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ae3ffdd521
This patch adds the `USING_AK_GLOBALLY` macro which is enabled by default, but can be overridden by build flags. This is a step towards integrating Jakt and AK types.
78 lines
1.6 KiB
C++
78 lines
1.6 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Assertions.h>
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#include <AK/Checked.h>
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#include <AK/Noncopyable.h>
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#include <AK/Platform.h>
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#include <AK/StdLibExtras.h>
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namespace AK {
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class RefCountedBase {
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AK_MAKE_NONCOPYABLE(RefCountedBase);
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AK_MAKE_NONMOVABLE(RefCountedBase);
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public:
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using RefCountType = unsigned int;
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using AllowOwnPtr = FalseType;
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ALWAYS_INLINE void ref() const
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{
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VERIFY(m_ref_count > 0);
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VERIFY(!Checked<RefCountType>::addition_would_overflow(m_ref_count, 1));
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++m_ref_count;
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}
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[[nodiscard]] bool try_ref() const
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{
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if (m_ref_count == 0)
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return false;
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ref();
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return true;
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}
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[[nodiscard]] RefCountType ref_count() const { return m_ref_count; }
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protected:
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RefCountedBase() = default;
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~RefCountedBase() { VERIFY(!m_ref_count); }
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ALWAYS_INLINE RefCountType deref_base() const
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{
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VERIFY(m_ref_count);
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return --m_ref_count;
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}
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RefCountType mutable 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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bool unref() const
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{
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auto* that = const_cast<T*>(static_cast<T const*>(this));
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auto new_ref_count = deref_base();
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if (new_ref_count == 0) {
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if constexpr (requires { that->will_be_destroyed(); })
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that->will_be_destroyed();
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delete static_cast<T const*>(this);
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return true;
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}
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return false;
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}
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};
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}
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#if USING_AK_GLOBALLY
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using AK::RefCounted;
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using AK::RefCountedBase;
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#endif
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