67 lines
4.0 KiB
HTML
67 lines
4.0 KiB
HTML
<!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.0 Strict//EN'
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<meta http-equiv='Content-Type' content='text/html; charset=utf-8'/>
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<title>accessing vector elements</title>
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<div class="body-0">
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<div class="body-1">
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<div class="body-2">
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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>Accessing Vector Elements</h3>
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</div>
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<div class="RenoIncludeDIV"><div class="RenoIncludeDIV"><p><span class="RenoEscape">#<!--<wiki>`#</wiki>--></span>include <<span class="RenoLink"><a href="boost_qvm_vec_access_hpp.html">boost/qvm/vec_access.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"> <span class="RenoIncludeSPAN">//Only <span class="RenoLink"><a href="SFINAE_enable_if.html">enabled if</a></span>:
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// <span class="RenoLink"><a href="is_vec.html">is_vec</a></span><V>::value
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template <int I,class V> -unspecified-return-type- <span class="RenoLink">A</span>( V & v );
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template <class V> -unspecified-return-type- A0( V & v );
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template <class V> -unspecified-return-type- A1( V & v );
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...
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template <class V> -unspecified-return-type- A9( V & v );
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template <class V> -unspecified-return-type- X( V & v );
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template <class V> -unspecified-return-type- Y( V & v );
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template <class V> -unspecified-return-type- Z( V & v );
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template <class V> -unspecified-return-type- W( V & v );</span></span>
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}
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}</pre>
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</div></div><p>An expression of the form of <i><span class="RenoLink">A</span><I>(v)</i> can be used to access the <i>I</i>-th element a vector object <i>v</i>. For example, the expression:</p>
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<pre><span class="RenoLink">A</span><1>(v) *= 42;</pre>
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<p>can be used to multiply the element at index 1 (indexing in Boost QVM is always zero-based) of a vector <i>v</i> by 42.</p>
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<p>For convenience, there are also non-template overloads for <i>I</i> from 0 to 9; an alternative way to write the above expression is:</p>
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<pre>A1(v) *= 42;</pre>
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<p><i>X</i>, <i>Y</i>, <i>Z</i> and <i>W</i> act the same as <i>A0</i>/<i>A1</i>/<i>A2</i>/<i>A3</i>; yet another alternative way to write the above expression is:</p>
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<pre>Y(v) *= 42;</pre>
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</div><div class="RenoAutoDIV"><div class="RenoHR"><hr/></div>
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See also: <span class="RenoPageList"><a href="index.html">Boost QVM</a> | <a href="boost_qvm_vec_access_hpp.html">boost/qvm/vec_access.hpp</a> | <a href="known_quirks_and_issues.html">Known Quirks and Issues</a> | <a href="Synopsis.html">Synopsis</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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</p>
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