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/*
* Copyright 2011 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef RTC_BASE_REF_COUNT_H_
#define RTC_BASE_REF_COUNT_H_
namespace rtc {
// Refcounted objects should implement the following informal interface:
//
// void AddRef() const ;
// RefCountReleaseStatus Release() const;
//
// You may access members of a reference-counted object, including the AddRef()
// and Release() methods, only if you already own a reference to it, or if
// you're borrowing someone else's reference. (A newly created object is a
// special case: the reference count is zero on construction, and the code that
// creates the object should immediately call AddRef(), bringing the reference
// count from zero to one, e.g., by constructing an rtc::scoped_refptr).
//
// AddRef() creates a new reference to the object.
//
// Release() releases a reference to the object; the caller now has one less
// reference than before the call. Returns kDroppedLastRef if the number of
// references dropped to zero because of this (in which case the object destroys
// itself). Otherwise, returns kOtherRefsRemained, to signal that at the precise
// time the caller's reference was dropped, other references still remained (but
// if other threads own references, this may of course have changed by the time
// Release() returns).
//
// The caller of Release() must treat it in the same way as a delete operation:
// Regardless of the return value from Release(), the caller mustn't access the
// object. The object might still be alive, due to references held by other
// users of the object, but the object can go away at any time, e.g., as the
// result of another thread calling Release().
//
// Calling AddRef() and Release() manually is discouraged. It's recommended to
// use rtc::scoped_refptr to manage all pointers to reference counted objects.
// Note that rtc::scoped_refptr depends on compile-time duck-typing; formally
// implementing the below RefCountInterface is not required.
enum class RefCountReleaseStatus { kDroppedLastRef, kOtherRefsRemained };
// Interfaces where refcounting is part of the public api should
// inherit this abstract interface. The implementation of these
// methods is usually provided by the RefCountedObject template class,
// applied as a leaf in the inheritance tree.
class RefCountInterface {
public:
virtual void AddRef() const = 0;
virtual RefCountReleaseStatus Release() const = 0;
// Non-public destructor, because Release() has exclusive responsibility for
// destroying the object.
protected:
virtual ~RefCountInterface() {}
};
} // namespace rtc
#endif // RTC_BASE_REF_COUNT_H_
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