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// 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 <wrl/implements.h>
#include <memory>
#include <vector>
#include "base/win/scoped_variant.h"
namespace base {
namespace win {
// A simple implementation of IEnumVARIANT.
class BASE_EXPORT EnumVariant
: public Microsoft::WRL::RuntimeClass<
Microsoft::WRL::RuntimeClassFlags<Microsoft::WRL::ClassicCom>,
IEnumVARIANT> {
public:
// The constructor allocates a vector of empty ScopedVariants of size |count|.
// Use ItemAt to set the value of each item in the array.
explicit EnumVariant(ULONG count);
// IEnumVARIANT:
IFACEMETHODIMP Next(ULONG requested_count,
VARIANT* out_elements,
ULONG* out_elements_received) override;
IFACEMETHODIMP Skip(ULONG skip_count) override;
IFACEMETHODIMP Reset() override;
IFACEMETHODIMP Clone(IEnumVARIANT** out_cloned_object) override;
// Returns a mutable pointer to the item at position |index|.
VARIANT* ItemAt(ULONG index);
private:
~EnumVariant() override;
std::vector<ScopedVariant> items_;
ULONG current_index_;
};
} // namespace win
} // namespace base
#endif // BASE_WIN_ENUM_VARIANT_H_
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