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Side by Side Diff: base/memory/weak_ptr.h

Issue 1549003002: Switch to standard integer types in base/memory/. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 4 years, 12 months ago
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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 // Weak pointers are pointers to an object that do not affect its lifetime, 5 // Weak pointers are pointers to an object that do not affect its lifetime,
6 // and which may be invalidated (i.e. reset to NULL) by the object, or its 6 // and which may be invalidated (i.e. reset to NULL) by the object, or its
7 // owner, at any time, most commonly when the object is about to be deleted. 7 // owner, at any time, most commonly when the object is about to be deleted.
8 8
9 // Weak pointers are useful when an object needs to be accessed safely by one 9 // Weak pointers are useful when an object needs to be accessed safely by one
10 // or more objects other than its owner, and those callers can cope with the 10 // or more objects other than its owner, and those callers can cope with the
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63 // unbound from the SequencedTaskRunner/Thread. The WeakPtrFactory may then be 63 // unbound from the SequencedTaskRunner/Thread. The WeakPtrFactory may then be
64 // destroyed, or new WeakPtr objects may be used, from a different sequence. 64 // destroyed, or new WeakPtr objects may be used, from a different sequence.
65 // 65 //
66 // Thus, at least one WeakPtr object must exist and have been dereferenced on 66 // Thus, at least one WeakPtr object must exist and have been dereferenced on
67 // the correct thread to enforce that other WeakPtr objects will enforce they 67 // the correct thread to enforce that other WeakPtr objects will enforce they
68 // are used on the desired thread. 68 // are used on the desired thread.
69 69
70 #ifndef BASE_MEMORY_WEAK_PTR_H_ 70 #ifndef BASE_MEMORY_WEAK_PTR_H_
71 #define BASE_MEMORY_WEAK_PTR_H_ 71 #define BASE_MEMORY_WEAK_PTR_H_
72 72
73 #include "base/basictypes.h"
74 #include "base/base_export.h" 73 #include "base/base_export.h"
75 #include "base/logging.h" 74 #include "base/logging.h"
75 #include "base/macros.h"
76 #include "base/memory/ref_counted.h" 76 #include "base/memory/ref_counted.h"
77 #include "base/sequence_checker.h" 77 #include "base/sequence_checker.h"
78 #include "base/template_util.h" 78 #include "base/template_util.h"
79 79
80 namespace base { 80 namespace base {
81 81
82 template <typename T> class SupportsWeakPtr; 82 template <typename T> class SupportsWeakPtr;
83 template <typename T> class WeakPtr; 83 template <typename T> class WeakPtr;
84 84
85 namespace internal { 85 namespace internal {
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336 // base::WeakPtr<Derived> ptr = derived.AsWeakPtr(); // Fails. 336 // base::WeakPtr<Derived> ptr = derived.AsWeakPtr(); // Fails.
337 337
338 template <typename Derived> 338 template <typename Derived>
339 WeakPtr<Derived> AsWeakPtr(Derived* t) { 339 WeakPtr<Derived> AsWeakPtr(Derived* t) {
340 return internal::SupportsWeakPtrBase::StaticAsWeakPtr<Derived>(t); 340 return internal::SupportsWeakPtrBase::StaticAsWeakPtr<Derived>(t);
341 } 341 }
342 342
343 } // namespace base 343 } // namespace base
344 344
345 #endif // BASE_MEMORY_WEAK_PTR_H_ 345 #endif // BASE_MEMORY_WEAK_PTR_H_
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