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AK: Rename Retainable.h => RefCounted.h.
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31 changed files with 30 additions and 30 deletions
78
AK/RefCounted.h
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78
AK/RefCounted.h
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#pragma once
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#include "Assertions.h"
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#include "StdLibExtras.h"
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namespace AK {
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template<class T>
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constexpr auto call_will_be_destroyed_if_present(T* object) -> decltype(object->will_be_destroyed(), TrueType {})
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{
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object->will_be_destroyed();
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return {};
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}
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constexpr auto call_will_be_destroyed_if_present(...) -> FalseType
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{
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return {};
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}
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template<class T>
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constexpr auto call_one_ref_left_if_present(T* object) -> decltype(object->one_ref_left(), TrueType {})
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{
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object->one_ref_left();
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return {};
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}
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constexpr auto call_one_ref_left_if_present(...) -> FalseType
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{
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return {};
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}
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class RefCountedBase {
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public:
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void ref()
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{
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ASSERT(m_ref_count);
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++m_ref_count;
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}
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int ref_count() const
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{
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return m_ref_count;
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}
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protected:
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RefCountedBase() {}
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~RefCountedBase()
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{
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ASSERT(!m_ref_count);
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}
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void deref_base()
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{
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ASSERT(m_ref_count);
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--m_ref_count;
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}
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int m_ref_count { 1 };
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};
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template<typename T>
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class RefCounted : public RefCountedBase {
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public:
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void deref()
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{
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deref_base();
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if (m_ref_count == 0) {
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call_will_be_destroyed_if_present(static_cast<T*>(this));
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delete static_cast<T*>(this);
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} else if (m_ref_count == 1) {
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call_one_ref_left_if_present(static_cast<T*>(this));
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}
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}
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};
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}
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using AK::RefCounted;
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