150 lines
5.0 KiB
C++
150 lines
5.0 KiB
C++
// Copyright (c) 2012 Marshall A. Greenblatt. All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the name Chromium Embedded
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// Framework nor the names of its contributors may be used to endorse
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// or promote products derived from this software without specific prior
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// written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef CEF_INCLUDE_CEF_BASE_H_
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#define CEF_INCLUDE_CEF_BASE_H_
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#pragma once
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#include "include/base/cef_atomic_ref_count.h"
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#include "include/base/cef_build.h"
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#include "include/base/cef_macros.h"
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// Bring in common C++ type definitions used by CEF consumers.
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#include "include/internal/cef_ptr.h"
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#include "include/internal/cef_time_wrappers.h"
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#include "include/internal/cef_types_wrappers.h"
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#if defined(OS_WIN)
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#include "include/internal/cef_win.h"
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#elif defined(OS_MAC)
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#include "include/internal/cef_mac.h"
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#elif defined(OS_LINUX)
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#include "include/internal/cef_linux.h"
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#endif
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///
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/// All ref-counted framework classes must extend this class.
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///
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class CefBaseRefCounted {
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public:
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///
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/// Called to increment the reference count for the object. Should be called
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/// for every new copy of a pointer to a given object.
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///
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virtual void AddRef() const = 0;
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///
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/// Called to decrement the reference count for the object. Returns true if
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/// the reference count is 0, in which case the object should self-delete.
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///
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virtual bool Release() const = 0;
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///
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/// Returns true if the reference count is 1.
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///
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virtual bool HasOneRef() const = 0;
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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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virtual bool HasAtLeastOneRef() const = 0;
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protected:
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virtual ~CefBaseRefCounted() {}
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};
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///
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/// All scoped framework classes must extend this class.
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///
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class CefBaseScoped {
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public:
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virtual ~CefBaseScoped() {}
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};
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///
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/// Class that implements atomic reference counting.
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///
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class CefRefCount {
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public:
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CefRefCount() = default;
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CefRefCount(const CefRefCount&) = delete;
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CefRefCount& operator=(const CefRefCount&) = delete;
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///
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/// Increment the reference count.
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///
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void AddRef() const { ref_count_.Increment(); }
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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 { return !ref_count_.Decrement(); }
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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 { return ref_count_.IsOne(); }
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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 { return !ref_count_.IsZero(); }
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private:
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mutable base::AtomicRefCount ref_count_{0};
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};
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///
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/// Macro that provides a reference counting implementation for classes
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/// extending CefBase.
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///
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#define IMPLEMENT_REFCOUNTING(ClassName) \
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public: \
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void AddRef() const override { \
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ref_count_.AddRef(); \
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} \
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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 { \
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return ref_count_.HasOneRef(); \
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} \
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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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CefRefCount ref_count_
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#endif // CEF_INCLUDE_CEF_BASE_H_
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