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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef BASE_WIN_SCOPED_VARIANT_H_ | 5 #ifndef BASE_WIN_SCOPED_VARIANT_H_ |
6 #define BASE_WIN_SCOPED_VARIANT_H_ | 6 #define BASE_WIN_SCOPED_VARIANT_H_ |
7 #pragma once | 7 #pragma once |
8 | 8 |
9 #include <windows.h> | 9 #include <windows.h> |
10 #include <oleauto.h> | 10 #include <oleauto.h> |
11 | 11 |
12 #include "base/base_api.h" | 12 #include "base/base_export.h" |
13 #include "base/basictypes.h" | 13 #include "base/basictypes.h" |
14 | 14 |
15 namespace base { | 15 namespace base { |
16 namespace win { | 16 namespace win { |
17 | 17 |
18 // Scoped VARIANT class for automatically freeing a COM VARIANT at the | 18 // Scoped VARIANT class for automatically freeing a COM VARIANT at the |
19 // end of a scope. Additionally provides a few functions to make the | 19 // end of a scope. Additionally provides a few functions to make the |
20 // encapsulated VARIANT easier to use. | 20 // encapsulated VARIANT easier to use. |
21 // Instead of inheriting from VARIANT, we take the containment approach | 21 // Instead of inheriting from VARIANT, we take the containment approach |
22 // in order to have more control over the usage of the variant and guard | 22 // in order to have more control over the usage of the variant and guard |
23 // against memory leaks. | 23 // against memory leaks. |
24 class BASE_API ScopedVariant { | 24 class BASE_EXPORT ScopedVariant { |
25 public: | 25 public: |
26 // Declaration of a global variant variable that's always VT_EMPTY | 26 // Declaration of a global variant variable that's always VT_EMPTY |
27 static const VARIANT kEmptyVariant; | 27 static const VARIANT kEmptyVariant; |
28 | 28 |
29 // Default constructor. | 29 // Default constructor. |
30 ScopedVariant() { | 30 ScopedVariant() { |
31 // This is equivalent to what VariantInit does, but less code. | 31 // This is equivalent to what VariantInit does, but less code. |
32 var_.vt = VT_EMPTY; | 32 var_.vt = VT_EMPTY; |
33 } | 33 } |
34 | 34 |
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158 // Use the Compare method instead. | 158 // Use the Compare method instead. |
159 bool operator==(const ScopedVariant& var) const; | 159 bool operator==(const ScopedVariant& var) const; |
160 bool operator!=(const ScopedVariant& var) const; | 160 bool operator!=(const ScopedVariant& var) const; |
161 DISALLOW_COPY_AND_ASSIGN(ScopedVariant); | 161 DISALLOW_COPY_AND_ASSIGN(ScopedVariant); |
162 }; | 162 }; |
163 | 163 |
164 } // namespace win | 164 } // namespace win |
165 } // namesoace base | 165 } // namesoace base |
166 | 166 |
167 #endif // BASE_WIN_SCOPED_VARIANT_H_ | 167 #endif // BASE_WIN_SCOPED_VARIANT_H_ |
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