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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_vec2
</h3>
21 <div class=
"RenoIncludeDIV"><p><span class=
"RenoEscape">#<!--<wiki>`#</wiki>--></span>include
<<span class=
"RenoLink"><a href=
"boost_qvm_deduce_vec_hpp.html">boost/qvm/deduce_vec.hpp
</a></span>></p>
24 namespace
<span class=
"RenoLink"><a href=
"qvm.html">qvm
</a></span>
26 <span class=
"RenoIncludeSPAN"> template
<class A,class B,int Dim
>
27 struct
<span class=
"RenoLink">deduce_vec2
</span>
29 typedef /*unspecified*/ type;
33 </div><h4>Assumptions:
</h4>
34 <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>
35 <li><i><span class=
"RenoLink"><a href=
"is_vec.html">is_vec
</a></span><A
>::value ||
<span class=
"RenoLink"><a href=
"is_vec.html">is_vec
</a></span><B
>::value
</i> is
<i>true
</i></li>
37 <h4>Requirements:
</h4>
38 <div><ul><li><i><span class=
"RenoLink"><a href=
"is_vec.html">is_vec
</a></span><<span class=
"RenoLink">deduce_vec2
</span><A,B
>::type
>::value
</i> must be
<i>true
</i></li>
39 <li><i><span class=
"RenoLink">deduce_vec2
</span><A,B
>::type
</i> must be copyable
</li>
40 <li><i><span class=
"RenoLink"><a href=
"vec_traits.html">vec_traits
</a></span><<span class=
"RenoLink">deduce_vec2
</span><A,B
>::type
>::
<span class=
"RenoLink"><a href=
"vec_traits_Vector_dim.html">dim
</a></span>==Dim
</i></li>
42 <p>This template is used by Boost QVM whenever it needs to deduce a vector type of certain dimension 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 vector type.)
</p>
43 <p>The main template definition returns an unspecified vector type of the requested dimension 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 vector type
<i>V
</i> of dimension
<i>Dim
</i>, in which case V is returned, which is only suitable for copyable types. Boost QVM also defines (partial) specializations for the non-copyable vector types it produces. Users can define other (partial) specializations for their own types.
</p>
44 <p>A typical use of the
<i><span class=
"RenoLink">deduce_vec2
</span></i> template is for specifying the preferred vector type to be returned by the generic function template overloads in Boost QVM depending on the type of their arguments.
</p>
45 </div><div class=
"RenoAutoDIV"><div class=
"RenoHR"><hr/></div>
46 See also:
<span class=
"RenoPageList"><a href=
"boost_qvm_deduce_vec_hpp.html">boost/qvm/deduce_vec.hpp
</a> |
<a href=
"boost_qvm_vec_traits_array_hpp.html">boost/qvm/vec_traits_array.hpp
</a> |
<a href=
"cross.html">cross
</a> |
<a href=
"operator_times_mat_vec_.html">operator*(mat,vec)
</a> |
<a href=
"operator_times_quat_vec_.html">operator*(quat,vec)
</a> |
<a href=
"operator_times_vec_mat_.html">operator*(vec,mat)
</a> |
<a href=
"operator_plus_vec_vec_.html">operator+(vec,vec)
</a> |
<a href=
"operator_minus_vec_vec_.html">operator-(vec,vec)
</a> |
<a href=
"transform_point.html">transform_point
</a> |
<a href=
"transform_vector.html">transform_vector
</a></span>
48 <!-- Copyright (c) 2008-2016 Emil Dotchevski and Reverge Studios, Inc. -->
49 <!-- Distributed under the Boost Software License, Version 1.0. (See accompanying -->
50 <!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
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55 <small>Copyright (c)
2008-
2016 by Emil Dotchevski and Reverge Studios, Inc.
<br/>
56 Distributed under the
<a href=
"http://www.boost.org/LICENSE_1_0.txt">Boost Software License, Version
1.0</a>.
</small>