1 <!DOCTYPE html PUBLIC '-//W3C//DTD XHTML
1.0 Strict//EN'
2 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd'
>
3 <html xmlns='http://www.w3.org/
1999/xhtml' xml:lang='en' lang='en'
>
5 <meta http-equiv='Content-Type' content='text/html; charset=utf-
8'
/>
6 <title>deduce_scalar
</title>
7 <link href='reno.css' type='text/css' rel='stylesheet'
/>
14 <h1>QVM: Quaternions, Vectors, Matrices
</h1>
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>
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>
24 namespace
<span class=
"RenoLink"><a href=
"qvm.html">qvm
</a></span>
26 <span class=
"RenoIncludeSPAN"> <span class=
"RenoIncludeSPAN">template
<class A,class B
>
27 struct
<span class=
"RenoLink">deduce_scalar
</span>
29 typedef typename impl
<A,B
>::type type;
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>
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>
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>
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) -->
49 <a class=
"logo" href=
"http://jigsaw.w3.org/css-validator/check/referer"><img class=
"logo_pic" src=
"valid-css.png" alt=
"Valid CSS" height=
"31" width=
"88"/></a>
50 <a class=
"logo" href=
"http://validator.w3.org/check?uri=referer"><img class=
"logo_pic" src=
"valid-xhtml.png" alt=
"Valid XHTML 1.0" height=
"31" width=
"88"/></a>
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>