VariadicUnionVarSet.h

/**************************************************************************
 * BASF2 (Belle Analysis Framework 2)                                     *
 * Copyright(C) 2015 - Belle II Collaboration                             *
 *                                                                        *
 * Author: The Belle II Collaboration                                     *
 * Contributors: Oliver Frost                                             *
 *                                                                        *
 * This software is provided "as is" without any warranty.                *
 **************************************************************************/
#pragma once
 
#include <tracking/trackFindingCDC/varsets/BaseVarSet.h>
#include <tracking/trackFindingCDC/varsets/UnionVarSet.h>
 
#include <tracking/trackFindingCDC/utilities/EvalVariadic.h>
#include <tracking/trackFindingCDC/utilities/Named.h>
#include <tracking/trackFindingCDC/utilities/MakeUnique.h>
#include <tracking/trackFindingCDC/utilities/MayBePtr.h>
 
#include <vector>
#include <string>
#include <cassert>
 
namespace Belle2 {
  namespace TrackFindingCDC {
 
    template <class... AVarSets>
    class VariadicUnionVarSet : public BaseVarSet<typename FirstType<AVarSets...>::Object> {
 
    private:
      using Super = BaseVarSet<typename FirstType<AVarSets...>::Object>;
 
    public:
      using Object = typename Super::Object;
 
    private:
      using ContainedVarSet = BaseVarSet<Object>;
 
    public:
      explicit VariadicUnionVarSet()
      {
        EvalVariadic{(m_multiVarSet.push_back(makeUnique<AVarSets>()), std::ignore)...};
        assert(m_multiVarSet.size() == sizeof...(AVarSets));
      }
 
    public:
      using Super::extract;
 
      void initialize() final {
        this->addProcessingSignalListener(&m_multiVarSet);
        Super::initialize();
      }
 
      bool extract(const Object* obj) final {
        return m_multiVarSet.extract(obj);
      }
 
      // Importing name from the base class.
      using Super::getNamedVariables;
 
      std::vector<Named<Float_t*>> getNamedVariables(const std::string& prefix) override
      {
        return m_multiVarSet.getNamedVariables(prefix);
      }
 
      MayBePtr<Float_t> find(const std::string& varName) override
      {
        return m_multiVarSet.find(varName);
      }
 
    private:
      UnionVarSet<Object> m_multiVarSet;
    };
  }
}