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https://github.com/SerenityOS/serenity
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c2a900b853
These instances were detected by searching for files that include AK/StdLibExtras.h, but don't match the regex: \\b(abs|AK_REPLACED_STD_NAMESPACE|array_size|ceil_div|clamp|exchange|for ward|is_constant_evaluated|is_power_of_two|max|min|mix|move|_RawPtr|RawP tr|round_up_to_power_of_two|swap|to_underlying)\\b (Without the linebreaks.) This regex is pessimistic, so there might be more files that don't actually use any "extra stdlib" functions. In theory, one might use LibCPP to detect things like this automatically, but let's do this one step after another.
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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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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