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// @(#)root/mathcore:$Id$
// Authors: L. Moneta 8/2015
/**********************************************************************
* *
* Copyright (c) 2015 , ROOT MathLib Team *
* *
* *
**********************************************************************/
// implementation file of MixMax engine
//
//
// Created by: Lorenzo Moneta : Tue 4 Aug 2015
//
//
#ifndef ROOT_Math_MixMaxEngine_icc
#define ROOT_Math_MixMaxEngine_icc
#ifndef ROOT_Math_MixMaxEngine
#error "Do not use MixMaxEngine.icc directly. #include \"MixMaxEngine.h\" instead."
#endif // ROOT_Math_MixMaxEngine
//#include "Math/mixmax/mixmax.h"
#include <cassert>
#include "Math/Util.h"
namespace ROOT {
namespace Math {
template<int N, int S>
MixMaxEngine<N,S>::MixMaxEngine(uint64_t seed) {
// fRng = new mixmax::mixmax_engine<N>();
// fRng->seed(seed);
fRng = new MixMaxEngineImpl<N>(seed);
}
template<int N, int S>
MixMaxEngine<N,S>::~MixMaxEngine() {
if (fRng) delete fRng;
}
// void template<int N, int S>
//MixMaxEngine<N,S>::SeedUniqueStream(unsigned int clusterID, unsigned int machineID, unsigned int runID, unsigned int streamID) {
// seed_uniquestream(fRngState, clusterID, machineID, runID, streamID);
// }
template<int N, int S>
void MixMaxEngine<N,S>::SetSeed(uint64_t seed) {
//fRng->seed(seed);
fRng->SetSeed(seed);
}
// void template<int N, int S>
// MixMaxEngine<N,S>::SetSeed64(uint64_t seed) {
// seed_spbox(fRngState, seed);
// iterate(fRngState);
// }
// unsigned int template<int N, int S>
// MixMaxEngine<N,S>::GetSeed() const {
// return get_next(fRngState);
// }
// generate one random number in interval ]0,1]
// apply skipping when needed
template<int SkipNumber>
struct SkipFunction {
template<class Engine>
static void Apply (Engine * rng, int counter, int n) {
// apply skipping
if (counter < n) return;
for (int iskip = 0; iskip < SkipNumber; ++iskip)
rng->Iterate();
}
};
// specialization for SkipNumber = 0
template<>
struct SkipFunction<0> {
template<class Engine>
static void Apply (Engine *, int , int ) {
// no operation
}
};
template<int N, int S>
double MixMaxEngine<N,S>::Rndm_impl() {
int counter = fRng->Counter();
SkipFunction<S>::Apply(fRng, counter, N);
//reset counter to original value
// otherwise we would skip -1 time
fRng->SetCounter(counter);
return fRng->Rndm();
}
// generate one integer number
template<int N, int S>
uint64_t MixMaxEngine<N,S>::IntRndm() {
int counter = fRng->Counter();
SkipFunction<S>::Apply(fRng, counter,N);
fRng->SetCounter(counter);
return fRng->IntRndm();
}
template<int N, int S>
uint64_t MixMaxEngine<N,S>::MaxInt() {
//return mixmax::mixmax_engine<N>::max();
return 2305843009213693951ULL;
}
template<int N, int S>
uint64_t MixMaxEngine<N,S>::MinInt() {
//return mixmax::mixmax_engine<N>::min();
return 0;
}
template<int N, int S>
void MixMaxEngine<N,S>::RndmArray(int n, double *array){
// Return an array of n random numbers uniformly distributed in ]0,1]
for (int i = 0; i < n; ++i)
array[i] = Rndm_impl();
}
template<int N, int S>
void MixMaxEngine<N,S>::SetState(const std::vector<StateInt_t> & state) {
assert(state.size() >= N);
// for (int i = 0; i < N; ++i)
// fRng->S.V[i] = state[i];
// //set counter to fore iteration afterwards
// fRng->S.counter = N;
fRng->SetState(state);
fRng->SetCounter(N);
}
template<int N, int S>
void MixMaxEngine<N,S>::GetState(std::vector<StateInt_t> & state) const {
state.resize(N);
fRng->GetState(state);
}
template<int N, int S>
int MixMaxEngine<N,S>::Size() {
return MixMaxEngineImpl<N>::Size();
}
template<int N, int S>
int MixMaxEngine<N,S>::Counter() const {
return fRng->Counter();
}
template<int N, int S>
std::string MixMaxEngine<N,S>::Name() {
std::string name = "MixMax";
name += Util::ToString(N);
if (S > 0) name += std::string("_") + Util::ToString(S);
return name;
}
} // namespace Math
} // namespace ROOT
#endif
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