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a49ec1015d
This allows using ref-counted pointers to const objects. Adds a second typedef so that T::ConstPtr can be used similar to how T::Ptr currently is.
59 lines
1.2 KiB
C++
59 lines
1.2 KiB
C++
/* Icinga 2 | (c) 2019 Icinga GmbH | GPLv2+ */
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#ifndef SHARED_OBJECT_H
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#define SHARED_OBJECT_H
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#include "base/atomic.hpp"
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#include "base/object.hpp"
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#include <cstdint>
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namespace icinga
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{
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class SharedObject;
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inline void intrusive_ptr_add_ref(const SharedObject *object);
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inline void intrusive_ptr_release(const SharedObject *object);
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/**
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* Seamless and polymorphistic base for any class to create shared pointers of.
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* Saves a memory allocation compared to std::shared_ptr.
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*
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* @ingroup base
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*/
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class SharedObject
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{
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friend void intrusive_ptr_add_ref(const SharedObject *object);
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friend void intrusive_ptr_release(const SharedObject *object);
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protected:
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inline SharedObject() : m_References(0)
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{
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}
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SharedObject(const SharedObject&) = delete;
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SharedObject& operator=(const SharedObject&) = delete;
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inline virtual
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~SharedObject() = default;
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private:
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mutable Atomic<uint_fast64_t> m_References;
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};
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inline void intrusive_ptr_add_ref(const SharedObject *object)
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{
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object->m_References.fetch_add(1);
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}
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inline void intrusive_ptr_release(const SharedObject *object)
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{
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if (object->m_References.fetch_sub(1) == 1u) {
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delete object;
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}
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}
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}
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#endif /* SHARED_OBJECT_H */
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