osb/source/core/StarRefPtr.hpp

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#ifndef STAR_REF_PTR_HPP
#define STAR_REF_PTR_HPP
#include "StarException.hpp"
#include "StarHash.hpp"
namespace Star {
// Reference counted ptr for intrusive reference counted types. Calls
// unqualified refPtrIncRef and refPtrDecRef functions to manage the reference
// count.
template <typename T>
class RefPtr {
public:
typedef T element_type;
RefPtr();
explicit RefPtr(T* p, bool addRef = true);
RefPtr(RefPtr const& r);
RefPtr(RefPtr&& r);
template <typename T2>
RefPtr(RefPtr<T2> const& r);
template <typename T2>
RefPtr(RefPtr<T2>&& r);
~RefPtr();
RefPtr& operator=(RefPtr const& r);
RefPtr& operator=(RefPtr&& r);
template <typename T2>
RefPtr& operator=(RefPtr<T2> const& r);
template <typename T2>
RefPtr& operator=(RefPtr<T2>&& r);
void reset();
void reset(T* r, bool addRef = true);
T& operator*() const;
T* operator->() const;
T* get() const;
explicit operator bool() const;
private:
template <typename T2>
friend class RefPtr;
T* m_ptr;
};
template <typename T, typename U>
bool operator==(RefPtr<T> const& a, RefPtr<U> const& b);
template <typename T, typename U>
bool operator!=(RefPtr<T> const& a, RefPtr<U> const& b);
template <typename T>
bool operator==(RefPtr<T> const& a, T* b);
template <typename T>
bool operator!=(RefPtr<T> const& a, T* b);
template <typename T>
bool operator==(T* a, RefPtr<T> const& b);
template <typename T>
bool operator!=(T* a, RefPtr<T> const& b);
template <typename T, typename U>
bool operator<(RefPtr<T> const& a, RefPtr<U> const& b);
template <typename Type1, typename Type2>
bool is(RefPtr<Type2> const& p);
template <typename Type1, typename Type2>
bool is(RefPtr<Type2 const> const& p);
template <typename Type1, typename Type2>
RefPtr<Type1> as(RefPtr<Type2> const& p);
template <typename Type1, typename Type2>
RefPtr<Type1 const> as(RefPtr<Type2 const> const& p);
template <typename T, typename... Args>
RefPtr<T> make_ref(Args&&... args);
template <typename T>
struct hash<RefPtr<T>> {
size_t operator()(RefPtr<T> const& a) const;
hash<T*> hasher;
};
// Base class for RefPtr that is NOT thread safe. This can have a performance
// benefit over shared_ptr in single threaded contexts.
class RefCounter {
public:
friend void refPtrIncRef(RefCounter* p);
friend void refPtrDecRef(RefCounter* p);
protected:
RefCounter();
virtual ~RefCounter() = default;
private:
size_t m_refCounter;
};
template <typename T>
RefPtr<T>::RefPtr()
: m_ptr(nullptr) {}
template <typename T>
RefPtr<T>::RefPtr(T* p, bool addRef)
: m_ptr(nullptr) {
reset(p, addRef);
}
template <typename T>
RefPtr<T>::RefPtr(RefPtr const& r)
: RefPtr(r.m_ptr) {}
template <typename T>
RefPtr<T>::RefPtr(RefPtr&& r) {
m_ptr = r.m_ptr;
r.m_ptr = nullptr;
}
template <typename T>
template <typename T2>
RefPtr<T>::RefPtr(RefPtr<T2> const& r)
: RefPtr(r.m_ptr) {}
template <typename T>
template <typename T2>
RefPtr<T>::RefPtr(RefPtr<T2>&& r) {
m_ptr = r.m_ptr;
r.m_ptr = nullptr;
}
template <typename T>
RefPtr<T>::~RefPtr() {
if (m_ptr)
refPtrDecRef(m_ptr);
}
template <typename T>
RefPtr<T>& RefPtr<T>::operator=(RefPtr const& r) {
reset(r.m_ptr);
return *this;
}
template <typename T>
RefPtr<T>& RefPtr<T>::operator=(RefPtr&& r) {
if (m_ptr)
refPtrDecRef(m_ptr);
m_ptr = r.m_ptr;
r.m_ptr = nullptr;
return *this;
}
template <typename T>
template <typename T2>
RefPtr<T>& RefPtr<T>::operator=(RefPtr<T2> const& r) {
reset(r.m_ptr);
return *this;
}
template <typename T>
template <typename T2>
RefPtr<T>& RefPtr<T>::operator=(RefPtr<T2>&& r) {
if (m_ptr)
refPtrDecRef(m_ptr);
m_ptr = r.m_ptr;
r.m_ptr = nullptr;
return *this;
}
template <typename T>
void RefPtr<T>::reset() {
reset(nullptr);
}
template <typename T>
void RefPtr<T>::reset(T* r, bool addRef) {
if (m_ptr == r)
return;
if (m_ptr)
refPtrDecRef(m_ptr);
m_ptr = r;
if (m_ptr && addRef)
refPtrIncRef(m_ptr);
}
template <typename T>
T& RefPtr<T>::operator*() const {
return *m_ptr;
}
template <typename T>
T* RefPtr<T>::operator->() const {
return m_ptr;
}
template <typename T>
T* RefPtr<T>::get() const {
return m_ptr;
}
template <typename T>
RefPtr<T>::operator bool() const {
return m_ptr != nullptr;
}
template <typename T, typename U>
bool operator==(RefPtr<T> const& a, RefPtr<U> const& b) {
return a.get() == b.get();
}
template <typename T, typename U>
bool operator!=(RefPtr<T> const& a, RefPtr<U> const& b) {
return a.get() != b.get();
}
template <typename T>
bool operator==(RefPtr<T> const& a, T* b) {
return a.get() == b;
}
template <typename T>
bool operator!=(RefPtr<T> const& a, T* b) {
return a.get() != b;
}
template <typename T>
bool operator==(T* a, RefPtr<T> const& b) {
return a == b.get();
}
template <typename T>
bool operator!=(T* a, RefPtr<T> const& b) {
return a != b.get();
}
template <typename T, typename U>
bool operator<(RefPtr<T> const& a, RefPtr<U> const& b) {
return a.get() < b.get();
}
template <typename Type1, typename Type2>
bool is(RefPtr<Type2> const& p) {
return (bool)dynamic_cast<Type1*>(p.get());
}
template <typename Type1, typename Type2>
bool is(RefPtr<Type2 const> const& p) {
return (bool)dynamic_cast<Type1 const*>(p.get());
}
template <typename Type1, typename Type2>
RefPtr<Type1> as(RefPtr<Type2> const& p) {
return RefPtr<Type1>(dynamic_cast<Type1*>(p.get()));
}
template <typename Type1, typename Type2>
RefPtr<Type1 const> as(RefPtr<Type2 const> const& p) {
return RefPtr<Type1>(dynamic_cast<Type1 const*>(p.get()));
}
template <typename T, typename... Args>
RefPtr<T> make_ref(Args&&... args) {
return RefPtr<T>(new T(std::forward<Args>(args)...));
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}
template <typename T>
size_t hash<RefPtr<T>>::operator()(RefPtr<T> const& a) const {
return hasher(a.get());
}
inline void refPtrIncRef(RefCounter* p) {
++p->m_refCounter;
}
inline void refPtrDecRef(RefCounter* p) {
if (--p->m_refCounter == 0)
delete p;
}
inline RefCounter::RefCounter()
: m_refCounter(0) {}
}
#endif