DecayForest.cc

/**************************************************************************
 * basf2 (Belle II Analysis Software Framework)                           *
 * Author: The Belle II Collaboration                                     *
 *                                                                        *
 * See git log for contributors and copyright holders.                    *
 * This file is licensed under LGPL-3.0, see LICENSE.md.                  *
 **************************************************************************/
 
#include <analysis/utility/DecayForest.h>
 
#include <cassert>
 
using namespace Belle2;
 
 
DecayForest::DecayForest(const std::string& full_decaystring, bool save_memory, bool removeRadiativeGammaFlag)
{
 
  m_first_valid_original = 0;
  unsigned int start = 0;
  for (unsigned int i = 0; i < full_decaystring.size(); ++i) {
    if (full_decaystring[i] == '|') {
      forest.emplace_back(full_decaystring.substr(start, i - start), removeRadiativeGammaFlag);
      start = i + 1;
      if (save_memory and forest.back().isValid() and forest.size() > 1)
        break;
    }
  }
 
  if (not(save_memory and forest.back().isValid() and forest.size() > 1))
    forest.emplace_back(full_decaystring.substr(start, full_decaystring.size() - start), removeRadiativeGammaFlag);
 
  for (unsigned int j = 1; j < forest.size(); ++j) {
    if (forest[j].isValid()) {
      m_first_valid_original = j;
      break;
    }
  }
 
}
 
 
int DecayForest::decayHashFloatToInt(float decayHash, float decayHashExtended)
{
 
  // Convert unsigned int decay hash into a float keeping the same bit pattern
  assert(sizeof(float) == sizeof(uint32_t));
 
  union convert {
    uint32_t i;
    float f;
  };
  convert bitconverter;
 
  uint64_t integer = 0;
 
  bitconverter.f = decayHash;
  integer = static_cast<uint64_t>(bitconverter.i) << 32;
  // cppcheck throws false positives here (doesn't understand this use of a union)
  //
  // cppcheck-suppress redundantAssignment
  bitconverter.f = decayHashExtended;
  integer += bitconverter.i;
 
  return integer;
 
}