StoreGate/StoreGate/ReadHandleKey.h

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// This file's extension implies that it's C, but it's really -*- C++ -*-.
 
/*
  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
*/
 
 
#ifndef STOREGATE_READHANDLEKEY_H
#define STOREGATE_READHANDLEKEY_H
 
 
#include "StoreGate/VarHandleKey.h"
#include "StoreGate/exceptions.h"
#include "AthenaKernel/CLASS_DEF.h"
#include <concepts>
 
 
namespace SG {
 

template <class T>
class ReadHandleKey
  : public VarHandleKey
{
public:
  explicit
  ReadHandleKey (const std::string& key = "",
                 const std::string& storeName = StoreID::storeName(StoreID::EVENT_STORE));
 

  template <std::derived_from<IProperty> OWNER>
  ReadHandleKey( OWNER* owner,
                 const std::string& name,
                 const std::string& key = {},
                 const std::string& doc = "");
 
  
  ReadHandleKey& operator= (const std::string& sgkey);
 
 
protected:
  ReadHandleKey (CLID clid,
                 const std::string& key,
                 const std::string& storeName);
 

  template <std::derived_from<IProperty> OWNER>
  ReadHandleKey( CLID clid,
                 OWNER* owner,
                 const std::string& name,
                 const std::string& key,
                 const std::string& doc);
};
 

template <class T>
class InitializedReadHandleKey
  : public ReadHandleKey<T>
{
public:
  InitializedReadHandleKey (const std::string& key = "",
                            const std::string& storeName = StoreID::storeName(StoreID::EVENT_STORE));
};
 
 
} // namespace SG
 
 
#include "StoreGate/ReadHandleKey.icc"
 
 
#endif // not STOREGATE_READHANDLEKEY_H