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/* Icinga 2 | (c) 2019 Icinga GmbH | GPLv2+ */
#ifndef SHARED_OBJECT_H
#define SHARED_OBJECT_H
#include "base/atomic.hpp"
#include "base/object.hpp"
#include <cstdint>
namespace icinga
{
class SharedObject;
inline void intrusive_ptr_add_ref(SharedObject *object);
inline void intrusive_ptr_release(SharedObject *object);
/**
* Seamless and polymorphistic base for any class to create shared pointers of.
* Saves a memory allocation compared to std::shared_ptr.
*
* @ingroup base
*/
class SharedObject
{
friend void intrusive_ptr_add_ref(SharedObject *object);
friend void intrusive_ptr_release(SharedObject *object);
protected:
inline SharedObject() : m_References(0)
{
}
SharedObject(const SharedObject&) = delete;
SharedObject& operator=(const SharedObject&) = delete;
inline virtual
~SharedObject() = default;
private:
Atomic<uint_fast64_t> m_References;
};
inline void intrusive_ptr_add_ref(SharedObject *object)
{
object->m_References.fetch_add(1);
}
inline void intrusive_ptr_release(SharedObject *object)
{
if (object->m_References.fetch_sub(1) == 1u) {
delete object;
}
}
}
#endif /* SHARED_OBJECT_H */
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