ceph/src/boost/libs/qvm/doc/deduce_scalar.html

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  14 <h1>QVM: Quaternions, Vectors, Matrices</h1>
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  16 <!-- Copyright (c) 2008-2016 Emil Dotchevski and Reverge Studios, Inc. -->
  17 <!-- Distributed under the Boost Software License, Version 1.0. (See accompanying -->
  18 <!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
  19 <div class="RenoIncludeDIV"><div class="RenoAutoDIV"><h3>deduce_scalar</h3>
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  21 <div class="RenoIncludeDIV"><div class="RenoIncludeDIV"><p><span class="RenoEscape">&#35;<!--<wiki>`&#35;</wiki>--></span>include &lt;<span class="RenoLink"><a href="boost_qvm_deduce_scalar_hpp.html">boost/qvm/deduce_scalar.hpp</a></span>&gt;</p>
  22 <pre>namespace boost
  23 {
  24     namespace <span class="RenoLink"><a href="qvm.html">qvm</a></span>
  25     {
  26 <span class="RenoIncludeSPAN">        <span class="RenoIncludeSPAN">template &lt;class A,class B&gt;
  27         struct <span class="RenoLink">deduce_scalar</span>
  28         {
  29             typedef typename impl&lt;A,B&gt;::type type;
  30         };</span></span>
  31     }
  32 }</pre>
  33 </div></div><h4>Assumptions:</h4>
  34 <p><i>A</i> and <i>B</i> satisfy the <span class="RenoLink"><a href="scalar_requirements.html">scalar requirements</a></span>.</p>
  35 <h4>Returns:</h4>
  36 <p>If <i>A</i> and <i>B</i> are the same type, <i>impl&lt;A,B&gt;::type</i> returns that type. Otherwise, <i>impl&lt;A,B&gt;::type</i> is well defined for the following types only: <i>signed/unsigned char</i>, <i>signed/unsigned short</i>, <i>signed/unsigned int</i>, <i>signed/unsigned long</i>, <i>float</i> and <i>double</i>. The deduction logic is as follows:</p>
  37 <div><ul><li>if either of <i>A</i> and <i>B</i> is <i>double</i>, the result is <i>double</i>;</li>
  38 <li>else, if one of <i>A</i> and <i>B</i> is an integer type and the other is <i>float</i>, the result is <i>float</i>;</li>
  39 <li>else, if <i>A</i> or <i>B</i> is a signed integer and the other type is unsigned integer, the signed type is changed to unsigned, and then the lesser of the two integers is promoted to the other.</li>
  40 </ul></div>
  41 </div><div class="RenoAutoDIV"><div class="RenoHR"><hr/></div>
  42 See also: <span class="RenoPageList"><a href="boost_qvm_deduce_scalar_hpp.html">boost/qvm/deduce_scalar.hpp</a>&nbsp;| <a href="deduce_mat2.html">deduce_mat2</a>&nbsp;| <a href="deduce_quat2.html">deduce_quat2</a>&nbsp;| <a href="deduce_vec2.html">deduce_vec2</a>&nbsp;| <a href="dot_quat_quat_.html">dot(quat,quat)</a>&nbsp;| <a href="dot_vec_vec_.html">dot(vec,vec)</a></span>
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  44 <!-- Copyright (c) 2008-2016 Emil Dotchevski and Reverge Studios, Inc. -->
  45 <!-- Distributed under the Boost Software License, Version 1.0. (See accompanying -->
  46 <!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
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  51 <small>Copyright (c) 2008-2016 by Emil Dotchevski and Reverge Studios, Inc.<br/>
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