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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2011-2023 OpenFOAM Foundation
\\/ 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 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::Hash
Description
Hash function class for primitives. All non-primitives used to hash
entries on hash tables likely need a specialised version of this class.
\*---------------------------------------------------------------------------*/
#ifndef Hash_H
#define Hash_H
#include "label.H"
#include "uLabel.H"
#include "Hasher.H"
#include "pTraits.H"
#include "fileName.H"
#include "wordRe.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 specialisation 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;
}
};
//- Hash specialisation for hashing strings
template<>
class Hash<Foam::string>
{
public:
Hash()
{}
unsigned operator()(const string& p, unsigned seed) const
{
return string::hash()(p, seed);
}
unsigned operator()(const string& p) const
{
return string::hash()(p);
}
};
//- Hash specialisation for hashing words
template<>
class Hash<Foam::word>
{
public:
Hash()
{}
unsigned operator()(const word& p, unsigned seed) const
{
return word::hash()(p, seed);
}
unsigned operator()(const word& p) const
{
return word::hash()(p);
}
};
//- Hash specialisation for hashing fileNames
template<>
class Hash<Foam::fileName>
{
public:
Hash()
{}
unsigned operator()(const fileName& p, unsigned seed) const
{
return fileName::hash()(p, seed);
}
unsigned operator()(const fileName& p) const
{
return fileName::hash()(p);
}
};
//- Hash specialisation for hashing wordRes
template<>
class Hash<Foam::wordRe>
{
public:
Hash()
{}
unsigned operator()(const wordRe& p, unsigned seed) const
{
return wordRe::hash()(p, seed);
}
unsigned operator()(const wordRe& p) const
{
return wordRe::hash()(p);
}
};
//- Hash specialisation for hashing keyTypes
template<>
class Hash<Foam::keyType>
{
public:
Hash()
{}
unsigned operator()(const keyType& p, unsigned seed) const
{
return keyType::hash()(p, seed);
}
unsigned operator()(const keyType& p) const
{
return keyType::hash()(p);
}
};
//- Hash specialisation 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));
}
};
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace Foam
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#endif
// ************************************************************************* //
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