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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 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 // ManualConstructor statically-allocates space in which to store some | 5 // ManualConstructor statically-allocates space in which to store some |
6 // object, but does not initialize it. You can then call the constructor | 6 // object, but does not initialize it. You can then call the constructor |
7 // and destructor for the object yourself as you see fit. This is useful | 7 // and destructor for the object yourself as you see fit. This is useful |
8 // for memory management optimizations, where you want to initialize and | 8 // for memory management optimizations, where you want to initialize and |
9 // destroy an object multiple times but only allocate it once. | 9 // destroy an object multiple times but only allocate it once. |
10 // | 10 // |
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27 class ManualConstructor { | 27 class ManualConstructor { |
28 public: | 28 public: |
29 // No constructor or destructor because one of the most useful uses of | 29 // No constructor or destructor because one of the most useful uses of |
30 // this class is as part of a union, and members of a union cannot have | 30 // this class is as part of a union, and members of a union cannot have |
31 // constructors or destructors. And, anyway, the whole point of this | 31 // constructors or destructors. And, anyway, the whole point of this |
32 // class is to bypass these. | 32 // class is to bypass these. |
33 | 33 |
34 // Support users creating arrays of ManualConstructor<>s. This ensures that | 34 // Support users creating arrays of ManualConstructor<>s. This ensures that |
35 // the array itself has the correct alignment. | 35 // the array itself has the correct alignment. |
36 static void* operator new[](size_t size) { | 36 static void* operator new[](size_t size) { |
37 return AlignedAlloc(size, ALIGNOF(Type)); | 37 return AlignedAlloc(size, alignof(Type)); |
38 } | 38 } |
39 static void operator delete[](void* mem) { | 39 static void operator delete[](void* mem) { |
40 AlignedFree(mem); | 40 AlignedFree(mem); |
41 } | 41 } |
42 | 42 |
43 inline Type* get() { | 43 inline Type* get() { |
44 return space_.template data_as<Type>(); | 44 return space_.template data_as<Type>(); |
45 } | 45 } |
46 inline const Type* get() const { | 46 inline const Type* get() const { |
47 return space_.template data_as<Type>(); | 47 return space_.template data_as<Type>(); |
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60 | 60 |
61 inline void InitFromMove(ManualConstructor<Type>&& o) { | 61 inline void InitFromMove(ManualConstructor<Type>&& o) { |
62 Init(std::move(*o)); | 62 Init(std::move(*o)); |
63 } | 63 } |
64 | 64 |
65 inline void Destroy() { | 65 inline void Destroy() { |
66 get()->~Type(); | 66 get()->~Type(); |
67 } | 67 } |
68 | 68 |
69 private: | 69 private: |
70 AlignedMemory<sizeof(Type), ALIGNOF(Type)> space_; | 70 AlignedMemory<sizeof(Type), alignof(Type)> space_; |
71 }; | 71 }; |
72 | 72 |
73 } // namespace base | 73 } // namespace base |
74 | 74 |
75 #endif // BASE_MEMORY_MANUAL_CONSTRUCTOR_H_ | 75 #endif // BASE_MEMORY_MANUAL_CONSTRUCTOR_H_ |
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