108 lines
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108 lines
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<title>Visual C++ Debugger Visualizers</title>
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<div class="titlepage"><div><div><h4 class="title">
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<a name="boost_multiprecision.tut.misc.visualizers"></a><a class="link" href="visualizers.html" title="Visual C++ Debugger Visualizers">Visual C++
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Debugger Visualizers</a>
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</h4></div></div></div>
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<p>
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Let's face it debugger multiprecision numbers is hard - simply because
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we can't easily inspect the value of the numbers. Visual C++ provides a
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partial solution in the shape of "visualizers" which provide
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improved views of complex data structures, these visualizers need to be
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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>
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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>
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directory of your Visual Studio installation. The actual visualizer code
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is in the sandbox <a href="https://svn.boost.org/svn/boost/sandbox/boost_docs/subprojects/DebuggerVisualizers/multiprecision.vis.txt" target="_top">here</a>
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- 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>
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file.
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</p>
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<div class="note"><table border="0" summary="Note">
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<tr>
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<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../../doc/src/images/note.png"></td>
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<th align="left">Note</th>
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</tr>
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<tr><td align="left" valign="top"><p>
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These visualizers have only been tested with VC10, also given the ability
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of buggy visualizers to crash your Visual C++ debugger, make sure you
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back up <code class="computeroutput"><span class="identifier">autoexp</span><span class="special">.</span><span class="identifier">dat</span></code> file before using these!!
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</p></td></tr>
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</table></div>
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<p>
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The first visualizer provides improved views of <code class="computeroutput"><span class="identifier">debug_adaptor</span></code>:
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</p>
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<p>
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<span class="inlinemediaobject"><img src="../../../../debugger1.png"></span>
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</p>
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<p>
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The next visualizer provides improved views of cpp_int: small numbers are
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displayed as actual values, while larger numbers are displayed as an array
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of hexadecimal parts, with the most significant part first.
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</p>
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<p>
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Here's what it looks like for small values:
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</p>
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<p>
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<span class="inlinemediaobject"><img src="../../../../debugger4.png"></span>
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</p>
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<p>
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And for larger values:
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</p>
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<p>
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<span class="inlinemediaobject"><img src="../../../../debugger5.png"></span>
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</p>
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<p>
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There is also a <code class="computeroutput"><span class="special">~</span><span class="identifier">raw</span></code>
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child member that lets you see the actual members of the class:
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</p>
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<p>
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<span class="inlinemediaobject"><img src="../../../../debugger6.png"></span>
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</p>
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<p>
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The visualizer for <code class="computeroutput"><span class="identifier">cpp_dec_float</span></code>
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shows the first few digits of the value in the preview field, and the full
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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
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data members:
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</p>
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<p>
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<span class="inlinemediaobject"><img src="../../../../debugger7.png"></span>
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</p>
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2002-2019 John Maddock
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and Christopher Kormanyos<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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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</p>
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</div></td>
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</tr></table>
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