/*
 *  Copyright 2016 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_REFCOUNTEDOBJECT_H_
#define RTC_BASE_REFCOUNTEDOBJECT_H_

#include <utility>

#include "rtc_base/constructormagic.h"
#include "rtc_base/refcount.h"
#include "rtc_base/refcounter.h"

namespace rtc
{

template <class T>
class RefCountedObject : public T
{
public:
    RefCountedObject() {}

    template <class P0>
    explicit RefCountedObject(P0&& p0)
        : T(std::forward<P0>(p0))
    {
    }

    template <class P0, class P1, class... Args>
    RefCountedObject(P0&& p0, P1&& p1, Args&&... args)
        : T(std::forward<P0>(p0),
            std::forward<P1>(p1),
            std::forward<Args>(args)...)
    {
    }

    virtual void AddRef() const { ref_count_.IncRef(); }

    virtual RefCountReleaseStatus Release() const
    {
        const auto status = ref_count_.DecRef();
        if (status == RefCountReleaseStatus::kDroppedLastRef)
        {
            delete this;
        }
        return status;
    }

    // Return whether the reference count is one. If the reference count is used
    // in the conventional way, a reference count of 1 implies that the current
    // thread owns the reference and no other thread shares it. This call
    // performs the test for a reference count of one, and performs the memory
    // barrier needed for the owning thread to act on the object, knowing that it
    // has exclusive access to the object.
    virtual bool HasOneRef() const { return ref_count_.HasOneRef(); }

protected:
    virtual ~RefCountedObject() {}

    mutable webrtc::webrtc_impl::RefCounter ref_count_ {0};

    RTC_DISALLOW_COPY_AND_ASSIGN(RefCountedObject);
};

} // namespace rtc

#endif // RTC_BASE_REFCOUNTEDOBJECT_H_