Tensor2D.H

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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::Tensor2D
 
Description
    Templated 2D tensor derived from VectorSpace adding construction from
    4 components, element access using xx(), xy(), yx() and yy() member
    functions and the iner-product (dot-product) and outer-product of two
    Vector2Ds (tensor-product) operators.
 
SourceFiles
    Tensor2DI.H
 
\*---------------------------------------------------------------------------*/
 
#ifndef Tensor2D_H
#define Tensor2D_H
 
#include "Vector2D.H"
#include "SphericalTensor2D.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
template<class Cmpt>
class SymmTensor2D;
 
/*---------------------------------------------------------------------------*\
                          Class Tensor2D Declaration
\*---------------------------------------------------------------------------*/
 
template<class Cmpt>
class Tensor2D
:
    public VectorSpace<Tensor2D<Cmpt>, Cmpt, 4>
{
 
public:
 
    //- Equivalent type of labels used for valid component indexing
    typedef Tensor2D<label> labelType;
 
 
    // Member constants
 
        //- Rank of Tensor2D is 2
        static const direction rank = 2;
 
 
    // Static Data Members
 
        static const Tensor2D I;
 
 
    //- Component labeling enumeration
    enum components { XX, XY, YX, YY };
 
 
    // Constructors
 
        //- Construct null
        inline Tensor2D();
 
        //- Construct initialised to zero
        inline Tensor2D(const Foam::zero);
 
        //- Construct given VectorSpace
        inline Tensor2D(const VectorSpace<Tensor2D<Cmpt>, Cmpt, 4>&);
 
        //- Construct given SymmTensor2D
        inline Tensor2D(const SymmTensor2D<Cmpt>&);
 
        //- Construct given SphericalTensor2D
        inline Tensor2D(const SphericalTensor2D<Cmpt>&);
 
        //- Construct given the two vectors
        inline Tensor2D
        (
            const Vector2D<Cmpt>& x,
            const Vector2D<Cmpt>& y
        );
 
        //- Construct given the four components
        inline Tensor2D
        (
            const Cmpt txx, const Cmpt txy,
            const Cmpt tyx, const Cmpt tyy
        );
 
        //- Construct from Istream
        Tensor2D(Istream&);
 
 
    // Member Functions
 
        // Access
 
            inline const Cmpt& xx() const;
            inline const Cmpt& xy() const;
            inline const Cmpt& yx() const;
            inline const Cmpt& yy() const;
 
            inline Cmpt& xx();
            inline Cmpt& xy();
            inline Cmpt& yx();
            inline Cmpt& yy();
 
            // Access vector components.
 
            inline Vector2D<Cmpt> x() const;
            inline Vector2D<Cmpt> y() const;
 
        //- Transpose
        inline Tensor2D<Cmpt> T() const;
 
 
    // Member Operators
 
        //- Copy SymmTensor2D
        inline void operator=(const SymmTensor2D<Cmpt>&);
 
        //- Copy SphericalTensor2D
        inline void operator=(const SphericalTensor2D<Cmpt>&);
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
// Include inline implementations
#include "Tensor2DI.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //