blitz Version 0.10
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00001 // -*- C++ -*- 00002 /*************************************************************************** 00003 * blitz/tvcross.h Cross product of TinyVector<N,3>'s 00004 * 00005 * $Id: tvcross.h,v 1.5 2011/03/25 22:41:16 julianc Exp $ 00006 * 00007 * Copyright (C) 1997-2011 Todd Veldhuizen <tveldhui@acm.org> 00008 * 00009 * This file is a part of Blitz. 00010 * 00011 * Blitz is free software: you can redistribute it and/or modify 00012 * it under the terms of the GNU Lesser General Public License 00013 * as published by the Free Software Foundation, either version 3 00014 * of the License, or (at your option) any later version. 00015 * 00016 * Blitz is distributed in the hope that it will be useful, 00017 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00018 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00019 * GNU Lesser General Public License for more details. 00020 * 00021 * You should have received a copy of the GNU Lesser General Public 00022 * License along with Blitz. If not, see <http://www.gnu.org/licenses/>. 00023 * 00024 * Suggestions: blitz-devel@lists.sourceforge.net 00025 * Bugs: blitz-support@lists.sourceforge.net 00026 * 00027 * For more information, please see the Blitz++ Home Page: 00028 * https://sourceforge.net/projects/blitz/ 00029 * 00030 ***************************************************************************/ 00031 00032 #ifndef BZ_TVCROSS_H 00033 #define BZ_TVCROSS_H 00034 00035 #ifndef BZ_TINYVEC_H 00036 #error <blitz/tvcross.h> must be included via <blitz/tinyvec.h> 00037 #endif 00038 00039 BZ_NAMESPACE(blitz) 00040 00041 /* 00042 * cross product. 00043 * 00044 * NEEDS_WORK: - cross product of two different vector types 00045 * - cross product involving expressions 00046 */ 00047 00048 template<typename T_numtype> 00049 TinyVector<T_numtype,3> cross(const TinyVector<T_numtype,3>& x, 00050 const TinyVector<T_numtype,3>& y) 00051 { 00052 return TinyVector<T_numtype,3>(x[1]*y[2] - y[1]*x[2], 00053 y[0]*x[2] - x[0]*y[2], x[0]*y[1] - y[0]*x[1]); 00054 } 00055 00056 00057 BZ_NAMESPACE_END 00058 00059 #endif // BZ_TVCROSS_H