SquareMatrix.H

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/*---------------------------------------------------------------------------*\
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    Copyright (C) 2011-2016 OpenFOAM Foundation
    Copyright (C) 2019-2023 OpenCFD Ltd.
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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.

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    You should have received a copy of the GNU General Public License
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Class
    Foam::SquareMatrix

Description
    A templated (N x N) square matrix of objects of <Type>,
    containing N*N elements, derived from Matrix.

See also
    Test-SquareMatrix.C

SourceFiles
    SquareMatrixI.H
    SquareMatrix.C

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

#ifndef Foam_SquareMatrix_H
#define Foam_SquareMatrix_H

#include "Matrix.H"
#include "Identity.H"
#include <numeric>

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

namespace Foam
{

// Forward Declarations
template<class Type> class RectangularMatrix;


/*---------------------------------------------------------------------------*\
                        Class SquareMatrix Declaration
\*---------------------------------------------------------------------------*/

template<class Type>
class SquareMatrix
:
    public Matrix<SquareMatrix<Type>, Type>
{
public:

    // Generated Methods

        //- Default construct
        SquareMatrix() = default;

        //- Copy construct
        SquareMatrix(const SquareMatrix&) = default;

        //- Copy assignment
        SquareMatrix& operator=(const SquareMatrix&) = default;


    // Constructors

        //- Construct for given size (rows == cols)
        inline explicit SquareMatrix(const label n);

        //- Construct for given size (rows == cols)
        //- initializing all elements to zero
        inline SquareMatrix(const label n, const Foam::zero);

        //- Construct for given size (rows == cols)
        //- initializing all elements to the given value
        inline SquareMatrix(const label n, const Type& val);

        //- Construct for given size (rows == cols)
        //- initializing to the identity matrix
        template<class AnyType>
        inline SquareMatrix(const label n, const Identity<AnyType>);

        //- Construct for given size (rows == cols) by using a labelPair
        //- initializing to the identity matrix
        template<class AnyType>
        inline SquareMatrix(const labelPair& dims, const Identity<AnyType>);

        //- Construct given number of rows/columns
        //- by using a labelPair (checked to be equal)
        //  For constructor consistency in rectangular matrices
        inline explicit SquareMatrix(const labelPair& dims);

        //- Construct given number of rows/columns
        //- by using a labelPair (checked to be equal)
        //- and initializing all elements to zero
        //  For constructor consistency with rectangular matrices
        inline SquareMatrix(const labelPair& dims, const Foam::zero);

        //- Construct given number of rows/columns
        //- by using a labelPair (checked to be equal)
        //- and initializing all elements to the given value
        //  For constructor consistency with rectangular matrices
        inline SquareMatrix(const labelPair& dims, const Type& val);

        //- Construct given number of rows/columns (checked to be equal)
        //- initializing all elements to zero
        inline SquareMatrix(const label m, const label n, const Foam::zero);

        //- Construct from const sub-matrix block
        template<class MatrixType>
        inline SquareMatrix(const ConstMatrixBlock<MatrixType>& mat);

        //- Construct from sub-matrix block
        template<class MatrixType>
        inline SquareMatrix(const MatrixBlock<MatrixType>& mat);

        //- Construct as copy of a RectangularMatrix
        //- which is checked to be square
        inline explicit SquareMatrix(const RectangularMatrix<Type>& mat);

        //- Construct from Istream
        inline explicit SquareMatrix(Istream& is);

        //- Clone
        inline autoPtr<SquareMatrix<Type>> clone() const;


    // Member Functions

    // Edit

        //- Resize the matrix preserving the elements
        inline void resize(const label m);

        //- Resize the matrix \em without preserving existing content
        inline void resize_nocopy(const label n);

        //- Resize the matrix preserving the elements (compatibility)
        inline void resize(const label m, const label n);

        //- Resize the matrix preserving the elements
        inline void setSize(const label m);

        //- Resize the matrix without reallocating storage (unsafe)
        inline void shallowResize(const label m);

    // Check

        //- Return true if the square matrix is effectively symmetric/Hermitian
        inline bool symmetric() const;

        //- Return true if the square matrix is reduced tridiagonal
        inline bool tridiagonal() const;

    // Sort

        //- Return a sort permutation using the given comparison operator
        //- on the diagonal entries
        template<class CompOp>
        labelList sortPermutation(CompOp& compare) const;

        //- Column-reorder this Matrix according to the given permutation
        void applyPermutation(const labelUList& p);


    // Member Operators

        //- Move assignment
        inline void operator=(SquareMatrix<Type>&& mat);

        //- Assign all elements to zero
        inline void operator=(const Foam::zero);

        //- Assign all elements to value
        inline void operator=(const Type& val);

        //- Set to identity matrix
        template<class AnyType>
        void operator=(const Identity<AnyType>);
};


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

} // End namespace Foam

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

#include "SquareMatrixI.H"

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

#ifdef NoRepository
    #include "SquareMatrix.C"
#endif

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

#endif

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