mirror of https://github.com/Icinga/icinga2.git
102 lines
1.7 KiB
C++
102 lines
1.7 KiB
C++
/* Icinga 2 | (c) 2019 Icinga GmbH | GPLv2+ */
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#ifndef SHARED_H
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#define SHARED_H
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#include "base/atomic.hpp"
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#include <boost/smart_ptr/intrusive_ptr.hpp>
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#include <cstdint>
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#include <utility>
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namespace icinga
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{
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template<class T>
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class Shared;
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template<class T>
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inline void intrusive_ptr_add_ref(Shared<T> *object)
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{
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object->m_References.fetch_add(1);
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}
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template<class T>
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inline void intrusive_ptr_release(Shared<T> *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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* Seamless wrapper 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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template<class T>
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class Shared : public T
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{
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friend void intrusive_ptr_add_ref<>(Shared<T> *object);
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friend void intrusive_ptr_release<>(Shared<T> *object);
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public:
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typedef boost::intrusive_ptr<Shared> Ptr;
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/**
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* Like std::make_shared, but for this class.
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*
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* @param args Constructor arguments
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*
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* @return Ptr
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*/
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template<class... Args>
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static inline
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Ptr Make(Args&&... args)
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{
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return new Shared(std::forward<Args>(args)...);
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}
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inline Shared(const Shared& origin) : Shared((const T&)origin)
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{
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}
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inline Shared(Shared&& origin) : Shared((T&&)origin)
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{
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}
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template<class... Args>
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inline Shared(Args&&... args) : T(std::forward<Args>(args)...), m_References(0)
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{
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}
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inline Shared& operator=(const Shared& rhs)
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{
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return operator=((const T&)rhs);
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}
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inline Shared& operator=(Shared&& rhs)
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{
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return operator=((T&&)rhs);
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}
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inline Shared& operator=(const T& rhs)
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{
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T::operator=(rhs);
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return *this;
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}
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inline Shared& operator=(T&& rhs)
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{
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T::operator=(std::move(rhs));
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return *this;
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}
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private:
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Atomic<uint_fast64_t> m_References;
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};
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}
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#endif /* SHARED_H */
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