SimpleUpdater.h

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// This file's extension implies that it's C, but it's really -*- C++ -*-.
/*
 * Copyright (C) 2002-2023 CERN for the benefit of the ATLAS collaboration.
 */
#ifndef CXXUTILS_SIMPLEUPDATER_H
#define CXXUTILS_SIMPLEUPDATER_H
 
 
#include <atomic>
#include <vector>
#include <memory>
#include <algorithm>
 
 
namespace CxxUtils {
 
 
template <class T>
class SimpleUpdater
{
public:
  struct Context_t {};
 
  SimpleUpdater() = default;
 
 
  SimpleUpdater (SimpleUpdater&& other);
 
 
  const T& get() const;
 
 
  void update (std::unique_ptr<T> p, const Context_t&);
 
 
  void discard (std::unique_ptr<T> p);
 
 
  void quiescent (const Context_t&);
 
 
  void clean();
 
 
  void swap (SimpleUpdater& other);
 
 
  static const Context_t defaultContext();
 
 
private:
  std::atomic<const T*> m_obj = 0;
 
  std::vector<std::unique_ptr<T> > m_objs;
};
 
 
} // namespace CxxUtils
 
 
#include "CxxUtils/SimpleUpdater.icc"
 
 
#endif // not CXXUTILS_SIMPLEUPDATER_H