Sacado_Tay_CacheTaylorExpr.hpp

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// $Id: Sacado_Tay_CacheTaylorExpr.hpp,v 1.1 2007/06/29 22:18:33 etphipp Exp $ 
// $Source: /space/CVS/Trilinos/packages/sacado/src/Sacado_Tay_CacheTaylorExpr.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).
// 
// ***********************************************************************
// @HEADER

#ifndef SACADO_TAY_CACHETAYLOREXPR_HPP
#define SACADO_TAY_CACHETAYLOREXPR_HPP

#include "Sacado_Traits.hpp"

namespace Sacado {

  namespace Tay {


    template <typename ExprT> 
    class Expr {

    public:

      typedef typename ExprT::value_type value_type;

      explicit Expr(const ExprT& expr) : expr_(expr) {}

      void allocateCache(unsigned int d) const { expr_.allocateCache(d); }

      unsigned int degree() const {return expr_.degree();}
      
      bool hasFastAccess(unsigned int d) const { 
  return expr_.hasFastAccess(d);}

      value_type coeff(unsigned int i) const { return expr_.coeff(i);}

      value_type fastAccessCoeff(unsigned int i) const { return 
    expr_.fastAccessCoeff(i);}
      
    protected:

      Expr() {}

      ExprT expr_;

    }; // class Expr


    template <typename ConstT> 
    class ConstExpr {

    public:

      typedef ConstT value_type;

      ConstExpr(const ConstT& constant) : constant_(constant) {}

      void allocateCache(unsigned int d) const {}

      unsigned int degree() const { return 0; }
      
      bool hasFastAccess(unsigned int d) const { return 1; }

      value_type value() const { return constant_; }

      value_type coeff(unsigned int i) const { 
  return i==0 ? constant_ : value_type(0); }
      
      value_type fastAccessCoeff(unsigned int i) const { 
  return i==0 ? constant_ : value_type(0); }

    protected:
      
      ConstT constant_;

    }; // class ConstExpr


    template <typename ExprT, template<typename> class Op> 
    class UnaryExpr {

    public:

      typedef typename ExprT::value_type value_type;

      UnaryExpr(const ExprT& expr) : expr_(expr), op_(expr) {}

      void allocateCache(unsigned int d) const { 
  expr_.allocateCache(d); 
  op_.allocateCache(d);
      }

      unsigned int degree() const {return expr_.degree();}
      
      bool hasFastAccess(unsigned int d) const { 
  return expr_.hasFastAccess(d); }

      value_type coeff(unsigned int i) const { 
  return op_.computeCoeff(i,expr_); }
      
      value_type fastAccessCoeff(unsigned int i) const { 
  return op_.computeFastAccessCoeff(i,expr_); 
      }

    protected:
      
      ExprT expr_;

      Op<ExprT> op_;

    }; // class UnaryExpr


    template <typename ExprT1, typename ExprT2, 
        template<typename,typename> class Op> 
    class BinaryExpr {
    
    public:

      typedef typename ExprT1::value_type value_type_1;

      typedef typename ExprT2::value_type value_type_2;

      typedef typename Sacado::Promote<value_type_1,
               value_type_2>::type value_type;

      BinaryExpr(const ExprT1& expr1, const ExprT2& expr2) : 
  expr1_(expr1), expr2_(expr2), op_(expr1,expr2) {}

      void allocateCache(unsigned int d) const { 
  expr1_.allocateCache(d); 
  expr2_.allocateCache(d); 
  op_.allocateCache(d);
      }

      unsigned int degree() const {
  unsigned int d1 = expr1_.degree(), d2 = expr2_.degree(); 
  return d1 > d2 ? d1 : d2;
      }
      
      bool hasFastAccess(unsigned int d) const { 
  return expr1_.hasFastAccess(d) && expr2_.hasFastAccess(d);}

      value_type coeff(unsigned int i) const { 
  return op_.computeCoeff(i,expr1_,expr2_); }
      
      value_type fastAccessCoeff(unsigned int i) const { 
  return op_.computeFastAccessCoeff(i,expr1_,expr2_); 
      }

    protected:
      
      ExprT1 expr1_;

      ExprT2 expr2_;

      Op<ExprT1,ExprT2> op_;

    }; // class BinaryExpr


    template <typename ExprT2, template<typename,typename> class Op> 
    class BinaryExpr<ConstExpr<typename ExprT2::value_type>, ExprT2, Op> {
    
    public:

      typedef ConstExpr<typename ExprT2::value_type> ExprT1;

      typedef typename ExprT2::value_type value_type;

      BinaryExpr(const ExprT1& expr1, const ExprT2& expr2) : 
  expr1_(expr1), expr2_(expr2), op_(expr1,expr2) {}

      void allocateCache(unsigned int d) const { 
  expr2_.allocateCache(d); 
  op_.allocateCache(d);
      }

      unsigned int degree() const {
  return expr2_.degree(); 
      }
      
      bool hasFastAccess(unsigned int d) const { 
  return expr2_.hasFastAccess(d);}

      value_type coeff(unsigned int i) const { 
  return op_.computeCoeff(i,expr1_,expr2_); }
      
      value_type fastAccessCoeff(unsigned int i) const { 
  return op_.computeFastAccessCoeff(i,expr1_,expr2_); 
      }

    protected:
      
      ExprT1 expr1_;

      ExprT2 expr2_;

      Op<ExprT1,ExprT2> op_;

    }; // class BinaryExpr


    template <typename ExprT1, template<typename,typename> class Op> 
    class BinaryExpr<ExprT1,ConstExpr<typename ExprT1::value_type>, Op> {
    
    public:

      typedef ConstExpr<typename ExprT1::value_type> ExprT2;

      typedef typename ExprT1::value_type value_type;

      BinaryExpr(const ExprT1& expr1, const ExprT2& expr2) : 
  expr1_(expr1), expr2_(expr2), op_(expr1,expr2) {}

      void allocateCache(unsigned int d) const { 
  expr1_.allocateCache(d); 
  op_.allocateCache(d);
      }

      unsigned int degree() const {
  return expr1_.degree(); 
      }
      
      bool hasFastAccess(unsigned int d) const { 
  return expr1_.hasFastAccess(d);}

      value_type coeff(unsigned int i) const { 
  return op_.computeCoeff(i,expr1_,expr2_); }
      
      value_type fastAccessCoeff(unsigned int i) const { 
  return op_.computeFastAccessCoeff(i,expr1_,expr2_); 
      }

    protected:
      
      ExprT1 expr1_;

      ExprT2 expr2_;

      Op<ExprT1,ExprT2> op_;

    }; // class BinaryExpr

  } // namespace Tay

} // namespace Sacado

#endif // SACADO_TAY_CACHETAYLOREXPR_HPP

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