MatrixCol.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: MatrixCol.h,v 1.19 2007-06-23 15:59:00 opetzold Exp $
00022  */
00023 
00024 #ifndef TVMET_XPR_MATRIX_COL_H
00025 #define TVMET_XPR_MATRIX_COL_H
00026 
00027 namespace tvmet {
00028 
00029 
00030 /**
00031  * \class XprMatrixCol MatrixCol.h "tvmet/xpr/MatrixCol.h"
00032  * \brief Expression on matrix used for access on the column vector.
00033  */
00034 template<class E, std::size_t Rows, std::size_t Cols>
00035 class XprMatrixCol
00036   : public TvmetBase< XprMatrixCol<E, Rows, Cols> >
00037 {
00038   XprMatrixCol();
00039   XprMatrixCol& operator=(const XprMatrixCol&);
00040 
00041 public:
00042   typedef typename E::value_type            value_type;
00043 
00044 public:
00045   /** Complexity counter. */
00046   enum {
00047     ops_expr  = E::ops,
00048     ops       = ops_expr/Cols    // equal Row accesses
00049   };
00050 
00051 public:
00052   /** Constructor. */
00053   explicit XprMatrixCol(const E& e, std::size_t no)
00054     : m_expr(e), m_col(no)
00055   {
00056     TVMET_RT_CONDITION(no < Cols, "XprMatrixCol Bounce Violation")
00057   }
00058 
00059   /** Copy Constructor. Not explicit! */
00060 #if defined(TVMET_OPTIMIZE_XPR_MANUAL_CCTOR)
00061   XprMatrixCol(const XprMatrixCol& e)
00062     : m_expr(e.m_expr), m_col(e.m_col)
00063   { }
00064 #endif
00065 
00066   value_type operator()(std::size_t i) const {
00067     TVMET_RT_CONDITION(i < Rows, "XprMatrixCol Bounce Violation")
00068     return m_expr(i, m_col);
00069   }
00070 
00071 public: // debugging Xpr parse tree
00072   void print_xpr(std::ostream& os, std::size_t l=0) const {
00073     os << IndentLevel(l++)
00074        << "XprMatrixCol[O=" << ops << ", (O=" << ops_expr << ")]<"
00075        << std::endl;
00076     m_expr.print_xpr(os, l);
00077     os << IndentLevel(l)
00078        << "R=" << Rows << ", C=" << Cols << std::endl
00079        << IndentLevel(--l) << ">"
00080        << ((l != 0) ? "," : "") << std::endl;
00081   }
00082 
00083 private:
00084   const E                        m_expr;
00085   const std::size_t                    m_col;
00086 };
00087 
00088 
00089 }
00090 
00091 #endif // TVMET_XPR_MATRIX_COL_H
00092 
00093 // Local Variables:
00094 // mode:C++
00095 // tab-width:8
00096 // End: