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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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