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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2018-2026 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/>.
\*---------------------------------------------------------------------------*/
#include "randomGenerator.H"
#include "Hash.H"
// * * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * //
inline uint64_t Foam::randomGenerator::seed::x(const bool global) const
{
const uint64_t localS =
global ? s_ : s_ + (UINT64_MAX/Pstream::nProcs())*Pstream::myProcNo();
return (localS << 16) + 0x330E;
}
inline void Foam::randomGenerator::checkSync() const
{
if (global_)
{
uint64_t xMaster = x_;
Pstream::scatter(xMaster);
if (xMaster != x_)
{
FatalErrorInFunction
<< "Global random number generator is not synchronised"
<< exit(FatalError);
}
}
}
inline uint64_t Foam::randomGenerator::sample()
{
x_ = (A*x_ + C) % M;
return x_ >> 17;
}
inline Foam::scalar Foam::randomGenerator::scalar01NoCheckSync()
{
return scalar(sample())/(M >> 17);
}
inline Foam::scalar Foam::randomGenerator::scalarABNoCheckSync
(
const scalar a,
const scalar b
)
{
return a + scalar01NoCheckSync()*(b - a);
}
template<class Type>
inline Type Foam::randomGenerator::sample01NoCheckSync()
{
Type value;
for (direction i = 0; i < pTraits<Type>::nComponents; ++ i)
{
value.component(i) = scalar01NoCheckSync();
}
return value;
}
template<>
inline Foam::scalar Foam::randomGenerator::sample01NoCheckSync()
{
return scalar01NoCheckSync();
}
template<>
inline Foam::label Foam::randomGenerator::sample01NoCheckSync()
{
return sample() % 2;
}
template<class Type>
inline Type Foam::randomGenerator::sampleABNoCheckSync
(
const Type& a,
const Type& b
)
{
return a + cmptMultiply(sample01NoCheckSync<Type>(), b - a);
}
template<>
inline Foam::scalar Foam::randomGenerator::sampleABNoCheckSync
(
const scalar& a,
const scalar& b
)
{
return scalarABNoCheckSync(a, b);
}
template<>
inline Foam::label Foam::randomGenerator::sampleABNoCheckSync
(
const label& a,
const label& b
)
{
return a + sample() % (b - a);
}
// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
inline Foam::randomGenerator::seed::seed(const label s)
:
s_(s)
{}
inline Foam::randomGenerator::seed::seed(const word& s)
:
s_(Hash<word>()(s))
{}
inline Foam::randomGenerator::randomGenerator(const seed s, const bool global)
:
global_(global),
x_(s.x(global))
{
checkSync();
}
inline Foam::randomGenerator::randomGenerator(const randomGenerator& rndGen)
:
global_(rndGen.global_),
x_(rndGen.x_)
{
checkSync();
}
inline Foam::randomGenerator::randomGenerator(randomGenerator&& rndGen)
:
randomGenerator(static_cast<const randomGenerator&>(rndGen))
{}
// * * * * * * * * * * * * * * * * Destructor * * * * * * * * * * * * * * * //
inline Foam::randomGenerator::~randomGenerator()
{}
// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
inline Foam::scalar Foam::randomGenerator::scalar01()
{
#ifdef FULLDEBUG
checkSync();
#endif
return scalar01NoCheckSync();
}
inline Foam::tmp<Foam::scalarField> Foam::randomGenerator::scalar01
(
const label n
)
{
#ifdef FULLDEBUG
checkSync();
#endif
tmp<scalarField> tValues(new scalarField(n));
for (label i = 0; i < n; ++ i)
{
tValues.ref()[i] = scalar01NoCheckSync();
}
return tValues;
}
inline Foam::scalar Foam::randomGenerator::scalarAB
(
const scalar a,
const scalar b
)
{
#ifdef FULLDEBUG
checkSync();
#endif
return scalarABNoCheckSync(a, b);
}
inline Foam::tmp<Foam::scalarField> Foam::randomGenerator::scalarAB
(
const label n,
const scalar a,
const scalar b
)
{
#ifdef FULLDEBUG
checkSync();
#endif
tmp<scalarField> tValues(new scalarField(n));
for (label i = 0; i < n; ++ i)
{
tValues.ref()[i] = scalarABNoCheckSync(a, b);
}
return tValues;
}
template<class Type>
inline Type Foam::randomGenerator::sample01()
{
#ifdef FULLDEBUG
checkSync();
#endif
return sample01NoCheckSync<Type>();
}
template<class Type>
inline Foam::tmp<Foam::Field<Type>> Foam::randomGenerator::sample01
(
const label n
)
{
#ifdef FULLDEBUG
checkSync();
#endif
tmp<Field<Type>> tValues(new Field<Type>(n));
for (label i = 0; i < n; ++ i)
{
tValues.ref()[i] = sample01NoCheckSync<Type>();
}
return tValues;
}
template<class Type>
inline Type Foam::randomGenerator::sampleAB(const Type& a, const Type& b)
{
#ifdef FULLDEBUG
checkSync();
#endif
return sampleABNoCheckSync(a, b);
}
template<class Type>
inline Foam::tmp<Foam::Field<Type>> Foam::randomGenerator::sampleAB
(
const label n,
const Type& a,
const Type& b
)
{
#ifdef FULLDEBUG
checkSync();
#endif
tmp<Field<Type>> tValues(new Field<Type>(n));
for (label i = 0; i < n; ++ i)
{
tValues.ref()[i] = sampleABNoCheckSync(a, b);
}
return tValues;
}
template<class Container>
inline void Foam::randomGenerator::permute(Container& l)
{
#ifdef FULLDEBUG
checkSync();
#endif
for (label i = 0; i < l.size(); ++ i)
{
Swap(l[i], l[sampleABNoCheckSync<label>(i, l.size())]);
}
}
inline Foam::labelList Foam::randomGenerator::permutation(const label n)
{
labelList result(identityMap(n));
permute(result);
return result;
}
inline Foam::randomGenerator Foam::randomGenerator::generator()
{
return randomGenerator(sample(), global_);
}
// ************************************************************************* //
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