DBImportObjPtr.h

/**************************************************************************
 * BASF2 (Belle Analysis Framework 2)                                     *
 * Copyright(C) 2016 - Belle II Collaboration                             *
 *                                                                        *
 * Author: The Belle II Collaboration                                     *
 * Contributors: Marko Staric                                             *
 *                                                                        *
 * This software is provided "as is" without any warranty.                *
 **************************************************************************/
#pragma once
 
#include <framework/database/DBImportBase.h>
#include <stdexcept>
 
namespace Belle2 {
  template<class T> class DBImportObjPtr: public DBImportBase {
  public:
 
    explicit DBImportObjPtr(const std::string& name = ""):
      DBImportBase(DBStore::objectName<T>(name))
    {}
 
    ~DBImportObjPtr()
    {
      if (m_object) delete m_object;
    }
 
    template<class ...Args> void construct(Args&& ... params)
    {
      if (m_object) delete m_object;
      m_object = new T(std::forward<Args>(params)...);
    }
 
    inline T* operator ->() const
    {
      if (!m_object)
        throw std::out_of_range("DBImportObjPtr::operator ->, for "
                                + getName() + ", "
                                "object does not exist or is invisible");
      return static_cast<T*>(m_object);
    }
 
  };
}