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Side by Side Diff: base/lazy_instance.h

Issue 1992005: Update dynamic annotations and move them to base/third_party (Closed)
Patch Set: rebased Created 10 years, 7 months ago
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1 // Copyright (c) 2008 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2008 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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30 // 30 //
31 // MyClass* ptr = my_instance.Pointer(); 31 // MyClass* ptr = my_instance.Pointer();
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 37
38 #include "base/atomicops.h" 38 #include "base/atomicops.h"
39 #include "base/basictypes.h" 39 #include "base/basictypes.h"
40 #include "base/dynamic_annotations.h" 40 #include "base/third_party/dynamic_annotations/dynamic_annotations.h"
41 41
42 namespace base { 42 namespace base {
43 43
44 template <typename Type> 44 template <typename Type>
45 struct DefaultLazyInstanceTraits { 45 struct DefaultLazyInstanceTraits {
46 static Type* New(void* instance) { 46 static Type* New(void* instance) {
47 // Use placement new to initialize our instance in our preallocated space. 47 // Use placement new to initialize our instance in our preallocated space.
48 // The parenthesis is very important here to force POD type initialization. 48 // The parenthesis is very important here to force POD type initialization.
49 return new (instance) Type(); 49 return new (instance) Type();
50 } 50 }
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120 private: 120 private:
121 int8 buf_[sizeof(Type)]; // Preallocate the space for the Type instance. 121 int8 buf_[sizeof(Type)]; // Preallocate the space for the Type instance.
122 Type *instance_; 122 Type *instance_;
123 123
124 DISALLOW_COPY_AND_ASSIGN(LazyInstance); 124 DISALLOW_COPY_AND_ASSIGN(LazyInstance);
125 }; 125 };
126 126
127 } // namespace base 127 } // namespace base
128 128
129 #endif // BASE_LAZY_INSTANCE_H_ 129 #endif // BASE_LAZY_INSTANCE_H_
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