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150 lines
3.2 KiB
C++
150 lines
3.2 KiB
C++
// This code is in the public domain -- Ignacio Castaño <castano@gmail.com>
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#ifndef NV_CORE_REFCOUNTED_H
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#define NV_CORE_REFCOUNTED_H
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#include "nvcore.h"
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#include "Debug.h"
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#define NV_DECLARE_PTR(Class) \
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template <class T> class SmartPtr; \
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typedef SmartPtr<class Class> Class ## Ptr; \
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typedef SmartPtr<const class Class> Class ## ConstPtr
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namespace nv
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{
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/// Weak proxy.
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class WeakProxy
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{
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NV_FORBID_COPY(WeakProxy);
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public:
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/// Ctor.
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WeakProxy(void * ptr) : m_count(0), m_ptr(ptr) { }
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/// Dtor.
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~WeakProxy()
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{
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nvCheck( m_count == 0 );
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}
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/// Increase reference count.
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uint addRef() const
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{
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m_count++;
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return m_count;
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}
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/// Decrease reference count and remove when 0.
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uint release() const
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{
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nvCheck( m_count > 0 );
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m_count--;
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if( m_count == 0 ) {
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delete this;
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return 0;
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}
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return m_count;
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}
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/// WeakPtr's call this to determine if their pointer is valid or not.
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bool isAlive() const {
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return m_ptr != NULL;
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}
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/// Only the actual object should call this.
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void notifyObjectDied() {
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m_ptr = NULL;
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}
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/// Return proxy pointer.
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void * ptr() const {
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return m_ptr;
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}
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private:
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mutable int m_count;
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void * m_ptr;
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};
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/// Reference counted base class to be used with SmartPtr and WeakPtr.
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class RefCounted
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{
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NV_FORBID_COPY(RefCounted);
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public:
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/// Ctor.
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RefCounted() : m_count(0), m_weak_proxy(NULL)
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{
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}
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/// Virtual dtor.
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virtual ~RefCounted()
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{
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nvCheck( m_count == 0 );
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releaseWeakProxy();
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}
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/// Increase reference count.
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uint addRef() const
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{
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m_count++;
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return m_count;
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}
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/// Decrease reference count and remove when 0.
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uint release() const
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{
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nvCheck( m_count > 0 );
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m_count--;
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if( m_count == 0 ) {
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delete this;
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return 0;
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}
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return m_count;
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}
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/// Get weak proxy.
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WeakProxy * getWeakProxy() const
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{
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if (m_weak_proxy == NULL) {
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m_weak_proxy = new WeakProxy((void *)this);
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m_weak_proxy->addRef();
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}
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return m_weak_proxy;
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}
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/// Release the weak proxy.
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void releaseWeakProxy() const
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{
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if (m_weak_proxy != NULL) {
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m_weak_proxy->notifyObjectDied();
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m_weak_proxy->release();
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m_weak_proxy = NULL;
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}
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}
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/// Get reference count.
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int refCount() const
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{
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return m_count;
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}
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private:
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mutable int m_count;
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mutable WeakProxy * m_weak_proxy;
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};
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} // nv namespace
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#endif // NV_CORE_REFCOUNTED_H
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