64 lines
5.1 KiB
HTML
64 lines
5.1 KiB
HTML
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<title>deduce_vec2</title>
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<div>
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<h1>QVM: Quaternions, Vectors, Matrices</h1>
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</div>
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<!-- Copyright (c) 2008-2016 Emil Dotchevski and Reverge Studios, Inc. -->
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<!-- Distributed under the Boost Software License, Version 1.0. (See accompanying -->
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<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
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<div class="RenoIncludeDIV"><div class="RenoAutoDIV"><h3>deduce_vec2</h3>
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</div>
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<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>
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<pre>namespace boost
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{
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namespace <span class="RenoLink"><a href="qvm.html">qvm</a></span>
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{
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<span class="RenoIncludeSPAN"> template <class A,class B,int Dim>
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struct <span class="RenoLink">deduce_vec2</span>
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{
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typedef /*unspecified*/ type;
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};</span>
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}
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}</pre>
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</div><h4>Assumptions:</h4>
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<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>
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<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>
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</ul></div>
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<h4>Requirements:</h4>
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<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>
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<li><i><span class="RenoLink">deduce_vec2</span><A,B>::type</i> must be copyable</li>
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<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>
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</ul></div>
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<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>
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<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>
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<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>
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</div><div class="RenoAutoDIV"><div class="RenoHR"><hr/></div>
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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>
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</div>
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<!-- Copyright (c) 2008-2016 Emil Dotchevski and Reverge Studios, Inc. -->
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<!-- Distributed under the Boost Software License, Version 1.0. (See accompanying -->
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<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
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<small>Copyright (c) 2008-2016 by Emil Dotchevski and Reverge Studios, Inc.<br/>
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Distributed under the <a href="http://www.boost.org/LICENSE_1_0.txt">Boost Software License, Version 1.0</a>.</small>
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