| // Copyright (c) 2011 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_ENUM_VARIANT_H_ |
| #define BASE_WIN_ENUM_VARIANT_H_ |
| |
| #include <unknwn.h> |
| |
| #include "base/memory/scoped_ptr.h" |
| #include "base/win/iunknown_impl.h" |
| |
| namespace base { |
| namespace win { |
| |
| // A simple implementation of IEnumVARIANT. |
| class BASE_EXPORT EnumVariant |
| : public IEnumVARIANT, |
| public IUnknownImpl { |
| public: |
| // The constructor allocates an array of size |count|. Then use |
| // ItemAt to set the value of each item in the array to initialize it. |
| explicit EnumVariant(unsigned long count); |
| |
| // Returns a mutable pointer to the item at position |index|. |
| VARIANT* ItemAt(unsigned long index); |
| |
| // IUnknown. |
| ULONG STDMETHODCALLTYPE AddRef() OVERRIDE; |
| ULONG STDMETHODCALLTYPE Release() OVERRIDE; |
| STDMETHODIMP QueryInterface(REFIID riid, void** ppv) OVERRIDE; |
| |
| // IEnumVARIANT. |
| STDMETHODIMP Next(ULONG requested_count, |
| VARIANT* out_elements, |
| ULONG* out_elements_received); |
| STDMETHODIMP Skip(ULONG skip_count); |
| STDMETHODIMP Reset(); |
| STDMETHODIMP Clone(IEnumVARIANT** out_cloned_object); |
| |
| private: |
| ~EnumVariant(); |
| |
| scoped_array<VARIANT> items_; |
| unsigned long count_; |
| unsigned long current_index_; |
| }; |
| |
| } // namespace win |
| } // namespace base |
| |
| #endif // BASE_WIN_ENUM_VARIANT_H_ |