1 | /*************************************************************************** |
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2 | * blitz/tvcross.h Cross product of TinyVector<N,3>'s |
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3 | * |
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4 | * $Id: tvcross.h,v 1.4 2003/12/11 03:44:22 julianc Exp $ |
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5 | * |
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6 | * Copyright (C) 1997-2001 Todd Veldhuizen <tveldhui@oonumerics.org> |
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7 | * |
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8 | * This program is free software; you can redistribute it and/or |
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9 | * modify it under the terms of the GNU General Public License |
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10 | * as published by the Free Software Foundation; either version 2 |
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11 | * of the License, or (at your option) any later version. |
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12 | * |
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13 | * This program is distributed in the hope that it will be useful, |
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 | * GNU General Public License for more details. |
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17 | * |
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18 | * Suggestions: blitz-dev@oonumerics.org |
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19 | * Bugs: blitz-bugs@oonumerics.org |
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20 | * |
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21 | * For more information, please see the Blitz++ Home Page: |
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22 | * http://oonumerics.org/blitz/ |
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23 | * |
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24 | ***************************************************************************/ |
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25 | |
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26 | #ifndef BZ_TVCROSS_H |
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27 | #define BZ_TVCROSS_H |
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28 | |
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29 | #ifndef BZ_TINYVEC_H |
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30 | #error <blitz/tvcross.h> must be included via <blitz/tinyvec.h> |
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31 | #endif |
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32 | |
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33 | BZ_NAMESPACE(blitz) |
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34 | |
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35 | /* |
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36 | * cross product. |
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37 | * |
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38 | * NEEDS_WORK: - cross product of two different vector types |
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39 | * - cross product involving expressions |
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40 | */ |
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41 | |
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42 | template<typename T_numtype> |
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43 | TinyVector<T_numtype,3> cross(const TinyVector<T_numtype,3>& x, |
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44 | const TinyVector<T_numtype,3>& y) |
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45 | { |
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46 | return TinyVector<T_numtype,3>(x[1]*y[2] - y[1]*x[2], |
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47 | y[0]*x[2] - x[0]*y[2], x[0]*y[1] - y[0]*x[1]); |
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48 | } |
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49 | |
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50 | |
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51 | BZ_NAMESPACE_END |
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52 | |
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53 | #endif // BZ_TVCROSS_H |
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