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Add WeakPtr/Weakable templates.
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4 changed files with 109 additions and 2 deletions
45
AK/Weakable.h
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45
AK/Weakable.h
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#pragma once
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#include "Assertions.h"
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#include "Retainable.h"
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namespace AK {
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template<typename T> class Weakable;
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template<typename T> class WeakPtr;
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template<typename T>
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class WeakLink : public Retainable<WeakLink<T>> {
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friend class Weakable<T>;
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public:
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T* ptr() { return static_cast<T*>(m_ptr); }
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const T* ptr() const { return static_cast<const T*>(m_ptr); }
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private:
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explicit WeakLink(Weakable<T>& weakable) : m_ptr(&weakable) { }
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Weakable<T>* m_ptr;
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};
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template<typename T>
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class Weakable {
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private:
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class Link;
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public:
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WeakPtr<T> makeWeakPtr();
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protected:
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Weakable() { }
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~Weakable()
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{
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if (m_link)
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m_link->m_ptr = nullptr;
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}
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private:
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RetainPtr<WeakLink<T>> m_link;
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};
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}
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using AK::Weakable;
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