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Sacado_CacheFad_Expression.hpp
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00001 // $Id$ 
00002 // $Source$ 
00003 // @HEADER
00004 // ***********************************************************************
00005 // 
00006 //                           Sacado Package
00007 //                 Copyright (2006) Sandia Corporation
00008 // 
00009 // Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
00010 // the U.S. Government retains certain rights in this software.
00011 // 
00012 // This library is free software; you can redistribute it and/or modify
00013 // it under the terms of the GNU Lesser General Public License as
00014 // published by the Free Software Foundation; either version 2.1 of the
00015 // License, or (at your option) any later version.
00016 //  
00017 // This library is distributed in the hope that it will be useful, but
00018 // WITHOUT ANY WARRANTY; without even the implied warranty of
00019 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00020 // Lesser General Public License for more details.
00021 //  
00022 // You should have received a copy of the GNU Lesser General Public
00023 // License along with this library; if not, write to the Free Software
00024 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
00025 // USA
00026 // Questions? Contact David M. Gay (dmgay@sandia.gov) or Eric T. Phipps
00027 // (etphipp@sandia.gov).
00028 // 
00029 // ***********************************************************************
00030 //
00031 // The forward-mode AD classes in Sacado are a derivative work of the
00032 // expression template classes in the Fad package by Nicolas Di Cesare.  
00033 // The following banner is included in the original Fad source code:
00034 //
00035 // ************ DO NOT REMOVE THIS BANNER ****************
00036 //
00037 //  Nicolas Di Cesare <Nicolas.Dicesare@ann.jussieu.fr>
00038 //  http://www.ann.jussieu.fr/~dicesare
00039 //
00040 //            CEMRACS 98 : C++ courses, 
00041 //         templates : new C++ techniques 
00042 //            for scientific computing 
00043 // 
00044 //********************************************************
00045 //
00046 //  A short implementation ( not all operators and 
00047 //  functions are overloaded ) of 1st order Automatic
00048 //  Differentiation in forward mode (FAD) using
00049 //  EXPRESSION TEMPLATES.
00050 //
00051 //********************************************************
00052 // @HEADER
00053 
00054 #ifndef SACADO_CACHEFAD_EXPRESSION_HPP
00055 #define SACADO_CACHEFAD_EXPRESSION_HPP
00056 
00057 #include "Sacado_Traits.hpp"
00058 
00059 namespace Sacado {
00060 
00061   namespace CacheFad {
00062 
00064 
00068     template <typename ExprT> 
00069     class Expr {};
00070 
00072 
00075     template <typename ConstT> 
00076     class ConstExpr {
00077 
00078     public:
00079 
00081       typedef ConstT value_type;
00082       
00084       typedef ConstT scalar_type;
00085 
00087       ConstExpr(const ConstT& constant) : constant_(constant) {}
00088 
00090       int size() const { return 0; }
00091       
00093       bool hasFastAccess() const { return 1; }
00094 
00096       value_type val() const { return constant_; }
00097 
00099       value_type dx(int i) const { return value_type(0); }
00100       
00102       value_type fastAccessDx(int i) const { return value_type(0); }
00103 
00104     protected:
00105       
00107       const ConstT& constant_;
00108 
00109     }; // class ConstExpr
00110 
00111   } // namespace CacheFad
00112 
00113 } // namespace Sacado
00114 
00115 #endif // SACADO_CACHEFAD_EXPRESSION_HPP
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