ToTransient.h

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// This file's extension implies that it's C, but it's really -*- C++ -*-.
/*
 * Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration.
 */
 
 
#ifndef ATHCONTAINERSINTERFACES_TOTRANSIENT_H
#define ATHCONTAINERSINTERFACES_TOTRANSIENT_H
 
 
class EventContext;
 
 
namespace SG {
 

template <class T>
class ToTransient
{
public:
  using noToTransient = int;
 
 
  /*
   * @brief Do post-read processing for object @c o.
   * @param o The object that was just read.
   *
   * The default implementation is a no-op.
   */
  static void toTransient (T& /*o*/)
  {
  }
 
 
  /*
   * @brief Do post-read processing for object @c o.
   * @param o The object that was just read.
   * @param ctx The current event context.
   *
   * The default implementation is a no-op.
   */
  static void toTransient (T& /*o*/, const EventContext& /*ctx*/)
  {
  }
};
 
 
template <class T, class U>
constexpr
bool noToTransient1 (U) { return false; }
template <class T>
constexpr
bool noToTransient1 (int, typename T::noToTransient = typename T::noToTransient()) { return true; }
 

template <class T>
constexpr
bool noToTransient() { return noToTransient1<ToTransient<T> > (123); }
 
 
} // namespace SG
 
 
#endif // not ATHCONTAINERSINTERFACES_TOTRANSIENT_H