blitz/tvcross.h

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00001 /***************************************************************************
00002  * blitz/tvcross.h      Cross product of TinyVector<N,3>'s
00003  *
00004  * $Id: tvcross.h,v 1.4 2003/12/11 03:44:22 julianc Exp $
00005  *
00006  * Copyright (C) 1997-2001 Todd Veldhuizen <tveldhui@oonumerics.org>
00007  *
00008  * This program is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU General Public License
00010  * as published by the Free Software Foundation; either version 2
00011  * of the License, or (at your option) any later version.
00012  *
00013  * This program is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00016  * GNU General Public License for more details.
00017  *
00018  * Suggestions:          blitz-dev@oonumerics.org
00019  * Bugs:                 blitz-bugs@oonumerics.org
00020  *
00021  * For more information, please see the Blitz++ Home Page:
00022  *    http://oonumerics.org/blitz/
00023  *
00024  ***************************************************************************/
00025 
00026 #ifndef BZ_TVCROSS_H
00027 #define BZ_TVCROSS_H
00028 
00029 #ifndef BZ_TINYVEC_H
00030  #error <blitz/tvcross.h> must be included via <blitz/tinyvec.h>
00031 #endif
00032 
00033 BZ_NAMESPACE(blitz)
00034 
00035 /*
00036  * cross product.
00037  *
00038  * NEEDS_WORK: - cross product of two different vector types
00039  *             - cross product involving expressions
00040  */
00041 
00042 template<typename T_numtype>
00043 TinyVector<T_numtype,3> cross(const TinyVector<T_numtype,3>& x, 
00044     const TinyVector<T_numtype,3>& y)
00045 {
00046     return TinyVector<T_numtype,3>(x[1]*y[2] - y[1]*x[2],
00047         y[0]*x[2] - x[0]*y[2], x[0]*y[1] - y[0]*x[1]);
00048 }
00049 
00050 
00051 BZ_NAMESPACE_END
00052 
00053 #endif // BZ_TVCROSS_H

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