ceph/src/boost/libs/math/doc/html/math_toolkit/float128/typeinfo.html

   1 <html>
   2 <head>
   3 <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
   4 <title>typeinfo</title>
   5 <link rel="stylesheet" href="../../math.css" type="text/css">
   6 <meta name="generator" content="DocBook XSL Stylesheets V1.77.1">
   7 <link rel="home" href="../../index.html" title="Math Toolkit 2.5.1">
   8 <link rel="up" href="../float128.html" title="Implementation of Float128 type">
   9 <link rel="prev" href="exp_function.html" title="Exponential function">
  10 <link rel="next" href="../../constants.html" title="Chapter&#160;4.&#160;Mathematical Constants">
  11 </head>
  12 <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
  13 <table cellpadding="2" width="100%"><tr>
  14 <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../boost.png"></td>
  15 <td align="center"><a href="../../../../../../index.html">Home</a></td>
  16 <td align="center"><a href="../../../../../../libs/libraries.htm">Libraries</a></td>
  17 <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td>
  18 <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td>
  19 <td align="center"><a href="../../../../../../more/index.htm">More</a></td>
  20 </tr></table>
  21 <hr>
  22 <div class="spirit-nav">
  23 <a accesskey="p" href="exp_function.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../float128.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="../../constants.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a>
  24 </div>
  25 <div class="section">
  26 <div class="titlepage"><div><div><h3 class="title">
  27 <a name="math_toolkit.float128.typeinfo"></a><a class="link" href="typeinfo.html" title="typeinfo"><code class="computeroutput"><span class="identifier">typeinfo</span></code></a>
  28 </h3></div></div></div>
  29 <p>
  30         For GCC 4.8.1 it was not yet possible to use <code class="computeroutput"><span class="identifier">typeinfo</span></code>
  31         for <code class="computeroutput"><span class="identifier">float_128</span></code> on GCC: see
  32         <a href="http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43622" target="_top">GCC 43622</a>.
  33       </p>
  34 <p>
  35         So this code (to display the mangled name) failed to link <code class="computeroutput"><span class="identifier">undefined</span>
  36         <span class="identifier">reference</span> <span class="identifier">to</span>
  37         <span class="identifier">typeinfo</span> <span class="keyword">for</span>
  38         <span class="identifier">__float128</span></code>
  39       </p>
  40 <pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="keyword">typeid</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">float128_t</span><span class="special">).</span><span class="identifier">name</span><span class="special">()</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
  41 </pre>
  42 <p>
  43         This prevent using the existing tests for Boost.Math distributions, (unless
  44         a few lines are commented out) and if a MACRO BOOST_MATH_INSTRUMENT controlling
  45         them is defined then some diagnostic displays in Boost.Math will not work.
  46       </p>
  47 <p>
  48         However this was only used for display purposes and could be commented out
  49         until this was fixed in GCC 5.
  50       </p>
  51 <div class="tip"><table border="0" summary="Tip">
  52 <tr>
  53 <td rowspan="2" align="center" valign="top" width="25"><img alt="[Tip]" src="../../../../../../doc/src/images/tip.png"></td>
  54 <th align="left">Tip</th>
  55 </tr>
  56 <tr><td align="left" valign="top"><p>
  57           Not all managed names can be <span class="bold"><strong>displayed</strong></span>
  58           using <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span></code>.
  59         </p></td></tr>
  60 </table></div>
  61 </div>
  62 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
  63 <td align="left"></td>
  64 <td align="right"><div class="copyright-footer">Copyright &#169; 2006-2010, 2012-2014 Nikhar Agrawal,
  65       Anton Bikineev, Paul A. Bristow, Marco Guazzone, Christopher Kormanyos, Hubert
  66       Holin, Bruno Lalande, John Maddock, Jeremy Murphy, Johan R&#229;de, Gautam Sewani,
  67       Benjamin Sobotta, Thijs van den Berg, Daryle Walker and Xiaogang Zhang<p>
  68         Distributed under the Boost Software License, Version 1.0. (See accompanying
  69         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>)
  70       </p>
  71 </div></td>
  72 </tr></table>
  73 <hr>
  74 <div class="spirit-nav">
  75 <a accesskey="p" href="exp_function.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../float128.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="../../constants.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a>
  76 </div>
  77 </body>
  78 </html>