SimG4CMS/Forward/src/TotemNumberMerger.cc - master - githubmirror/cmssw

SimG4CMS/Forward/src/TotemNumberMerger.cc
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11 май 2019, 12:09
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// -*- C++ -*-
//
// Package:     Forward
// Class  :     TotemNumberMerger
//
// Implementation:
//     <Notes on implementation>
//
// Original Author:  R. Capra
//         Created:  Tue May 16 10:14:34 CEST 2006
//

// system include files

// user include files
#include "SimG4CMS/Forward/interface/TotemNumberMerger.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"

//
// constructors and destructor
//
TotemNumberMerger ::TotemNumberMerger() {
#ifdef SCRIVI
  LogDebug("ForwardSim") << "Creating TotemNumberMerger";
#endif
}

TotemNumberMerger ::~TotemNumberMerger() {
#ifdef SCRIVI
  LogDebug("ForwardSim") << "Destruction of TotemNumberMerger";
#endif
}

//
// member functions
//

unsigned long TotemNumberMerger ::Merge(unsigned long value1, unsigned long value2) const {
  unsigned long c(value1 + value2);
  unsigned long result(((c * (c + 1)) >> 1) + value1);

#ifdef SCRIVI
  LogDebug("ForwardSim") << "Merge(value1=" << value1 << ", value2=" << value2 << ")=" << result;

  unsigned long invValue1, invValue2;
  Split(result, invValue1, invValue2);

  assert(invValue1 == value1);
  assert(invValue2 == value2);
#endif

  return result;
}

unsigned long TotemNumberMerger ::Merge(unsigned long value1, unsigned long value2, unsigned long value3) const {
  return Merge(Merge(value1, value2), value3);
}

unsigned long TotemNumberMerger ::Merge(unsigned long value1,
                                        unsigned long value2,
                                        unsigned long value3,
                                        unsigned long value4) const {
  return Merge(Merge(value1, value2), Merge(value3, value4));
}

void TotemNumberMerger ::Split(unsigned long source, unsigned long &value1, unsigned long &value2) const {
  unsigned long c(static_cast<unsigned long>(floor(sqrt(1. + 8. * static_cast<float>(source)) * 0.5 - 0.5)));

  value1 = source - ((c * (c + 1)) >> 1);
  value2 = c - value1;

#ifdef SCRIVI
  LogDebug("ForwardSim") << "source=" << source << ", c=" << c << ", value1=" << value1 << ", value2=" << value2;
#endif
}

void TotemNumberMerger ::Split(unsigned long source,
                               unsigned long &value1,
                               unsigned long &value2,
                               unsigned long &value3) const {
  unsigned long mix12;

  Split(source, mix12, value3);
  Split(mix12, value1, value2);
}

void TotemNumberMerger ::Split(unsigned long source,
                               unsigned long &value1,
                               unsigned long &value2,
                               unsigned long &value3,
                               unsigned long &value4) const {
  unsigned long mix12, mix34;

  Split(source, mix12, mix34);
  Split(mix12, value1, value2);
  Split(mix34, value3, value4);
}