Sacado_Fad_GeneralFad.hpp

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// $Id: Sacado_Fad_GeneralFad.hpp,v 1.12 2007/11/14 00:18:18 etphipp Exp $ 
// $Source: /space/CVS/Trilinos/packages/sacado/src/Sacado_Fad_GeneralFad.hpp,v $ 
// @HEADER
// ***********************************************************************
// 
//                           Sacado Package
//                 Copyright (2006) Sandia Corporation
// 
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
// the U.S. Government retains certain rights in this software.
// 
// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 2.1 of the
// License, or (at your option) any later version.
//  
// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//  
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA
// Questions? Contact David M. Gay (dmgay@sandia.gov) or Eric T. Phipps
// (etphipp@sandia.gov).
// 
// ***********************************************************************
//
// The forward-mode AD classes in Sacado are a derivative work of the
// expression template classes in the Fad package by Nicolas Di Cesare.  
// The following banner is included in the original Fad source code:
//
// ************ DO NOT REMOVE THIS BANNER ****************
//
//  Nicolas Di Cesare <Nicolas.Dicesare@ann.jussieu.fr>
//  http://www.ann.jussieu.fr/~dicesare
//
//            CEMRACS 98 : C++ courses, 
//         templates : new C++ techniques 
//            for scientific computing 
// 
//********************************************************
//
//  A short implementation ( not all operators and 
//  functions are overloaded ) of 1st order Automatic
//  Differentiation in forward mode (FAD) using
//  EXPRESSION TEMPLATES.
//
//********************************************************
// @HEADER

#ifndef SACADO_FAD_GENERALFAD_HPP
#define SACADO_FAD_GENERALFAD_HPP

#include "Sacado_Fad_Expression.hpp"

namespace Sacado {

  namespace Fad {


    template <typename T, typename Storage> 
    class GeneralFad {

    public:

      typedef T value_type;


      GeneralFad() : s_(T(0.)) {}


      GeneralFad(const T & x) : s_(x) {}


      GeneralFad(const int sz, const T & x) : s_(sz, x) {}


      GeneralFad(const int sz, const int i, const T & x) : 
  s_(sz, x) { 
  s_.dx_[i]=1.; 
      }

      GeneralFad(const GeneralFad& x) : 
  s_(x.s_) {}

      template <typename S> GeneralFad(const Expr<S>& x);

      ~GeneralFad() {}


      void diff(const int ith, const int n);


      void resize(int sz) { s_.resize(sz); }

      void zero() { s_.zero(); }



      const T& val() const { return s_.val_;}

      T& val() { return s_.val_;}



      int size() const { return s_.size();}

      bool hasFastAccess() const { return s_.size()!=0;}

      bool isPassive() const { return s_.size()!=0;}
      
      void setIsConstant(bool is_const) { 
  if (is_const && s_.size()!=0)
    s_.resize(0);
      }

      const T* dx() const { return &(s_.dx_[0]);}

      T dx(int i) const { 
  return s_.size() ? s_.dx_[i] : T(0.); }
    
      T& fastAccessDx(int i) { return s_.dx_[i];}

      const T& fastAccessDx(int i) const { return s_.dx_[i];}
    


      GeneralFad& operator=(const T& val);

      GeneralFad& 
      operator=(const GeneralFad& x);

      template <typename S> 
      GeneralFad& operator=(const Expr<S>& x); 



      GeneralFad& operator += (const T& x);

      GeneralFad& operator -= (const T& x);

      GeneralFad& operator *= (const T& x);

      GeneralFad& operator /= (const T& x);

      template <typename S> 
      GeneralFad& operator += (const Expr<S>& x);

      template <typename S> 
      GeneralFad& operator -= (const Expr<S>& x);
  
      template <typename S> 
      GeneralFad& operator *= (const Expr<S>& x);

      template <typename S> 
      GeneralFad& operator /= (const Expr<S>& x);


    protected:

      Storage s_;

    }; // class GeneralFad

  } // namespace Fad

} // namespace Sacado

#include "Sacado_Fad_GeneralFadImp.hpp"

#endif // SACADO_FAD_GENERALFAD_HPP

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