1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef BASE_WIN_IUNKNOWN_IMPL_H_ 6 #define BASE_WIN_IUNKNOWN_IMPL_H_ 7 8 #include <unknwn.h> 9 10 #include "base/atomic_ref_count.h" 11 #include "base/base_export.h" 12 #include "base/compiler_specific.h" 13 14 namespace base { 15 namespace win { 16 17 // IUnknown implementation for other classes to derive from. 18 class BASE_EXPORT IUnknownImpl : public IUnknown { 19 public: 20 IUnknownImpl(); 21 22 virtual ULONG STDMETHODCALLTYPE AddRef() OVERRIDE; 23 virtual ULONG STDMETHODCALLTYPE Release() OVERRIDE; 24 25 // Subclasses should extend this to return any interfaces they provide. 26 virtual STDMETHODIMP QueryInterface(REFIID riid, void** ppv) OVERRIDE; 27 28 protected: 29 virtual ~IUnknownImpl(); 30 31 private: 32 AtomicRefCount ref_count_; 33 }; 34 35 } // namespace win 36 } // namespace base 37 38 #endif // BASE_WIN_IUNKNOWN_IMPL_H_ 39