// Copyright © 2021 The CefSharp Authors. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
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#ifndef CEFSHARP_CORE_CEFREFCOUNTEDMANAGED_H
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#define CEFSHARP_CORE_CEFREFCOUNTEDMANAGED_H
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#pragma once
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#include <winnt.h>
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#include "include\base\cef_macros.h"
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class CefRefCountManaged
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{
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public:
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CefRefCountManaged() : ref_count_(0)
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{
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}
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///
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// Increment the reference count.
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///
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void AddRef() const
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{
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InterlockedIncrement(&ref_count_);
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}
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///
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// Decrement the reference count. Returns true if the reference count is 0.
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///
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bool Release() const
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{
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LONG res = InterlockedDecrement(&ref_count_);
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return res == 0;
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}
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///
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// Returns true if the reference count is 1.
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///
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bool HasOneRef() const
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{
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LONG res = InterlockedCompareExchange(&ref_count_, 0, 0);
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return res == 1;
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}
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///
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// Returns true if the reference count is at least 1.
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///
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bool HasAtLeastOneRef() const
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{
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LONG res = InterlockedCompareExchange(&ref_count_, 0, 0);
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return res > 0;
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}
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private:
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mutable volatile LONG ref_count_;
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DISALLOW_COPY_AND_ASSIGN(CefRefCountManaged);
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};
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///
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// Macro that provides a reference counting implementation for classes extending
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// CefBase.
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///
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#define IMPLEMENT_REFCOUNTINGM(ClassName) \
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public: \
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void AddRef() const override { ref_count_.AddRef(); } \
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bool Release() const override { \
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if (ref_count_.Release()) { \
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delete static_cast<const ClassName*>(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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bool HasOneRef() const override { return ref_count_.HasOneRef(); } \
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bool HasAtLeastOneRef() const override { \
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return ref_count_.HasAtLeastOneRef(); \
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} \
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\
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private: \
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CefRefCountManaged ref_count_
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#endif // CEFSHARP_CORE_CEFREFCOUNTEDMANAGED_H
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