50 lines
1.3 KiB
C++
50 lines
1.3 KiB
C++
// Copyright 2011 The Chromium Authors
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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 <wrl/implements.h>
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#include <memory>
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#include <vector>
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#include "base/win/scoped_variant.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 Microsoft::WRL::RuntimeClass<
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Microsoft::WRL::RuntimeClassFlags<Microsoft::WRL::ClassicCom>,
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IEnumVARIANT> {
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public:
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// The constructor allocates a vector of empty ScopedVariants of size |count|.
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// Use ItemAt to set the value of each item in the array.
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explicit EnumVariant(ULONG count);
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// IEnumVARIANT:
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IFACEMETHODIMP Next(ULONG requested_count,
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VARIANT* out_elements,
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ULONG* out_elements_received) override;
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IFACEMETHODIMP Skip(ULONG skip_count) override;
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IFACEMETHODIMP Reset() override;
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IFACEMETHODIMP Clone(IEnumVARIANT** out_cloned_object) override;
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// Returns a mutable pointer to the item at position |index|.
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VARIANT* ItemAt(ULONG index);
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private:
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~EnumVariant() override;
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std::vector<ScopedVariant> items_;
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ULONG 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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