/*---------------------------------------------------------------------------*\
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License
    This file is part of OpenFOAM.

    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    OpenFOAM 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 General Public License
    for more details.

    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.

Class
    Foam::forceSuSp

Description
    Helper container for force Su and Sp terms.

        F = Sp(U - Up) + Su

    Explicit contribution, Su specified as a force
    Implicit coefficient, Sp specified as force/velocity

SourceFiles
    forceSuSpI.H

\*---------------------------------------------------------------------------*/

#ifndef forceSuSp_H
#define forceSuSp_H

#include "Tuple2.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

namespace Foam
{

// Forward declaration of friend functions

class forceSuSp;

inline forceSuSp operator+(const forceSuSp& susp1, const forceSuSp& susp2);
inline forceSuSp operator*(const scalar s, const forceSuSp& susp);


/*---------------------------------------------------------------------------*\
                          Class forceSuSp Declaration
\*---------------------------------------------------------------------------*/

class forceSuSp
:
    public Tuple2<vector, scalar>
{

public:

    // Constructors

        //- Construct null
        inline forceSuSp();

        //- Construct given Tuple2
        inline forceSuSp(const Tuple2<vector, scalar>& susp);

        //- Construct given two components
        inline forceSuSp(const vector& Su, const scalar Sp);

        //- Construct from Istream
        inline forceSuSp(Istream&);


    // Member Functions

        // Access

            //- Return const access to the explicit contribution [kg m/s^2]
            inline const vector& Su() const;

            //- Return const access to the implicit coefficient [kg/s]
            inline scalar Sp() const;


        // Edit

            //- Return reference to the explicit contribution
            inline vector& Su();

            //- Return reference to the implicit coefficient
            inline scalar& Sp();


        // Operators

            //- Addition
            inline void operator+=(const forceSuSp& susp);

            //- Subtraction
            inline void operator-=(const forceSuSp& susp);


        // Friend operators

            //- Addition
            friend inline forceSuSp operator*
            (
                const forceSuSp& susp1,
                const forceSuSp& susp2
            );

            //- Multiplication
            friend inline forceSuSp operator*
            (
                const scalar s,
                const forceSuSp& susp
            );
};


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

} // End namespace Foam

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#include "forceSuSpI.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#endif

// ************************************************************************* //
