EvtAmpSubIndex.cc

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//--------------------------------------------------------------------------
//
// Environment:
//      This software is part of the EvtGen package developed jointly
//      for the BaBar and CLEO collaborations.  If you use all or part
//      of it, please give an appropriate acknowledgement.
//
// Copyright Information: See EvtGen/COPYRIGHT
//      Copyright (C) 2002      Caltech
//
// Module: EvtAmpSubIndex.cc
//
// Description: Class to manipulate the amplitudes in the decays.
//
// Modification history:
//
//    RYD     Nov 22, 2002         Module created
//
//------------------------------------------------------------------------
//
#include "EvtAmpSubIndex.hh"
#include "EvtAmpIndex.hh"
#include "EvtPatches.hh"
#include <vector>
using std::vector;
 
EvtAmpSubIndex::EvtAmpSubIndex( EvtAmpIndex* ind, std::vector<int> sub )
    : _ind( ind ), _sub( sub ), _size( sub.size() ), _nstate( sub.size() ) {
  int i;
 
  for ( i = 0; i < _size; i++ )
  {
    if ( i == 0 ) { _nstate[i] = 1; }
    else { _nstate[i] = _nstate[i - 1] * _ind->_ind[sub[i - 1]]; }
  }
}
 
int EvtAmpSubIndex::index() {
 
  int i;
  int ind = 0;
 
  for ( i = 0; i < _size; i++ ) { ind += _ind->_state[_ind->_ind[i]] * _nstate[i]; }
 
  return ind;
}