Gemm.h

00001 /*
00002  * Tiny Vector Matrix Library
00003  * Dense Vector Matrix Libary of Tiny size using Expression Templates
00004  *
00005  * Copyright (C) 2001 - 2007 Olaf Petzold <opetzold@users.sourceforge.net>
00006  *
00007  * This library is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * This library is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with this library; if not, write to the Free Software
00019  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00020  *
00021  * $Id: Gemm.h,v 1.15 2007-06-23 15:58:59 opetzold Exp $
00022  */
00023 
00024 #ifndef TVMET_META_GEMM_H
00025 #define TVMET_META_GEMM_H
00026 
00027 #include <tvmet/xpr/Null.h>
00028 
00029 namespace tvmet {
00030 
00031 namespace meta {
00032 
00033 
00034 /**
00035  * \class gemm Gemm.h "tvmet/meta/Gemm.h"
00036  * \brief Meta class for matrix-matrix operations, like product
00037  *        using formula
00038  *        \f[
00039  *        M_1\,M_2
00040  *        \f]
00041  * \note The rows of matrix 2 have to be equal to cols of matrix 1.
00042  */
00043 template<std::size_t Rows1, std::size_t Cols1,
00044      std::size_t Cols2,
00045      std::size_t K>
00046 class gemm
00047 {
00048   gemm();
00049   gemm(const gemm&);
00050   gemm& operator=(const gemm&);
00051 
00052 private:
00053   enum {
00054     doIt = (K != Cols1 - 1)         /**< recursive counter */
00055   };
00056 
00057 public:
00058   template<class E1, class E2>
00059   static inline
00060   typename PromoteTraits<
00061     typename E1::value_type,
00062     typename E2::value_type
00063   >::value_type
00064   prod(const E1& lhs, const E2& rhs, std::size_t i, std::size_t j) {
00065     return lhs(i, K) * rhs(K, j)
00066       + gemm<Rows1 * doIt, Cols1 * doIt,
00067              Cols2 * doIt,
00068              (K+1) * doIt>::prod(lhs, rhs, i, j);
00069   }
00070 };
00071 
00072 
00073 /**
00074  * \class gemm<0,0,0,0> Gemm.h "tvmet/meta/Gemm.h"
00075  * \brief gemm Specialized for recursion.
00076  */
00077 template<>
00078 class gemm<0,0,0,0>
00079 {
00080   gemm();
00081   gemm(const gemm&);
00082   gemm& operator=(const gemm&);
00083 
00084 public:
00085   template<class E1, class E2>
00086   static inline
00087   XprNull prod(const E1&, const E2&, std::size_t, std::size_t) {
00088     return XprNull();
00089   }
00090 };
00091 
00092 
00093 } // namespace meta
00094 
00095 } // namespace tvmet
00096 
00097 #endif /* TVMET_META_GEMM_H */
00098 
00099 // Local Variables:
00100 // mode:C++
00101 // tab-width:8
00102 // End: