ShallowCopy.icc

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef XAODCORE_SHALLOWCOPY_ICC
#define XAODCORE_SHALLOWCOPY_ICC
 
// System include(s).
#include <cassert>
 
namespace xAOD {
 
template <SG::IsAuxDataVector T>
std::pair<std::unique_ptr<T>, std::unique_ptr<ShallowAuxContainer>> shallowCopy(
    const T& cont, const EventContext& ctx) {
 
  // Create the new interface container.
  auto newCont = std::make_unique<T>();
  newCont->reserve(cont.size());
  for (const auto& elem : cont) {
    newCont->push_back(prepareElementForShallowCopy(elem));
  }
 
  // Create a new shallow auxiliary container.
  assert(cont.getConstStore() != nullptr);
  DataLink<SG::IConstAuxStore> link(cont.getConstStore(), ctx);
  assert(link.cptr() != nullptr);
  auto aux = std::make_unique<ShallowAuxContainer>(link);
 
  // Connect it to the interface container.
  newCont->setStore(aux.get());
 
  // Return the new objects:
  return {std::move(newCont), std::move(aux)};
}
 
template <SG::IsAuxDataVector T>
std::pair<std::unique_ptr<T>, std::unique_ptr<ShallowAuxContainer>> shallowCopy(
    const T& cont) {
 
  return shallowCopy(cont, Gaudi::Hive::currentContext());
}
 
template <SG::IsConstAuxElement T>
std::pair<std::unique_ptr<T>, std::unique_ptr<ShallowAuxInfo>> shallowCopy(
    const T& obj, const EventContext& ctx) {
 
  // Create the new interface object.
  auto newObj = prepareElementForShallowCopy(&obj);
 
  // Create a new shallow auxiliary container.
  assert(obj.getConstStore() != nullptr);
  DataLink<SG::IConstAuxStore> link(obj.getConstStore(), ctx);
  assert(link.cptr() != nullptr);
  auto aux = std::make_unique<ShallowAuxInfo>(link);
 
  // Connect it to the interface container.
  newObj->setStore(aux.get());
 
  // Return the new objects:
  return {std::move(newObj), std::move(aux)};
}
 
template <SG::IsConstAuxElement T>
std::pair<std::unique_ptr<T>, std::unique_ptr<ShallowAuxInfo>> shallowCopy(
    const T& obj) {
 
  return shallowCopy(obj, Gaudi::Hive::currentContext());
}
 
}  // namespace xAOD
 
#endif  // XAODCORE_SHALLOWCOPY_ICC