: left"><code class="filename">string</code></td><td style="text-align: left"><code class="classname">__gnu_debug::basic_string</code></td><td style="text-align: left"><code class="filename"><debug/string></code></td></tr><tr><td style="text-align: left"><code class="classname">std::vector</code></td><td style="text-align: left"><code class="filename">vector</code></td><td style="text-align: left"><code class="classname">__gnu_debug::vector</code></td><td style="text-align: left"><code class="filename"><debug/vector></code></td></tr></tbody></table></div></div><br class="table-break"/><p>In addition, when compiling in C++11 mode, these additional
containers have additional debug capability.
</p><div class="table"><a id="id465582"/><p class="title"><strong>Table 17.2. Debugging Containers C++11</strong></p><div class="table-contents"><table summary="Debugging Containers C++11" border="1"><colgroup><col style="text-align: left" class="c1"/><col style="text-align: left" class="c2"/><col style="text-align: left" class="c3"/><col style="text-align: left" class="c4"/></colgroup><thead><tr><th style="text-align: left">Container</th><th style="text-align: left">Header</th><th style="text-align: left">Debug container</th><th style="text-align: left">Debug header</th></tr></thead><tbody><tr><td style="text-align: left"><code class="classname">std::unordered_map</code></td><td style="text-align: left"><code class="filename">unordered_map</code></td><td style="text-align: left"><code class="classname">__gnu_debug::unordered_map</code></td><td style="text-align: left"><code class="filename"><debug/unordered_map></code></td></tr><tr><td style="text-align: left"><code class="classname">std::unordered_multimap</code></td><td style="text-align: left"><code class="filename">unordered_map</code></td><td style="text-align: left"><code class="classname">__gnu_debug::unordered_multimap</code></td><td style="text-align: left"><code class="filename"><debug/unordered_map></code></td></tr><tr><td style="text-align: left"><code class="classname">std::unordered_set</code></td><td style="text-align: left"><code class="filename">unordered_set</code></td><td style="text-align: left"><code class="classname">__gnu_debug::unordered_set</code></td><td style="text-align: left"><code class="filename"><debug/unordered_set></code></td></tr><tr><td style="text-align: left"><code class="classname">std::unordered_multiset</code></td><td style="text-align: left"><code class="filename">unordered_set</code></td><td style="text-align: left"><code class="classname">__gnu_debug::unordered_multiset</code></td><td style="text-align: left"><code class="filename"><debug/unordered_set></code></td></tr></tbody></table></div></div><br class="table-break"/></div></div><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td align="left"><a accesskey="p" href="bk01pt03ch17s02.html">Prev</a> </td><td align="center"><a accesskey="u" href="debug_mode.html">Up</a></td><td align="right"> <a accesskey="n" href="bk01pt03ch17s04.html">Next</a></td></tr><tr><td align="left" valign="top">Semantics </td><td align="center"><a accesskey="h" href="../index.html">Home</a></td><td align="right" valign="top"> Design</td></tr></table></div></body></html>
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