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54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_WIN_ENUM_VARIANT_H_
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#define BASE_WIN_ENUM_VARIANT_H_
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#include <unknwn.h>
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#include <memory>
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#include "base/win/iunknown_impl.h"
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namespace base {
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namespace win {
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// A simple implementation of IEnumVARIANT.
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class BASE_EXPORT EnumVariant
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: public IEnumVARIANT,
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public IUnknownImpl {
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public:
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// The constructor allocates an array of size |count|. Then use
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// ItemAt to set the value of each item in the array to initialize it.
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explicit EnumVariant(unsigned long count);
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// Returns a mutable pointer to the item at position |index|.
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VARIANT* ItemAt(unsigned long index);
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// IUnknown.
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ULONG STDMETHODCALLTYPE AddRef() override;
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ULONG STDMETHODCALLTYPE Release() override;
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STDMETHODIMP QueryInterface(REFIID riid, void** ppv) override;
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// IEnumVARIANT.
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STDMETHODIMP Next(ULONG requested_count,
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VARIANT* out_elements,
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ULONG* out_elements_received) override;
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STDMETHODIMP Skip(ULONG skip_count) override;
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STDMETHODIMP Reset() override;
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STDMETHODIMP Clone(IEnumVARIANT** out_cloned_object) override;
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private:
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~EnumVariant() override;
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std::unique_ptr<VARIANT[]> items_;
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unsigned long count_;
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unsigned long current_index_;
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};
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} // namespace win
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} // namespace base
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#endif // BASE_WIN_ENUM_VARIANT_H_
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