KeyedTraits.h

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* (c) Copyright 1998-2019 CERN for the benefit of the LHCb and ATLAS collaborations *
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* copied verbatim in the file "LICENSE".                                            *
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#ifndef GAUDIKERNEL_KEYEDTRAITS_H
#define GAUDIKERNEL_KEYEDTRAITS_H

#define CHECK_KEYED_CONTAINER

// Include files
#include "GaudiKernel/Kernel.h" // GAUDI_API
#include <vector>

// Forward declarations
template <class K>
class KeyedObject;
template <class T, class M>
class KeyedContainer;

/*
  Namespace for Key classes used by the Keyed Container
*/
namespace Containers {

  // Status enumeration
  enum {
    OBJ_NOT_FOUND,    
    OBJ_DELETED,      
    OBJ_ERASED,       
    OBJ_INSERTED,     
    OBJ_CANNOT_INSERT 
  };

  // Forward declarations

  template <class CONTAINER, class DATATYPE>
  struct traits;
  template <class KEY>
  struct key_traits;
  template <class SETUP>
  class KeyedObjectManager;

  GAUDI_API void cannotInsertToContainer();

  GAUDI_API void containerIsInconsistent();

  GAUDI_API void invalidContainerOperation();

  GAUDI_API void cannotAssignObjectKey();

  template <class KEY>
  struct key_traits {
    typedef KEY key_type;
    typedef KeyedObject<key_type> obj_type;
    static key_type makeKey( long k ) { return key_type( k ); }
    static key_type makeKey( int k ) { return key_type( k ); }
    static long identifier( const key_type& k ) { return k; }
    static long hash( const key_type& key_value ) { return key_value; }
    static void setKey( obj_type* v, const key_type& k ) {
      if ( v ) v->setKey( k );
    }
    static bool checkKey( obj_type* v, const key_type& k ) {
#ifdef CHECK_KEYED_CONTAINER
      return ( v ) ? ( hash( v->key() ) == hash( k ) ) : false;
#else
      return true;
#endif
    }
    static long addRef( obj_type* v ) { return ( v ) ? v->addRef() : 0; }
    static long release( obj_type* v ) { return ( v ) ? v->release() : 0; }
  };

  template <class CONTAINER, class DATATYPE>
  struct traits : public key_traits<typename DATATYPE::key_type> {
    static bool checkBounds( const std::vector<DATATYPE*>* cnt, const typename DATATYPE::key_type& k ) {
#ifdef CHECK_KEYED_CONTAINER
      return size_t( cnt->size() ) > size_t( traits::hash( k ) );
#else
      return true;
#endif
    }
  };
} // namespace Containers
#endif // GAUDIKERNEL_KEYEDTRAITS_H