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Side by Side Diff: content/child/scoped_web_callbacks.h

Issue 2047633002: Revert of Remove base/move.h (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 4 years, 6 months ago
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1 // Copyright 2015 The Chromium Authors. All rights reserved. 1 // Copyright 2015 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 #ifndef CONTENT_CHILD_SCOPED_WEB_CALLBACKS_H_ 5 #ifndef CONTENT_CHILD_SCOPED_WEB_CALLBACKS_H_
6 #define CONTENT_CHILD_SCOPED_WEB_CALLBACKS_H_ 6 #define CONTENT_CHILD_SCOPED_WEB_CALLBACKS_H_
7 7
8 #include <memory> 8 #include <memory>
9 #include <utility> 9 #include <utility>
10 10
11 #include "base/callback.h" 11 #include "base/callback.h"
12 #include "base/macros.h"
13 #include "base/memory/ptr_util.h" 12 #include "base/memory/ptr_util.h"
13 #include "base/move.h"
14 #include "third_party/WebKit/public/platform/WebCallbacks.h" 14 #include "third_party/WebKit/public/platform/WebCallbacks.h"
15 15
16 // A ScopedWebCallbacks is a move-only scoper which helps manage the lifetime of 16 // A ScopedWebCallbacks is a move-only scoper which helps manage the lifetime of
17 // a blink::WebCallbacks object. This is particularly useful when you're 17 // a blink::WebCallbacks object. This is particularly useful when you're
18 // simultaneously dealing with the following two conditions: 18 // simultaneously dealing with the following two conditions:
19 // 19 //
20 // 1. Your WebCallbacks implementation requires either onSuccess or onError to 20 // 1. Your WebCallbacks implementation requires either onSuccess or onError to
21 // be called before it's destroyed. This is the case with 21 // be called before it's destroyed. This is the case with
22 // CallbackPromiseAdapter for example, because its underlying 22 // CallbackPromiseAdapter for example, because its underlying
23 // ScriptPromiseResolver must be resolved or rejected before destruction. 23 // ScriptPromiseResolver must be resolved or rejected before destruction.
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60 // 60 //
61 // If the bound RespondWithSuccess callback actually runs, PassCallbacks() will 61 // If the bound RespondWithSuccess callback actually runs, PassCallbacks() will
62 // reliquish ownership of the WebCallbacks object to a temporary scoped_ptr 62 // reliquish ownership of the WebCallbacks object to a temporary scoped_ptr
63 // which will be destroyed immediately after onSuccess is called. 63 // which will be destroyed immediately after onSuccess is called.
64 // 64 //
65 // If the bound RespondWithSuccess callback is instead destroyed first, 65 // If the bound RespondWithSuccess callback is instead destroyed first,
66 // the ScopedWebCallbacks destructor will invoke OnCallbacksDropped, executing 66 // the ScopedWebCallbacks destructor will invoke OnCallbacksDropped, executing
67 // our desired default behavior before deleting the WebCallbacks. 67 // our desired default behavior before deleting the WebCallbacks.
68 template <typename CallbacksType> 68 template <typename CallbacksType>
69 class ScopedWebCallbacks { 69 class ScopedWebCallbacks {
70 MOVE_ONLY_TYPE_FOR_CPP_03(ScopedWebCallbacks);
71
70 public: 72 public:
71 using DestructionCallback = 73 using DestructionCallback =
72 base::Callback<void(std::unique_ptr<CallbacksType> callbacks)>; 74 base::Callback<void(std::unique_ptr<CallbacksType> callbacks)>;
73 75
74 ScopedWebCallbacks(std::unique_ptr<CallbacksType> callbacks, 76 ScopedWebCallbacks(std::unique_ptr<CallbacksType> callbacks,
75 const DestructionCallback& destruction_callback) 77 const DestructionCallback& destruction_callback)
76 : callbacks_(std::move(callbacks)), 78 : callbacks_(std::move(callbacks)),
77 destruction_callback_(destruction_callback) {} 79 destruction_callback_(destruction_callback) {}
78 80
79 ~ScopedWebCallbacks() { 81 ~ScopedWebCallbacks() {
80 if (callbacks_) 82 if (callbacks_)
81 destruction_callback_.Run(std::move(callbacks_)); 83 destruction_callback_.Run(std::move(callbacks_));
82 } 84 }
83 85
84 ScopedWebCallbacks(ScopedWebCallbacks&& other) { *this = std::move(other); } 86 ScopedWebCallbacks(ScopedWebCallbacks&& other) { *this = std::move(other); }
85 87
86 ScopedWebCallbacks& operator=(ScopedWebCallbacks&& other) { 88 ScopedWebCallbacks& operator=(ScopedWebCallbacks&& other) {
87 callbacks_ = std::move(other.callbacks_); 89 callbacks_ = std::move(other.callbacks_);
88 destruction_callback_ = other.destruction_callback_; 90 destruction_callback_ = other.destruction_callback_;
89 return *this; 91 return *this;
90 } 92 }
91 93
92 std::unique_ptr<CallbacksType> PassCallbacks() { 94 std::unique_ptr<CallbacksType> PassCallbacks() {
93 return std::move(callbacks_); 95 return std::move(callbacks_);
94 } 96 }
95 97
96 private: 98 private:
97 std::unique_ptr<CallbacksType> callbacks_; 99 std::unique_ptr<CallbacksType> callbacks_;
98 DestructionCallback destruction_callback_; 100 DestructionCallback destruction_callback_;
99
100 DISALLOW_COPY_AND_ASSIGN(ScopedWebCallbacks);
101 }; 101 };
102 102
103 template <typename CallbacksType> 103 template <typename CallbacksType>
104 ScopedWebCallbacks<CallbacksType> make_scoped_web_callbacks( 104 ScopedWebCallbacks<CallbacksType> make_scoped_web_callbacks(
105 CallbacksType* callbacks, 105 CallbacksType* callbacks,
106 const typename ScopedWebCallbacks<CallbacksType>::DestructionCallback& 106 const typename ScopedWebCallbacks<CallbacksType>::DestructionCallback&
107 destruction_callback) { 107 destruction_callback) {
108 return ScopedWebCallbacks<CallbacksType>(base::WrapUnique(callbacks), 108 return ScopedWebCallbacks<CallbacksType>(base::WrapUnique(callbacks),
109 destruction_callback); 109 destruction_callback);
110 } 110 }
111 111
112 #endif // CONTENT_CHILD_SCOPED_WEB_CALLBACKS_H_ 112 #endif // CONTENT_CHILD_SCOPED_WEB_CALLBACKS_H_
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