SingleElementSet.h

/**************************************************************************
 * 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.                  *
 **************************************************************************/
 
#pragma once
 
#include <tracking/trackFindingVXD/filterMap/filterFramework/TBranchLeafType.h>
#include <TBranch.h>
#include <TTree.h>
 
namespace Belle2 {
  template<typename Type>
  class SingleElementSet {
    Type m_element;
  public:
    explicit SingleElementSet(Type element):  m_element(element) {};
 
    template< class VariableType >
    inline bool contains(const VariableType& x) const { return x == m_element;};
 
    void persist(TTree* t, const std::string& branchName, const std::string& variableName)
    {
 
      std::string leafList;
      leafList += variableName;
      leafList += "_sup/";
      leafList += TBranchLeafType(m_element);
 
      TBranch* branch = new TBranch(t, branchName.c_str(), & m_element, leafList.c_str());
      t->GetListOfBranches()->Add(branch);
    }
 
    Type getElement(void) const { return m_element; } ;
 
    std::string getNameAndReference(std::vector<std::pair<char, void*>>* pointers = nullptr, const std::string& varname = "x")
    {
      std::string val = std::to_string(m_element);
      // if pointer to vector is provided fill it
      if (pointers != nullptr) {
        // use the position in the vector as unique identifier
        val = "#" + std::to_string(pointers->size());
        (*pointers).push_back({TBranchLeafType(m_element), &m_element});
      }
      return ("(" + val + " == " + varname + ")");
    }
  };
}