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EvtAmpIndex.cpp
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EvtAmpIndex.cpp
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/***********************************************************************
* Copyright 1998-2020 CERN for the benefit of the EvtGen authors *
* *
* This file is part of EvtGen. *
* *
* EvtGen 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. *
* *
* EvtGen 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 EvtGen. If not, see <https://www.gnu.org/licenses/>. *
***********************************************************************/
#include "EvtGenBase/EvtAmpIndex.hh"
#include "EvtGenBase/EvtPatches.hh"
#include <vector>
using std::vector;
EvtAmpIndex::EvtAmpIndex( std::vector<int> ind ) :
_ind( ind ), _size( ind.size() ), _state( ind.size() ), _nstate( ind.size() )
{
int i;
for ( i = 0; i < _size; i++ ) {
_state[i] = 0;
if ( i == 0 ) {
_nstate[i] = 1;
} else {
_nstate[i] = _nstate[i - 1] * _ind[i];
}
}
}
void EvtAmpIndex::reset()
{
int i;
for ( i = 0; i < _size; i++ ) {
_state[i] = 0;
}
}
bool EvtAmpIndex::next()
{
int i;
for ( i = 0; i < _size; i++ ) {
_state[i]++;
if ( _state[i] < _ind[i] ) {
return true;
} else {
_state[i] = 0;
}
}
return false;
}
int EvtAmpIndex::index()
{
int i;
int ind = 0;
for ( i = 0; i < _size; i++ ) {
ind += _state[i] * _nstate[i];
}
return ind;
}

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