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Side by Side Diff: base/win/scoped_variant.h

Issue 6747014: Base: Last set of files to use BASE_API (for base.dll) (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src/
Patch Set: Created 9 years, 9 months ago
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1 // Copyright (c) 2010 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/basictypes.h" 13 #include "base/basictypes.h"
13 14
14 namespace base { 15 namespace base {
15 namespace win { 16 namespace win {
16 17
17 // Scoped VARIANT class for automatically freeing a COM VARIANT at the 18 // Scoped VARIANT class for automatically freeing a COM VARIANT at the
18 // 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
19 // encapsulated VARIANT easier to use. 20 // encapsulated VARIANT easier to use.
20 // Instead of inheriting from VARIANT, we take the containment approach 21 // Instead of inheriting from VARIANT, we take the containment approach
21 // 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
22 // against memory leaks. 23 // against memory leaks.
23 class ScopedVariant { 24 class BASE_API ScopedVariant {
24 public: 25 public:
25 // Declaration of a global variant variable that's always VT_EMPTY 26 // Declaration of a global variant variable that's always VT_EMPTY
26 static const VARIANT kEmptyVariant; 27 static const VARIANT kEmptyVariant;
27 28
28 // Default constructor. 29 // Default constructor.
29 ScopedVariant() { 30 ScopedVariant() {
30 // This is equivalent to what VariantInit does, but less code. 31 // This is equivalent to what VariantInit does, but less code.
31 var_.vt = VT_EMPTY; 32 var_.vt = VT_EMPTY;
32 } 33 }
33 34
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157 // Use the Compare method instead. 158 // Use the Compare method instead.
158 bool operator==(const ScopedVariant& var) const; 159 bool operator==(const ScopedVariant& var) const;
159 bool operator!=(const ScopedVariant& var) const; 160 bool operator!=(const ScopedVariant& var) const;
160 DISALLOW_COPY_AND_ASSIGN(ScopedVariant); 161 DISALLOW_COPY_AND_ASSIGN(ScopedVariant);
161 }; 162 };
162 163
163 } // namespace win 164 } // namespace win
164 } // namesoace base 165 } // namesoace base
165 166
166 #endif // BASE_WIN_SCOPED_VARIANT_H_ 167 #endif // BASE_WIN_SCOPED_VARIANT_H_
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