HashTableCore.C

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License
    This file is part of OpenFOAM.
 
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#include "HashTable.H"
#include "uLabel.H"
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
namespace Foam
{
defineTypeNameAndDebug(HashTableCore, 0);
}
 
const Foam::label Foam::HashTableCore::maxTableSize
(
    Foam::HashTableCore::canonicalSize
    (
        Foam::labelMax/2
    )
);
 
 
// * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
 
Foam::label Foam::HashTableCore::canonicalSize(const label size)
{
    if (size < 1)
    {
        return 0;
    }
 
    // enforce power of two
    uLabel goodSize = size;
 
    if (goodSize & (goodSize - 1))
    {
        // brute-force is fast enough
        goodSize = 1;
        while (goodSize < unsigned(size))
        {
            goodSize <<= 1;
        }
    }
 
    return goodSize;
}
 
 
// ************************************************************************* //