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<title>Visual C++ Debugger Visualizers</title>
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<div class="titlepage"><div><div><h4 class="title">
<a name="boost_multiprecision.tut.misc.visualizers"></a><a class="link" href="visualizers.html" title="Visual C++ Debugger Visualizers">Visual C++
Debugger Visualizers</a>
</h4></div></div></div>
<p>
Let's face it debugger multiprecision numbers is hard - simply because
we can't easily inspect the value of the numbers. Visual C++ provides a
partial solution in the shape of "visualizers" which provide
improved views of complex data structures, these visualizers need to be
added to the <code class="computeroutput"><span class="special">[</span><span class="identifier">Visualizer</span><span class="special">]</span></code> section of <code class="computeroutput"><span class="identifier">autoexp</span><span class="special">.</span><span class="identifier">dat</span></code>
located in the <code class="computeroutput"><span class="identifier">Common7</span><span class="special">/</span><span class="identifier">Packages</span><span class="special">/</span><span class="identifier">Debugger</span></code>
directory of your Visual Studio installation. The actual visualizer code
is in the sandbox <a href="https://svn.boost.org/svn/boost/sandbox/boost_docs/subprojects/DebuggerVisualizers/multiprecision.vis.txt" target="_top">here</a>
- just cut and paste the code into your <code class="computeroutput"><span class="identifier">autoexp</span><span class="special">.</span><span class="identifier">dat</span></code>
file.
</p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>
These visualizers have only been tested with VC10, also given the ability
of buggy visualizers to crash your Visual C++ debugger, make sure you
back up <code class="computeroutput"><span class="identifier">autoexp</span><span class="special">.</span><span class="identifier">dat</span></code> file before using these!!
</p></td></tr>
</table></div>
<p>
The first visualizer provides improved views of <code class="computeroutput"><span class="identifier">debug_adaptor</span></code>:
</p>
<p>
<span class="inlinemediaobject"><img src="../../../../debugger1.png"></span>
</p>
<p>
The next visualizer provides improved views of cpp_int: small numbers are
displayed as actual values, while larger numbers are displayed as an array
of hexadecimal parts, with the most significant part first.
</p>
<p>
Here's what it looks like for small values:
</p>
<p>
<span class="inlinemediaobject"><img src="../../../../debugger4.png"></span>
</p>
<p>
And for larger values:
</p>
<p>
<span class="inlinemediaobject"><img src="../../../../debugger5.png"></span>
</p>
<p>
There is also a <code class="computeroutput"><span class="special">~</span><span class="identifier">raw</span></code>
child member that lets you see the actual members of the class:
</p>
<p>
<span class="inlinemediaobject"><img src="../../../../debugger6.png"></span>
</p>
<p>
The visualizer for <code class="computeroutput"><span class="identifier">cpp_dec_float</span></code>
shows the first few digits of the value in the preview field, and the full
array of digits when you expand the view. As before the <code class="computeroutput"><span class="special">~</span><span class="identifier">raw</span></code> child gives you access to the actual
data members:
</p>
<p>
<span class="inlinemediaobject"><img src="../../../../debugger7.png"></span>
</p>
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<td align="right"><div class="copyright-footer">Copyright © 2002-2013 John Maddock and Christopher Kormanyos<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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