DataProxy_cast.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 SGTOOLS_DATAPROXY_CAST_H
#define SGTOOLS_DATAPROXY_CAST_H
 
 
#include "AthenaKernel/StorableConversions.h"
#include "SGTools/exceptions.h"
#include <typeinfo>
 
 
namespace SG {
 
 
class DataProxy;
 


  template<typename DATA>
  DATA* DataProxy_cast(DataProxy* proxy);

  template<typename DATA>
  DATA DataProxy_cast(const DataProxy& proxy);

  void* DataProxy_cast(DataProxy* proxy, CLID clid, const std::type_info* tinfo = nullptr); 
 
 
template <typename DATA>
DATA* DataProxy_cast(SG::DataProxy* proxy) {
  typedef typename std::remove_const<DATA>::type DATA_nc;
  DataBucketTrait<DATA_nc>::init();
 
  return static_cast<DATA*>(DataProxy_cast (proxy, ClassID_traits<DATA>::ID(),
                                            &typeid(DATA_nc)));
}
 

template<typename DATA>
DATA DataProxy_cast(const SG::DataProxy& proxy)
{
  const DATA* result = SG::DataProxy_cast<DATA>(&proxy);
  if (!result) SG::throwExcBadDataProxyCast(proxy, typeid(DATA));
  return *result;
}
 
 
} // namespace SG
 
 
#endif // not SGTOOLS_DATAPROXY_CAST_H