UnOperator.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: UnOperator.h,v 1.17 2007-06-23 15:59:00 opetzold Exp $
00022  */
00023 
00024 #ifndef TVMET_XPR_UNOPERATOR_H
00025 #define TVMET_XPR_UNOPERATOR_H
00026 
00027 namespace tvmet {
00028 
00029 
00030 /**
00031  * \class XprUnOp UnOperator.h "tvmet/xpr/UnOperator.h"
00032  * \brief Unary operator working on one subexpression.
00033  *
00034  * Using the access operator() the unary operation will be evaluated.
00035  */
00036 template<class UnOp, class E>
00037 class XprUnOp
00038   : public TvmetBase< XprUnOp<UnOp, E> >
00039 {
00040   XprUnOp();
00041   XprUnOp& operator=(const XprUnOp&);
00042 
00043 public:
00044   typedef typename UnOp::value_type                value_type;
00045 
00046 public:
00047   /** Complexity counter. */
00048   enum {
00049     ops_expr  = E::ops,
00050     ops       = 1 * ops_expr
00051   };
00052 
00053 public:
00054   /** Constructor for an expressions. */
00055   explicit XprUnOp(const E& e)
00056     : m_expr(e)
00057   { }
00058 
00059   /** Copy Constructor. Not explicit! */
00060 #if defined(TVMET_OPTIMIZE_XPR_MANUAL_CCTOR)
00061   XprUnOp(const XprUnOp& e)
00062     : m_expr(e.m_expr)
00063   { }
00064 #endif
00065 
00066   /** Index operator, evaluates the expression inside. */
00067   value_type operator()(std::size_t i) const {
00068     return UnOp::apply_on(m_expr(i));
00069   }
00070 
00071   /** index operator for arrays/matrices. */
00072   value_type operator()(std::size_t i, std::size_t j) const {
00073     return UnOp::apply_on(m_expr(i, j));
00074   }
00075 
00076 public: // debugging Xpr parse tree
00077   void print_xpr(std::ostream& os, std::size_t l=0) const {
00078     os << IndentLevel(l++)
00079        << "XprUnOp[O="<< ops << ", (O=" << ops_expr << ")]<"
00080        << std::endl;
00081     UnOp::print_xpr(os, l);
00082     m_expr.print_xpr(os, l);
00083     os << IndentLevel(--l)
00084        << ">," << std::endl;
00085   }
00086 
00087 private:
00088   const E                            m_expr;
00089 };
00090 
00091 
00092 } // namespace tvmet
00093 
00094 #endif // TVMET_XPR_UNOPERATOR_H
00095 
00096 // Local Variables:
00097 // mode:C++
00098 // tab-width:8
00099 // End: