1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
base / win / enum_variant.h [blame]
// Copyright 2011 The Chromium Authors
// 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_