/usr/include/caf/ref_counted.hpp is in libcaf-dev 0.13.2-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* ____ _ _____ *
* / ___| / \ | ___| C++ *
* | | / _ \ | |_ Actor *
* | |___ / ___ \| _| Framework *
* \____/_/ \_|_| *
* *
* Copyright (C) 2011 - 2015 *
* Dominik Charousset <dominik.charousset (at) haw-hamburg.de> *
* *
* Distributed under the terms and conditions of the BSD 3-Clause License or *
* (at your option) under the terms and conditions of the Boost Software *
* License 1.0. See accompanying files LICENSE and LICENSE_ALTERNATIVE. *
* *
* If you did not receive a copy of the license files, see *
* http://opensource.org/licenses/BSD-3-Clause and *
* http://www.boost.org/LICENSE_1_0.txt. *
******************************************************************************/
#ifndef CAF_REF_COUNTED_HPP
#define CAF_REF_COUNTED_HPP
#include <atomic>
#include <cstddef>
#include "caf/memory_managed.hpp"
namespace caf {
/**
* Base class for reference counted objects with an atomic reference count.
* Serves the requirements of {@link intrusive_ptr}.
* @note *All* instances of `ref_counted` start with a reference count of 1.
* @relates intrusive_ptr
*/
class ref_counted : public memory_managed {
public:
~ref_counted();
ref_counted();
ref_counted(const ref_counted&);
ref_counted& operator=(const ref_counted&);
/**
* Increases reference count by one.
*/
inline void ref() noexcept {
m_rc.fetch_add(1, std::memory_order_relaxed);
}
/**
* Decreases reference count by one and calls `request_deletion`
* when it drops to zero.
*/
void deref() noexcept;
/**
* Queries whether there is exactly one reference.
*/
inline bool unique() const noexcept {
return m_rc == 1;
}
inline size_t get_reference_count() const noexcept {
return m_rc;
}
protected:
std::atomic<size_t> m_rc;
};
/**
* @relates ref_counted
*/
inline void intrusive_ptr_add_ref(ref_counted* p) {
p->ref();
}
/**
* @relates ref_counted
*/
inline void intrusive_ptr_release(ref_counted* p) {
p->deref();
}
} // namespace caf
#endif // CAF_REF_COUNTED_HPP
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