projects / ceph.git / blame
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| 7c673cae FG |
1 | <!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.0 Strict//EN' |
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| 4 | <head> | |
| 5 | <meta http-equiv='Content-Type' content='text/html; charset=utf-8'/> | |
| 6 | <title>accessing vector elements</title> | |
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| 8 | </head> | |
| 9 | <body> | |
| 10 | <div class="body-0"> | |
| 11 | <div class="body-1"> | |
| 12 | <div class="body-2"> | |
| 13 | <div> | |
| 14 | <h1>QVM: Quaternions, Vectors, Matrices</h1> | |
| 15 | </div> | |
| 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>Accessing Vector Elements</h3> | |
| 20 | </div> | |
| 21 | <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> | |
| 22 | <pre>namespace boost | |
| 23 | { | |
| 24 | namespace <span class="RenoLink"><a href="qvm.html">qvm</a></span> | |
| 25 | { | |
| 26 | <span class="RenoIncludeSPAN"> <span class="RenoIncludeSPAN">//Only <span class="RenoLink"><a href="SFINAE_enable_if.html">enabled if</a></span>: | |
| 27 | // <span class="RenoLink"><a href="is_vec.html">is_vec</a></span><V>::value | |
| 28 | ||
| 29 | template <int I,class V> -unspecified-return-type- <span class="RenoLink">A</span>( V & v ); | |
| 30 | template <class V> -unspecified-return-type- A0( V & v ); | |
| 31 | template <class V> -unspecified-return-type- A1( V & v ); | |
| 32 | ... | |
| 33 | template <class V> -unspecified-return-type- A9( V & v ); | |
| 34 | ||
| 35 | template <class V> -unspecified-return-type- X( V & v ); | |
| 36 | template <class V> -unspecified-return-type- Y( V & v ); | |
| 37 | template <class V> -unspecified-return-type- Z( V & v ); | |
| 38 | template <class V> -unspecified-return-type- W( V & v );</span></span> | |
| 39 | } | |
| 40 | }</pre> | |
| 41 | </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> | |
| 42 | <pre><span class="RenoLink">A</span><1>(v) *= 42;</pre> | |
| 43 | <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> | |
| 44 | <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> | |
| 45 | <pre>A1(v) *= 42;</pre> | |
| 46 | <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> | |
| 47 | <pre>Y(v) *= 42;</pre> | |
| 48 | </div><div class="RenoAutoDIV"><div class="RenoHR"><hr/></div> | |
| 49 | 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> | |
| 50 | </div> | |
| 51 | <!-- Copyright (c) 2008-2016 Emil Dotchevski and Reverge Studios, Inc. --> | |
| 52 | <!-- Distributed under the Boost Software License, Version 1.0. (See accompanying --> | |
| 53 | <!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) --> | |
| 54 | <div id="footer"> | |
| 55 | <p> | |
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| 58 | <small>Copyright (c) 2008-2016 by Emil Dotchevski and Reverge Studios, Inc.<br/> | |
| 59 | Distributed under the <a href="http://www.boost.org/LICENSE_1_0.txt">Boost Software License, Version 1.0</a>.</small> | |
| 60 | </p> | |
| 61 | </div> | |
| 62 | </div> | |
| 63 | </div> | |
| 64 | </div> | |
| 65 | </body> | |
| 66 | </html> |