McEventCollectionCnv_utils.h

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namespace {
  // helper method to compute the number of particles and vertices in a
  // whole McEventCollection
  std::pair<unsigned int,unsigned int>
  nbrParticlesAndVertices( const McEventCollection* mcEvents ) {
    unsigned int nParts = 0;
    unsigned int nVerts = 0;
    const McEventCollection::const_iterator itrEnd = mcEvents->end();
    for ( McEventCollection::const_iterator itr = mcEvents->begin();
          itr != itrEnd;
          ++itr ) {
      nParts += (*itr)->particles_size();
      nVerts += (*itr)->vertices_size();
    }
 
    return std::make_pair( nParts, nVerts );
  }
std::map<std::string, unsigned long int> names_to_name_index_map(const  std::vector<std::string>  &input )
{
std::map<std::string, unsigned long int> result;
unsigned long int i=0;
for (const auto& a: input) {result[a]=i; i++;}
return result;
}
 
std::vector<std::pair<int,int> > vector_to_vector_int_int(const  std::vector<int>  &input )
{
// The "i" values used here now match HepMC2 most of the time, but still differ sometimes.
std::vector<std::pair<int,int> > result;
unsigned long int i=1;
for (const auto& a: input) {result.push_back(std::pair<int,int>(i,a)); i++;}
return result;
}
}