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Side by Side Diff: webrtc/base/ptr_util.h

Issue 2877023002: Move webrtc/{base => rtc_base} (Closed)
Patch Set: update presubmit.py and DEPS include rules Created 3 years, 5 months ago
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1 /* 1 /*
2 * Copyright 2017 The WebRTC Project Authors. All rights reserved. 2 * Copyright 2017 The WebRTC Project Authors. All rights reserved.
3 * 3 *
4 * Use of this source code is governed by a BSD-style license 4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source 5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found 6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may 7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree. 8 * be found in the AUTHORS file in the root of the source tree.
9 */ 9 */
10 10
11 // This implementation is borrowed from chromium. 11 // This implementation is borrowed from chromium.
12 12
13 #ifndef WEBRTC_BASE_PTR_UTIL_H_ 13 #ifndef WEBRTC_BASE_PTR_UTIL_H_
14 #define WEBRTC_BASE_PTR_UTIL_H_ 14 #define WEBRTC_BASE_PTR_UTIL_H_
15 15
16 #include <memory>
17 #include <utility>
18 16
19 namespace rtc { 17 // This header is deprecated and is just left here temporarily during
20 18 // refactoring. See https://bugs.webrtc.org/7634 for more details.
21 // Helper to transfer ownership of a raw pointer to a std::unique_ptr<T>. 19 #include "webrtc/rtc_base/ptr_util.h"
22 // Note that std::unique_ptr<T> has very different semantics from
23 // std::unique_ptr<T[]>: do not use this helper for array allocations.
24 template <typename T>
25 std::unique_ptr<T> WrapUnique(T* ptr) {
26 return std::unique_ptr<T>(ptr);
27 }
28
29 namespace internal {
30
31 template <typename T>
32 struct MakeUniqueResult {
33 using Scalar = std::unique_ptr<T>;
34 };
35
36 template <typename T>
37 struct MakeUniqueResult<T[]> {
38 using Array = std::unique_ptr<T[]>;
39 };
40
41 template <typename T, size_t N>
42 struct MakeUniqueResult<T[N]> {
43 using Invalid = void;
44 };
45
46 } // namespace internal
47
48 // Helper to construct an object wrapped in a std::unique_ptr. This is an
49 // implementation of C++14's std::make_unique that can be used in Chrome.
50 //
51 // MakeUnique<T>(args) should be preferred over WrapUnique(new T(args)): bare
52 // calls to `new` should be treated with scrutiny.
53 //
54 // Usage:
55 // // ptr is a std::unique_ptr<std::string>
56 // auto ptr = MakeUnique<std::string>("hello world!");
57 //
58 // // arr is a std::unique_ptr<int[]>
59 // auto arr = MakeUnique<int[]>(5);
60
61 // Overload for non-array types. Arguments are forwarded to T's constructor.
62 template <typename T, typename... Args>
63 typename internal::MakeUniqueResult<T>::Scalar MakeUnique(Args&&... args) {
64 return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
65 }
66
67 // Overload for array types of unknown bound, e.g. T[]. The array is allocated
68 // with `new T[n]()` and value-initialized: note that this is distinct from
69 // `new T[n]`, which default-initializes.
70 template <typename T>
71 typename internal::MakeUniqueResult<T>::Array MakeUnique(size_t size) {
72 return std::unique_ptr<T>(new typename std::remove_extent<T>::type[size]());
73 }
74
75 // Overload to reject array types of known bound, e.g. T[n].
76 template <typename T, typename... Args>
77 typename internal::MakeUniqueResult<T>::Invalid MakeUnique(Args&&... args) =
78 delete;
79
80 } // namespace rtc
81 20
82 #endif // WEBRTC_BASE_PTR_UTIL_H_ 21 #endif // WEBRTC_BASE_PTR_UTIL_H_
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