| 1 | // -*- C++ -*- |
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| 2 | /*************************************************************************** |
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| 3 | * blitz/tvcross.h Cross product of TinyVector<N,3>'s |
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| 4 | * |
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| 5 | * $Id$ |
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| 6 | * |
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| 7 | * Copyright (C) 1997-2011 Todd Veldhuizen <tveldhui@acm.org> |
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| 8 | * |
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| 9 | * This file is a part of Blitz. |
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| 10 | * |
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| 11 | * Blitz is free software: you can redistribute it and/or modify |
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| 12 | * it under the terms of the GNU Lesser General Public License |
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| 13 | * as published by the Free Software Foundation, either version 3 |
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| 14 | * of the License, or (at your option) any later version. |
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| 15 | * |
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| 16 | * Blitz is distributed in the hope that it will be useful, |
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| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 19 | * GNU Lesser General Public License for more details. |
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| 20 | * |
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| 21 | * You should have received a copy of the GNU Lesser General Public |
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| 22 | * License along with Blitz. If not, see <http://www.gnu.org/licenses/>. |
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| 23 | * |
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| 24 | * Suggestions: blitz-devel@lists.sourceforge.net |
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| 25 | * Bugs: blitz-support@lists.sourceforge.net |
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| 26 | * |
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| 27 | * For more information, please see the Blitz++ Home Page: |
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| 28 | * https://sourceforge.net/projects/blitz/ |
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| 29 | * |
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| 30 | ***************************************************************************/ |
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| 31 | |
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| 32 | #ifndef BZ_TVCROSS_H |
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| 33 | #define BZ_TVCROSS_H |
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| 34 | |
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| 35 | #ifndef BZ_TINYVEC_H |
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| 36 | #error <blitz/tvcross.h> must be included via <blitz/tinyvec.h> |
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| 37 | #endif |
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| 38 | |
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| 39 | BZ_NAMESPACE(blitz) |
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| 40 | |
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| 41 | /* |
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| 42 | * cross product. |
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| 43 | * |
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| 44 | * NEEDS_WORK: - cross product of two different vector types |
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| 45 | * - cross product involving expressions |
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| 46 | */ |
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| 47 | |
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| 48 | template<typename T_numtype> |
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| 49 | TinyVector<T_numtype,3> cross(const TinyVector<T_numtype,3>& x, |
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| 50 | const TinyVector<T_numtype,3>& y) |
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| 51 | { |
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| 52 | return TinyVector<T_numtype,3>(x[1]*y[2] - y[1]*x[2], |
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| 53 | y[0]*x[2] - x[0]*y[2], x[0]*y[1] - y[0]*x[1]); |
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| 54 | } |
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| 55 | |
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| 56 | |
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| 57 | BZ_NAMESPACE_END |
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| 58 | |
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| 59 | #endif // BZ_TVCROSS_H |
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