CachedUniquePtr.h

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// This file's extension implies that it's C, but it's really -*- C++ -*-.
/*
 * Copyright (C) 2002-2019 CERN for the benefit of the ATLAS collaboration.
 */
#ifndef CXXUTILS_CACHEDUNIQUEPTR_H
#define CXXUTILS_CACHEDUNIQUEPTR_H
 
 
#include <atomic>
#include <memory>
 
 
namespace CxxUtils {
 
 
template <class T>
class CachedUniquePtrT
{
public:
  CachedUniquePtrT();
 
   
  CachedUniquePtrT (std::unique_ptr<T> elt);
 
 
  CachedUniquePtrT (CachedUniquePtrT&& other) noexcept;
 
 
  CachedUniquePtrT& operator= (CachedUniquePtrT&& other) noexcept;
 
 
  // Destructor.
  ~CachedUniquePtrT();
 
 
  T* set (std::unique_ptr<T> elt) const;
 
 
  void store (std::unique_ptr<T> elt) noexcept;
 
 
  T* get() const;
 
 
  T& operator*() const;
 
 
  T* operator->() const;
 
 
  explicit operator bool() const;
 
 
  std::unique_ptr<T> release() noexcept;
 
 
private:
  mutable std::atomic<T*> m_ptr;
};
 
 
template <class T>
using CachedUniquePtr = CachedUniquePtrT<const T>;
 
 
} // namespace CxxUtils
 
 
#include "CxxUtils/CachedUniquePtr.icc"
 
 
#endif // not CXXUTILS_CACHEDUNIQUEPTR_H