SmartDataPtr.h

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/***********************************************************************************\
* (c) Copyright 1998-2019 CERN for the benefit of the LHCb and ATLAS collaborations *
*                                                                                   *
* This software is distributed under the terms of the Apache version 2 licence,     *
* copied verbatim in the file "LICENSE".                                            *
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//  ====================================================================
//  SmartDataPtr.h
//  --------------------------------------------------------------------
//
//  Package    : GaudiKernel ( The LHCb Offline System)
//
//  Description: Implementation of a smart pointer class to access
//               easily (and efficiently) data stores.
//
//  Author     : M.Frank
//  ====================================================================
#ifndef GAUDIKERNEL_SMARTDATAPTR_H
#define GAUDIKERNEL_SMARTDATAPTR_H 1

// Framework include files
#include "GaudiKernel/DataObject.h"
#include "GaudiKernel/SmartDataStorePtr.h"

template <class TYPE>
class SmartDataPtr : public SmartDataStorePtr<TYPE, SmartDataObjectPtr::ObjectLoader> {
public:
#if !defined( __ICC ) && !defined( __COVERITY__ )
  // icc and Coverity do not like this line, they fail with
  // SmartDataPtr.h(147): internal error: assertion failed: add_symbol_to_overload_list:
  //   symbol not in symbol header list (shared/edgcpfe/symbol_tbl.c, line 4804)
  using SmartDataStorePtr<TYPE, SmartDataObjectPtr::ObjectLoader>::operator=;
#endif

  SmartDataPtr( IDataProviderSvc* pService, std::string fullPath )
      : SmartDataStorePtr<TYPE, SmartDataObjectPtr::ObjectLoader>( pService, nullptr, std::move( fullPath ) ) {}

  SmartDataPtr( IDataProviderSvc* pService, IRegistry* pDirectory )
      : SmartDataStorePtr<TYPE, SmartDataObjectPtr::ObjectLoader>( pService, pDirectory, "" ) {}

  SmartDataPtr( IDataProviderSvc* pService, DataObject* pObject, std::string path )
      : SmartDataStorePtr<TYPE, SmartDataObjectPtr::ObjectLoader>( pService, nullptr, std::move( path ) ) {
    if ( pObject ) this->m_pRegistry = pObject->registry();
  }

  SmartDataPtr( SmartDataObjectPtr& refObject, IRegistry* pDirectory )
      : SmartDataStorePtr<TYPE, SmartDataObjectPtr::ObjectLoader>( refObject.service(), pDirectory, "" ) {}

  SmartDataPtr( SmartDataObjectPtr& refObject, std::string path )
      : SmartDataStorePtr<TYPE, SmartDataObjectPtr::ObjectLoader>( refObject.service(), refObject.directory(),
                                                                   std::move( path ) ) {}

  SmartDataPtr( const SmartDataObjectPtr& copy ) : SmartDataStorePtr<TYPE, SmartDataObjectPtr::ObjectLoader>( copy ) {}

  virtual ~SmartDataPtr() = default;

  template <class OTHER>
  SmartDataPtr& operator=( OTHER* pObj ) {
    this->m_pObject = dynamic_cast<TYPE*>( pObj );
    return *this;
  }

  template <class OTHER>
  SmartDataPtr& operator=( const OTHER* pObj ) {
    this->m_pObject = dynamic_cast<TYPE*>( const_cast<OTHER*>( pObj ) );
    return *this;
  }
};

#endif // GAUDIKERNEL_SMARTDATAPTR_H