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Side by Side Diff: base/lazy_instance.h

Issue 7461141: Rename BASE_API to BASE_EXPORT. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src/
Patch Set: '' Created 9 years, 4 months ago
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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 // The LazyInstance<Type, Traits> class manages a single instance of Type, 5 // The LazyInstance<Type, Traits> class manages a single instance of Type,
6 // which will be lazily created on the first time it's accessed. This class is 6 // which will be lazily created on the first time it's accessed. This class is
7 // useful for places you would normally use a function-level static, but you 7 // useful for places you would normally use a function-level static, but you
8 // need to have guaranteed thread-safety. The Type constructor will only ever 8 // need to have guaranteed thread-safety. The Type constructor will only ever
9 // be called once, even if two threads are racing to create the object. Get() 9 // be called once, even if two threads are racing to create the object. Get()
10 // and Pointer() will always return the same, completely initialized instance. 10 // and Pointer() will always return the same, completely initialized instance.
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32 // ptr->DoDoDo(); // MyClass::DoDoDo 32 // ptr->DoDoDo(); // MyClass::DoDoDo
33 // } 33 // }
34 34
35 #ifndef BASE_LAZY_INSTANCE_H_ 35 #ifndef BASE_LAZY_INSTANCE_H_
36 #define BASE_LAZY_INSTANCE_H_ 36 #define BASE_LAZY_INSTANCE_H_
37 #pragma once 37 #pragma once
38 38
39 #include <new> // For placement new. 39 #include <new> // For placement new.
40 40
41 #include "base/atomicops.h" 41 #include "base/atomicops.h"
42 #include "base/base_api.h" 42 #include "base/base_export.h"
43 #include "base/basictypes.h" 43 #include "base/basictypes.h"
44 #include "base/third_party/dynamic_annotations/dynamic_annotations.h" 44 #include "base/third_party/dynamic_annotations/dynamic_annotations.h"
45 #include "base/threading/thread_restrictions.h" 45 #include "base/threading/thread_restrictions.h"
46 46
47 namespace base { 47 namespace base {
48 48
49 template <typename Type> 49 template <typename Type>
50 struct DefaultLazyInstanceTraits { 50 struct DefaultLazyInstanceTraits {
51 static const bool kAllowedToAccessOnNonjoinableThread = false; 51 static const bool kAllowedToAccessOnNonjoinableThread = false;
52 52
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74 // LeakyLazyInstanceTraits in contexts where you don't have an 74 // LeakyLazyInstanceTraits in contexts where you don't have an
75 // AtExitManager. 75 // AtExitManager.
76 static void (*Delete)(void* instance); 76 static void (*Delete)(void* instance);
77 }; 77 };
78 78
79 template <typename Type> 79 template <typename Type>
80 void (*LeakyLazyInstanceTraits<Type>::Delete)(void* instance) = NULL; 80 void (*LeakyLazyInstanceTraits<Type>::Delete)(void* instance) = NULL;
81 81
82 // We pull out some of the functionality into a non-templated base, so that we 82 // We pull out some of the functionality into a non-templated base, so that we
83 // can implement the more complicated pieces out of line in the .cc file. 83 // can implement the more complicated pieces out of line in the .cc file.
84 class BASE_API LazyInstanceHelper { 84 class BASE_EXPORT LazyInstanceHelper {
85 protected: 85 protected:
86 enum { 86 enum {
87 STATE_EMPTY = 0, 87 STATE_EMPTY = 0,
88 STATE_CREATING = 1, 88 STATE_CREATING = 1,
89 STATE_CREATED = 2 89 STATE_CREATED = 2
90 }; 90 };
91 91
92 explicit LazyInstanceHelper(LinkerInitialized /*unused*/) {/* state_ is 0 */} 92 explicit LazyInstanceHelper(LinkerInitialized /*unused*/) {/* state_ is 0 */}
93 93
94 // Declaring a destructor (even if it's empty) will cause MSVC to register a 94 // Declaring a destructor (even if it's empty) will cause MSVC to register a
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188 188
189 int8 buf_[sizeof(Type)]; // Preallocate the space for the Type instance. 189 int8 buf_[sizeof(Type)]; // Preallocate the space for the Type instance.
190 Type *instance_; 190 Type *instance_;
191 191
192 DISALLOW_COPY_AND_ASSIGN(LazyInstance); 192 DISALLOW_COPY_AND_ASSIGN(LazyInstance);
193 }; 193 };
194 194
195 } // namespace base 195 } // namespace base
196 196
197 #endif // BASE_LAZY_INSTANCE_H_ 197 #endif // BASE_LAZY_INSTANCE_H_
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