EvaluationDerivativeArcTan.hpp

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   Copyright (C) 2004, 2005, 2007 EPFL, Politecnico di Milano, INRIA
   Copyright (C) 2010 EPFL, Politecnico di Milano, Emory UNiversity

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/*!
 *   @file
     @brief This file contains the definition of the EvaluationAddition class.

     @date 06/2011
     @author Samuel Quinodoz <samuel.quinodoz@epfl.ch>
 */

#ifndef EVALUTATION_DERIVATIVEARCTAN_HPP
#define EVALUTATION_DERIVATIVEARCTAN_HPP

#include <lifev/core/LifeV.hpp>

#include <lifev/eta/array/OperationSmallDerivativeArcTan.hpp>
#include <lifev/eta/expression/ExpressionDerivativeArcTan.hpp>

#include <lifev/core/fem/QuadratureRule.hpp>

namespace LifeV
{

namespace ExpressionAssembly
{

//! Evaluation for the product of two other Evaluations
/*!
  @author Samuel Quinodoz <samuel.quinodoz@epfl.ch>

  This class aims at representing a product operation during the assembly

  This class is an Evaluation class, and therefore, has all the methods
  required to work within the Evaluation trees.
 */
template <typename EvaluationBaseType>
class EvaluationDerivativeArcTan
{
public:

    //! @name Public Types
    //@{
    typedef typename EvaluationBaseType::return_Type BaseReturn_Type;

    //! Type of the value returned by this class
    typedef typename OperationSmallArcTan<BaseReturn_Type>::result_Type return_Type;


    //@}


    //! @name Static constants
    //@{

    //! Flag for the global current FE
    const static flag_Type S_globalUpdateFlag;

    //! Flag for the test current FE
    const static flag_Type S_testUpdateFlag;

    //! Flag for the solution current FE
    const static flag_Type S_solutionUpdateFlag;

    //@}


    //! @name Constructors, destructor
    //@{

    //! Copy constructor
    EvaluationDerivativeArcTan (const EvaluationDerivativeArcTan& eval)
        : M_evaluationBase (eval.M_evaluationBase),
          M_epsilon (eval.M_epsilon),
          M_K (eval.M_K)
    {}

    //! Constructor from the corresponding expression
    template <typename BaseExpressionType>
    explicit EvaluationDerivativeArcTan (const ExpressionDerivativeArcTan<BaseExpressionType>& expression)
        : M_evaluationBase (expression.base() ),
          M_epsilon (expression.epsilon() ),
          M_K (expression.K() )
    {}

    //! Destructor
    ~EvaluationDerivativeArcTan() {}

    //@}


    //! @name Methods
    //@{

    //! Internal update method
    void update (const UInt& iElement)
    {
        M_evaluationBase.update (iElement);
    }

    //! Display method
    static void display ( std::ostream& out = std::cout )
    {
        out << " atan ( " ;
        EvaluationBaseType::display (out);
        out << ")";
    }

    //@}


    //! @name Set Methods
    //@{

    //! Setter for the global current FE
    template< typename CFEType >
    void setGlobalCFE (const CFEType* globalCFE)
    {
        M_evaluationBase.setGlobalCFE (globalCFE);
    }

    //! Setter for the test current FE
    template< typename CFEType >
    void setTestCFE (const CFEType* testCFE)
    {
        M_evaluationBase.setTestCFE (testCFE);
    }

    //! Setter for the solution current FE
    template< typename CFEType >
    void setSolutionCFE (const CFEType* solutionCFE)
    {
        M_evaluationBase.setSolutionCFE (solutionCFE);
    }

    //! Setter for the quadrature rule
    void setQuadrature (const QuadratureRule& qr)
    {
        M_evaluationBase.setQuadrature (qr);
    }

    //@}


    //! @name Get Methods
    //@{

    //! Getter a value
    return_Type value_q (const UInt& q) const
    {
        return ( M_epsilon * M_K ) * ( 1.0/ ( 1.0 + ( M_epsilon * M_epsilon * M_evaluationBase.value_q (q) * M_evaluationBase.value_q (q) ) ) );
    }

    //! Getter for the value for a vector
    return_Type value_qi (const UInt& q, const UInt& i) const
    {
        return ( M_epsilon * M_K ) * ( 1.0/ ( 1.0 + ( M_epsilon * M_epsilon * M_evaluationBase.value_qi (q, i) * M_evaluationBase.value_qi (q, i) ) ) );
    }

    //! Getter for the value for a matrix
    return_Type value_qij (const UInt& q, const UInt& i, const UInt& j) const
    {
        return ( M_epsilon * M_K ) * ( 1.0/ ( 1.0 + ( M_epsilon * M_epsilon * M_evaluationBase.value_qij (q, i, j) * M_evaluationBase.value_qij (q, i, j) ) ) );
    }

    //@}

private:

    //! @name Private Methods
    //@{

    //! No empty constructor
    EvaluationDerivativeArcTan();

    //@}

    //! Internal storage
    EvaluationBaseType M_evaluationBase;
    Real M_epsilon;
    Real M_K;
};

template< typename EvaluationBaseType>
const flag_Type EvaluationDerivativeArcTan<EvaluationBaseType>::S_globalUpdateFlag
    = EvaluationBaseType::S_globalUpdateFlag;

template< typename EvaluationBaseType>
const flag_Type EvaluationDerivativeArcTan<EvaluationBaseType>::S_testUpdateFlag
    = EvaluationBaseType::S_testUpdateFlag;

template< typename EvaluationBaseType>
const flag_Type EvaluationDerivativeArcTan<EvaluationBaseType>::S_solutionUpdateFlag
    = EvaluationBaseType::S_solutionUpdateFlag;

} // Namespace ExpressionAssembly

} // Namespace LifeV
#endif