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<h1>QVM: Quaternions, Vectors, Matrices</h1>
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<!-- Copyright (c) 2008-2016 Emil Dotchevski and Reverge Studios, Inc. -->
<!-- Distributed under the Boost Software License, Version 1.0. (See accompanying -->
<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
<div class="RenoIncludeDIV"><div class="RenoAutoDIV"><h3>deduce_quat2</h3>
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<div class="RenoIncludeDIV"><p><span class="RenoEscape">#<!--<wiki>`#</wiki>--></span>include <<span class="RenoLink"><a href="boost_qvm_deduce_quat_hpp.html">boost/qvm/deduce_quat.hpp</a></span>></p>
<pre>namespace boost
{
namespace <span class="RenoLink"><a href="qvm.html">qvm</a></span>
{
<span class="RenoIncludeSPAN"> template <class A,class B>
struct <span class="RenoLink">deduce_quat2</span>
{
typedef /*unspecified*/ type;
};</span>
}
}</pre>
</div><h4>Assumptions:</h4>
<div><ul><li>Both <i><span class="RenoLink"><a href="scalar.html">scalar</a></span><A>::type</i> and <i><span class="RenoLink"><a href="scalar.html">scalar</a></span><B>::type</i> are well defined</li>
<li><i><span class="RenoLink"><a href="is_quat.html">is_quat</a></span><A>::value || <span class="RenoLink"><a href="is_quat.html">is_quat</a></span><B>::value</i> is <i>true</i></li>
</ul></div>
<h4>Requirements:</h4>
<div><ul><li><i><span class="RenoLink"><a href="is_quat.html">is_quat</a></span><<span class="RenoLink">deduce_quat2</span><A,B>::type>::value</i> must be <i>true</i></li>
<li><i><span class="RenoLink">deduce_quat2</span><A,B>::type</i> must be copyable</li>
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<p>This template is used by Boost QVM whenever it needs to deduce a quaternion type from the types of two user-supplied function parameters. The returned type must have accessible copy constructor (the <i>A</i> and <i>B</i> types themselves could be non-copyable, and either one of them may not be a quaternion type.)</p>
<p>The main template definition returns an unspecified quaternion type with <i><span class="RenoLink"><a href="mat_traits_M_scalar_type.html">scalar_type</a></span></i> obtained by <i><span class="RenoLink"><a href="deduce_scalar.html">deduce_scalar</a></span><A,B>::type</i>, except if <i>A</i> and <i>B</i> are the same quaternion type <i>Q</i>, in which case <i>Q</i> is returned, which is only suitable for copyable types. Boost QVM also defines (partial) specializations for the non-copyable quaternion types it produces. Users can define other (partial) specializations for their own types.</p>
<p>A typical use of the <i><span class="RenoLink">deduce_quat2</span></i> template is for specifying the preferred quaternion type to be returned by the generic function template overloads in Boost QVM depending on the type of their arguments.</p>
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See also: <span class="RenoPageList"><a href="boost_qvm_deduce_quat_hpp.html">boost/qvm/deduce_quat.hpp</a> | <a href="boost_qvm_quat_traits_array_hpp.html">boost/qvm/quat_traits_array.hpp</a> | <a href="operator_times_quat_quat_.html">operator*(quat,quat)</a> | <a href="operator_plus_quat_quat_.html">operator+(quat,quat)</a> | <a href="operator_minus_quat_quat_.html">operator-(quat,quat)</a> | <a href="slerp.html">slerp</a></span>
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