ExpressionPower.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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//@HEADER

/*!
    @file
    @brief File where the structures for the product between expressions are defined.

    @author Samuel Quinodoz <samuel.quinodoz@epfl.ch>

    @date 07-2011
 */

#ifndef EXPRESSION_POWER_HPP
#define EXPRESSION_POWER_HPP

#include <lifev/core/LifeV.hpp>

#include <lifev/eta/expression/ExpressionBase.hpp>
#include <lifev/eta/expression/ExpressionDeterminant.hpp>
#include <lifev/eta/expression/ExpressionTrace.hpp>

namespace LifeV
{

namespace ExpressionAssembly
{

//! class ExpressionPower  Class for representing a product between two expressions.
/*!
  @author Samuel Quinodoz <samuel.quinodoz@epfl.ch>

  This class represents the product in the expression tree.

  <b> Template parameters </b>

  <i>LExpressionType</i>: The expression on the left side of the product operation.

  <i>RExpressionType</i>: The expression on the right side of the product operation.

  <b> Template requirements </b>

  <i>LExpressionType</i>: Copiable, static display method

  <i>RExpressionType</i>: Copiable, static display method

*/
template <typename BaseExpressionType>
class ExpressionPower : public ExpressionBase< ExpressionPower<BaseExpressionType> >
{
public:

    //! @name Public Types
    //@{

    // No direct use, just ease of coding
    typedef ExpressionBase< ExpressionPower <BaseExpressionType> > base_Type;

    //@}

    //! @name Constructors & Destructor
    //@{

    //! Full constructor using the two expressions
    ExpressionPower (const BaseExpressionType& l, const Real exponent)
        : base_Type(), M_l (l), M_exponent (exponent) {}

    //! Copy constructor
    ExpressionPower (const ExpressionPower<BaseExpressionType>& expression)
        : base_Type(), M_l (expression.M_l), M_exponent (expression.M_exponent) {}

    //! Destructor
    ~ExpressionPower() {}

    //@}


    //! @name Methods
    //@{

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

    //@}


    //! @name Private Methods
    //@{

    //! Getter for the left hand side
    const BaseExpressionType& base() const
    {
        return M_l;
    }

    //! Getter for the right hand side
    const Real& exponent() const
    {
        return M_exponent;
    }

    //@}

private:

    //! @name Private Methods
    //@{

    ExpressionPower();

    //@}


    // Left hand side
    BaseExpressionType M_l;

    // Right hand side
    Real M_exponent;
};


//! operator*  The generic operator for the product between expressions.
/*!
  @author Samuel Quinodoz <samuel.quinodoz@epfl.ch>

  Operator used in construction of the expression tree. To avoid shadowing
  other operator*, it uses the ExpressionBase type to distinguish expressions
  from other types.

  <b> Template parameters </b>

  <i>LExpressionType</i>: The expression on the left side of the product operation.

  <i>RExpressionType</i>: The expression on the right side of the product operation.

  <b> Template requirements </b>

  <i>LExpressionType</i>: Same as in LifeV::ExpressionProduct

  <i>RExpressionType</i>: Same as in LifeV::ExpressionProduct

*/

template< typename  ExpressionType>
ExpressionPower<ExpressionType>
pow (const ExpressionBase<ExpressionType>& l, const Real& r)
{
    return ExpressionPower<ExpressionType> (l.cast(), r);
}


} // Namespace ExpressionAssembly

} // Namespace LifeV

#endif