File: iunknown_impl.h

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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef BASE_WIN_IUNKNOWN_IMPL_H_
#define BASE_WIN_IUNKNOWN_IMPL_H_

#include <unknwn.h>

#include "base/atomic_ref_count.h"
#include "base/base_export.h"
#include "base/compiler_specific.h"

namespace base {
namespace win {

// IUnknown implementation for other classes to derive from.
class BASE_EXPORT IUnknownImpl : public IUnknown {
 public:
  IUnknownImpl();

  virtual ULONG STDMETHODCALLTYPE AddRef() OVERRIDE;
  virtual ULONG STDMETHODCALLTYPE Release() OVERRIDE;

  // Subclasses should extend this to return any interfaces they provide.
  virtual STDMETHODIMP QueryInterface(REFIID riid, void** ppv) OVERRIDE;

 protected:
  virtual ~IUnknownImpl();

 private:
  AtomicRefCount ref_count_;
};

}  // namespace win
}  // namespace base

#endif  // BASE_WIN_IUNKNOWN_IMPL_H_