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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 // Scopers help you manage ownership of a pointer, helping you easily manage a | 5 // Scopers help you manage ownership of a pointer, helping you easily manage a |
| 6 // pointer within a scope, and automatically destroying the pointer at the end | 6 // pointer within a scope, and automatically destroying the pointer at the end |
| 7 // of a scope. There are two main classes you will use, which correspond to the | 7 // of a scope. There are two main classes you will use, which correspond to the |
| 8 // operators new/delete and new[]/delete[]. | 8 // operators new/delete and new[]/delete[]. |
| 9 // | 9 // |
| 10 // Example usage (scoped_ptr<T>): | 10 // Example usage (scoped_ptr<T>): |
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| 73 // | 73 // |
| 74 // scoped_ptr<Foo> foo(new Foo()); | 74 // scoped_ptr<Foo> foo(new Foo()); |
| 75 // scoped_ptr<FooParent> parent(foo.Pass()); | 75 // scoped_ptr<FooParent> parent(foo.Pass()); |
| 76 | 76 |
| 77 #ifndef BASE_MEMORY_SCOPED_PTR_H_ | 77 #ifndef BASE_MEMORY_SCOPED_PTR_H_ |
| 78 #define BASE_MEMORY_SCOPED_PTR_H_ | 78 #define BASE_MEMORY_SCOPED_PTR_H_ |
| 79 | 79 |
| 80 // This is an implementation designed to match the anticipated future TR2 | 80 // This is an implementation designed to match the anticipated future TR2 |
| 81 // implementation of the scoped_ptr class. | 81 // implementation of the scoped_ptr class. |
| 82 | 82 |
| 83 #include <assert.h> | |
| 84 #include <stddef.h> | 83 #include <stddef.h> |
| 85 #include <stdlib.h> | 84 #include <stdlib.h> |
| 86 | 85 |
| 87 #include <algorithm> // For std::swap(). | 86 #include <algorithm> // For std::swap(). |
| 88 #include <iosfwd> | 87 #include <iosfwd> |
| 89 | 88 |
| 90 #include "base/basictypes.h" | 89 #include "base/basictypes.h" |
| 91 #include "base/compiler_specific.h" | 90 #include "base/compiler_specific.h" |
| 91 #include "base/logging.h" | |
|
danakj
2015/09/03 17:16:27
This will include logging in a lot of places. Does
| |
| 92 #include "base/move.h" | 92 #include "base/move.h" |
| 93 #include "base/template_util.h" | 93 #include "base/template_util.h" |
| 94 | 94 |
| 95 namespace base { | 95 namespace base { |
| 96 | 96 |
| 97 namespace subtle { | 97 namespace subtle { |
| 98 class RefCountedBase; | 98 class RefCountedBase; |
| 99 class RefCountedThreadSafeBase; | 99 class RefCountedThreadSafeBase; |
| 100 } // namespace subtle | 100 } // namespace subtle |
| 101 | 101 |
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| 219 if (data_.ptr != nullptr) { | 219 if (data_.ptr != nullptr) { |
| 220 // Not using get_deleter() saves one function call in non-optimized | 220 // Not using get_deleter() saves one function call in non-optimized |
| 221 // builds. | 221 // builds. |
| 222 static_cast<D&>(data_)(data_.ptr); | 222 static_cast<D&>(data_)(data_.ptr); |
| 223 } | 223 } |
| 224 } | 224 } |
| 225 | 225 |
| 226 void reset(T* p) { | 226 void reset(T* p) { |
| 227 // This is a self-reset, which is no longer allowed for default deleters: | 227 // This is a self-reset, which is no longer allowed for default deleters: |
| 228 // https://crbug.com/162971 | 228 // https://crbug.com/162971 |
| 229 assert(!ShouldAbortOnSelfReset<D>::value || p == nullptr || p != data_.ptr); | 229 DCHECK(!ShouldAbortOnSelfReset<D>::value || p == nullptr || p != data_.ptr); |
| 230 | 230 |
| 231 // Note that running data_.ptr = p can lead to undefined behavior if | 231 // Note that running data_.ptr = p can lead to undefined behavior if |
| 232 // get_deleter()(get()) deletes this. In order to prevent this, reset() | 232 // get_deleter()(get()) deletes this. In order to prevent this, reset() |
| 233 // should update the stored pointer before deleting its old value. | 233 // should update the stored pointer before deleting its old value. |
| 234 // | 234 // |
| 235 // However, changing reset() to use that behavior may cause current code to | 235 // However, changing reset() to use that behavior may cause current code to |
| 236 // break in unexpected ways. If the destruction of the owned object | 236 // break in unexpected ways. If the destruction of the owned object |
| 237 // dereferences the scoped_ptr when it is destroyed by a call to reset(), | 237 // dereferences the scoped_ptr when it is destroyed by a call to reset(), |
| 238 // then it will incorrectly dispatch calls to |p| rather than the original | 238 // then it will incorrectly dispatch calls to |p| rather than the original |
| 239 // value of |data_.ptr|. | 239 // value of |data_.ptr|. |
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| 370 scoped_ptr& operator=(decltype(nullptr)) { | 370 scoped_ptr& operator=(decltype(nullptr)) { |
| 371 reset(); | 371 reset(); |
| 372 return *this; | 372 return *this; |
| 373 } | 373 } |
| 374 | 374 |
| 375 // Reset. Deletes the currently owned object, if any. | 375 // Reset. Deletes the currently owned object, if any. |
| 376 // Then takes ownership of a new object, if given. | 376 // Then takes ownership of a new object, if given. |
| 377 void reset(element_type* p = nullptr) { impl_.reset(p); } | 377 void reset(element_type* p = nullptr) { impl_.reset(p); } |
| 378 | 378 |
| 379 // Accessors to get the owned object. | 379 // Accessors to get the owned object. |
| 380 // operator* and operator-> will assert() if there is no current object. | 380 // operator* and operator-> will DCHECK() if there is no current object. |
| 381 element_type& operator*() const { | 381 element_type& operator*() const { |
| 382 assert(impl_.get() != nullptr); | 382 DCHECK(impl_.get() != nullptr); |
| 383 return *impl_.get(); | 383 return *impl_.get(); |
| 384 } | 384 } |
| 385 element_type* operator->() const { | 385 element_type* operator->() const { |
| 386 assert(impl_.get() != nullptr); | 386 DCHECK(impl_.get() != nullptr); |
| 387 return impl_.get(); | 387 return impl_.get(); |
| 388 } | 388 } |
| 389 element_type* get() const { return impl_.get(); } | 389 element_type* get() const { return impl_.get(); } |
| 390 | 390 |
| 391 // Access to the deleter. | 391 // Access to the deleter. |
| 392 deleter_type& get_deleter() { return impl_.get_deleter(); } | 392 deleter_type& get_deleter() { return impl_.get_deleter(); } |
| 393 const deleter_type& get_deleter() const { return impl_.get_deleter(); } | 393 const deleter_type& get_deleter() const { return impl_.get_deleter(); } |
| 394 | 394 |
| 395 // Allow scoped_ptr<element_type> to be used in boolean expressions, but not | 395 // Allow scoped_ptr<element_type> to be used in boolean expressions, but not |
| 396 // implicitly convertible to a real bool (which is dangerous). | 396 // implicitly convertible to a real bool (which is dangerous). |
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| 488 reset(); | 488 reset(); |
| 489 return *this; | 489 return *this; |
| 490 } | 490 } |
| 491 | 491 |
| 492 // Reset. Deletes the currently owned array, if any. | 492 // Reset. Deletes the currently owned array, if any. |
| 493 // Then takes ownership of a new object, if given. | 493 // Then takes ownership of a new object, if given. |
| 494 void reset(element_type* array = nullptr) { impl_.reset(array); } | 494 void reset(element_type* array = nullptr) { impl_.reset(array); } |
| 495 | 495 |
| 496 // Accessors to get the owned array. | 496 // Accessors to get the owned array. |
| 497 element_type& operator[](size_t i) const { | 497 element_type& operator[](size_t i) const { |
| 498 assert(impl_.get() != nullptr); | 498 DCHECK(impl_.get() != nullptr); |
| 499 return impl_.get()[i]; | 499 return impl_.get()[i]; |
| 500 } | 500 } |
| 501 element_type* get() const { return impl_.get(); } | 501 element_type* get() const { return impl_.get(); } |
| 502 | 502 |
| 503 // Access to the deleter. | 503 // Access to the deleter. |
| 504 deleter_type& get_deleter() { return impl_.get_deleter(); } | 504 deleter_type& get_deleter() { return impl_.get_deleter(); } |
| 505 const deleter_type& get_deleter() const { return impl_.get_deleter(); } | 505 const deleter_type& get_deleter() const { return impl_.get_deleter(); } |
| 506 | 506 |
| 507 // Allow scoped_ptr<element_type> to be used in boolean expressions, but not | 507 // Allow scoped_ptr<element_type> to be used in boolean expressions, but not |
| 508 // implicitly convertible to a real bool (which is dangerous). | 508 // implicitly convertible to a real bool (which is dangerous). |
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| 585 scoped_ptr<T> make_scoped_ptr(T* ptr) { | 585 scoped_ptr<T> make_scoped_ptr(T* ptr) { |
| 586 return scoped_ptr<T>(ptr); | 586 return scoped_ptr<T>(ptr); |
| 587 } | 587 } |
| 588 | 588 |
| 589 template <typename T> | 589 template <typename T> |
| 590 std::ostream& operator<<(std::ostream& out, const scoped_ptr<T>& p) { | 590 std::ostream& operator<<(std::ostream& out, const scoped_ptr<T>& p) { |
| 591 return out << p.get(); | 591 return out << p.get(); |
| 592 } | 592 } |
| 593 | 593 |
| 594 #endif // BASE_MEMORY_SCOPED_PTR_H_ | 594 #endif // BASE_MEMORY_SCOPED_PTR_H_ |
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