mirror of
https://develop.openfoam.com/Development/openfoam.git
synced 2025-11-28 03:28:01 +00:00
134 lines
3.4 KiB
C++
134 lines
3.4 KiB
C++
/*---------------------------------------------------------------------------*\
|
|
========= |
|
|
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
|
|
\\ / O peration |
|
|
\\ / A nd | Copyright (C) 1991-2009 OpenCFD Ltd.
|
|
\\/ M anipulation |
|
|
-------------------------------------------------------------------------------
|
|
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 2 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, write to the Free Software Foundation,
|
|
Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
|
|
Class
|
|
Foam::Hash
|
|
|
|
Description
|
|
Hash function class for primitives. All non-primitives used to hash
|
|
entries on hash tables likely need a specialized version of this class.
|
|
|
|
\*---------------------------------------------------------------------------*/
|
|
|
|
#ifndef Hash_H
|
|
#define Hash_H
|
|
|
|
#include "label.H"
|
|
#include "uLabel.H"
|
|
#include "Hasher.H"
|
|
#include "pTraits.H"
|
|
|
|
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
|
|
|
|
namespace Foam
|
|
{
|
|
|
|
/*---------------------------------------------------------------------------*\
|
|
Class Hash Declaration
|
|
\*---------------------------------------------------------------------------*/
|
|
|
|
template<class PrimitiveType>
|
|
class Hash
|
|
{
|
|
public:
|
|
|
|
Hash()
|
|
{}
|
|
|
|
unsigned operator()(const PrimitiveType& p, unsigned seed) const
|
|
{
|
|
return Hasher(&p, sizeof(p), seed);
|
|
}
|
|
|
|
unsigned operator()(const PrimitiveType& p) const
|
|
{
|
|
return Hasher(&p, sizeof(p));
|
|
}
|
|
|
|
};
|
|
|
|
|
|
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
|
|
|
|
//- Hash specialization for hashing pointer addresses.
|
|
// Treat a pointer like a long.
|
|
// This should work for both 32-bit and 64-bit pointers.
|
|
template<>
|
|
class Hash<void*>
|
|
{
|
|
public:
|
|
|
|
Hash()
|
|
{}
|
|
|
|
unsigned operator()(const void* const& p, unsigned seed) const
|
|
{
|
|
return Hash<long>()(long(p), seed);
|
|
}
|
|
|
|
unsigned operator()(const void* const& p) const
|
|
{
|
|
return Hash<long>()(long(p));
|
|
}
|
|
|
|
};
|
|
|
|
|
|
//- Hash specialization for hashing labels
|
|
template<>
|
|
class Hash<Foam::label>
|
|
{
|
|
public:
|
|
|
|
Hash()
|
|
{}
|
|
|
|
//- Incrementally hash a label.
|
|
// This will necessarily return a different value than the
|
|
// non-incremental version.
|
|
unsigned operator()(const label p, unsigned seed) const
|
|
{
|
|
return Hasher(&p, sizeof(label), seed);
|
|
}
|
|
|
|
//- Return the unsigned representation of a label.
|
|
// This helps if people have relied on the hash value corresponding to
|
|
// the natural order.
|
|
unsigned operator()(const label p) const
|
|
{
|
|
return p;
|
|
}
|
|
};
|
|
|
|
|
|
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
|
|
|
|
} // End namespace Foam
|
|
|
|
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
|
|
|
|
#endif
|
|
|
|
// ************************************************************************* //
|