randomRenumber.C

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/*---------------------------------------------------------------------------*\
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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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-------------------------------------------------------------------------------
    Copyright (C) 2011-2012 OpenFOAM Foundation
    Copyright (C) 2021-2024 OpenCFD Ltd.
-------------------------------------------------------------------------------
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
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#include "randomRenumber.H"
#include "Random.H"
#include "addToRunTimeSelectionTable.H"
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
namespace Foam
{
    defineTypeName(randomRenumber);
 
    addToRunTimeSelectionTable
    (
        renumberMethod,
        randomRenumber,
        dictionary
    );
}
 
 
// * * * * * * * * * * * * * * * Local Functions * * * * * * * * * * * * * * //
 
namespace Foam
{
 
labelList randomMap(const label nCells)
{
    Random rndGen(0);
 
    // Full coverage
    labelList newToOld(Foam::identity(nCells));
 
    // Fisher-Yates shuffle algorithm
    for (label i = nCells - 1; i > 0; --i)
    {
        label j = rndGen.position<label>(0, i);
        std::swap(newToOld[i], newToOld[j]);
    }
 
    return newToOld;
}
 
} // End namespace Foam
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::randomRenumber::randomRenumber()
:
    renumberMethod()
{}
 
 
Foam::randomRenumber::randomRenumber(const dictionary& dict)
:
    renumberMethod(dict)
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
Foam::labelList Foam::randomRenumber::renumber
(
    const label nCells
) const
{
    return randomMap(nCells);
}
 
 
Foam::labelList Foam::randomRenumber::renumber
(
    const pointField& cellCentres
) const
{
    return randomMap(cellCentres.size());
}
 
 
Foam::labelList Foam::randomRenumber::renumber
(
    const polyMesh& mesh
) const
{
    return randomMap(mesh.nCells());
}
 
 
Foam::labelList Foam::randomRenumber::renumber
(
    const CompactListList<label>& cellCells
) const
{
    return randomMap(cellCells.size());
}
 
 
Foam::labelList Foam::randomRenumber::renumber
(
    const labelListList& cellCells
) const
{
    return randomMap(cellCells.size());
}
 
 
// ************************************************************************* //