projects / ceph.git / blame
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| 7c673cae FG |
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| 4 | <head> | |
| 5 | <meta http-equiv='Content-Type' content='text/html; charset=utf-8'/> | |
| 6 | <title>deduce_scalar</title> | |
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| 8 | </head> | |
| 9 | <body> | |
| 10 | <div class="body-0"> | |
| 11 | <div class="body-1"> | |
| 12 | <div class="body-2"> | |
| 13 | <div> | |
| 14 | <h1>QVM: Quaternions, Vectors, Matrices</h1> | |
| 15 | </div> | |
| 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> | |
| 20 | </div> | |
| 21 | <div class="RenoIncludeDIV"><div class="RenoIncludeDIV"><p><span class="RenoEscape">#<!--<wiki>`#</wiki>--></span>include <<span class="RenoLink"><a href="boost_qvm_deduce_scalar_hpp.html">boost/qvm/deduce_scalar.hpp</a></span>></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 <class A,class B> | |
| 27 | struct <span class="RenoLink">deduce_scalar</span> | |
| 28 | { | |
| 29 | typedef typename impl<A,B>::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<A,B>::type</i> returns that type. Otherwise, <i>impl<A,B>::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> | <a href="deduce_mat2.html">deduce_mat2</a> | <a href="deduce_quat2.html">deduce_quat2</a> | <a href="deduce_vec2.html">deduce_vec2</a> | <a href="dot_quat_quat_.html">dot(quat,quat)</a> | <a href="dot_vec_vec_.html">dot(vec,vec)</a></span> | |
| 43 | </div> | |
| 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/> | |
| 52 | Distributed under the <a href="http://www.boost.org/LICENSE_1_0.txt">Boost Software License, Version 1.0</a>.</small> | |
| 53 | </p> | |
| 54 | </div> | |
| 55 | </div> | |
| 56 | </div> | |
| 57 | </div> | |
| 58 | </body> | |
| 59 | </html> |