1 // Copyright (c) 2011 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.
5 #ifndef BASE_WIN_ENUM_VARIANT_H_
6 #define BASE_WIN_ENUM_VARIANT_H_
10 #include "base/memory/scoped_ptr.h"
11 #include "base/win/iunknown_impl.h"
16 // A simple implementation of IEnumVARIANT.
17 class BASE_EXPORT EnumVariant
18 : public IEnumVARIANT,
21 // The constructor allocates an array of size |count|. Then use
22 // ItemAt to set the value of each item in the array to initialize it.
23 explicit EnumVariant(unsigned long count);
25 // Returns a mutable pointer to the item at position |index|.
26 VARIANT* ItemAt(unsigned long index);
29 ULONG STDMETHODCALLTYPE AddRef() OVERRIDE;
30 ULONG STDMETHODCALLTYPE Release() OVERRIDE;
31 STDMETHODIMP QueryInterface(REFIID riid, void** ppv) OVERRIDE;
34 STDMETHODIMP Next(ULONG requested_count,
35 VARIANT* out_elements,
36 ULONG* out_elements_received);
37 STDMETHODIMP Skip(ULONG skip_count);
39 STDMETHODIMP Clone(IEnumVARIANT** out_cloned_object);
44 scoped_ptr<VARIANT[]> items_;
46 unsigned long current_index_;
52 #endif // BASE_WIN_ENUM_VARIANT_H_