1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef PLATFORM_API_SERIAL_DELETE_PTR_H_
#define PLATFORM_API_SERIAL_DELETE_PTR_H_
#include <cassert>
#include <memory>
#include <utility>
#include "platform/api/task_runner.h"
namespace openscreen {
// A functor that deletes an object via a task on a specific TaskRunner. This is
// used for ensuring an object is deleted after any tasks that reference it have
// completed.
template <typename Type, typename DeleterType>
class SerialDelete {
public:
SerialDelete() : deleter_() {}
explicit SerialDelete(TaskRunner* task_runner)
: task_runner_(task_runner), deleter_() {
assert(task_runner);
}
template <typename DT>
SerialDelete(TaskRunner* task_runner, DT&& deleter)
: task_runner_(task_runner), deleter_(std::forward<DT>(deleter)) {
assert(task_runner);
}
void operator()(Type* pointer) const {
if (task_runner_) {
// Deletion of the object depends on the task being run by the task
// runner.
task_runner_->PostTask(
[pointer, deleter = std::move(deleter_)] { deleter(pointer); });
}
}
private:
TaskRunner* task_runner_;
DeleterType deleter_;
};
// A wrapper around std::unique_ptr<> that uses SerialDelete<> to schedule the
// object's deletion.
template <typename Type, typename DeleterType = std::default_delete<Type>>
class SerialDeletePtr
: public std::unique_ptr<Type, SerialDelete<Type, DeleterType>> {
public:
SerialDeletePtr() noexcept
: std::unique_ptr<Type, SerialDelete<Type, DeleterType>>(
nullptr,
SerialDelete<Type, DeleterType>()) {}
explicit SerialDeletePtr(TaskRunner* task_runner) noexcept
: std::unique_ptr<Type, SerialDelete<Type, DeleterType>>(
nullptr,
SerialDelete<Type, DeleterType>(task_runner)) {
assert(task_runner);
}
SerialDeletePtr(TaskRunner* task_runner, std::nullptr_t) noexcept
: std::unique_ptr<Type, SerialDelete<Type, DeleterType>>(
nullptr,
SerialDelete<Type, DeleterType>(task_runner)) {
assert(task_runner);
}
SerialDeletePtr(TaskRunner* task_runner, Type* pointer) noexcept
: std::unique_ptr<Type, SerialDelete<Type, DeleterType>>(
pointer,
SerialDelete<Type, DeleterType>(task_runner)) {
assert(task_runner);
}
SerialDeletePtr(
TaskRunner* task_runner,
Type* pointer,
typename std::conditional<std::is_reference<DeleterType>::value,
DeleterType,
const DeleterType&>::type deleter) noexcept
: std::unique_ptr<Type, SerialDelete<Type, DeleterType>>(
pointer,
SerialDelete<Type, DeleterType>(task_runner, deleter)) {
assert(task_runner);
}
SerialDeletePtr(
TaskRunner* task_runner,
Type* pointer,
typename std::remove_reference<DeleterType>::type&& deleter) noexcept
: std::unique_ptr<Type, SerialDelete<Type, DeleterType>>(
pointer,
SerialDelete<Type, DeleterType>(task_runner, std::move(deleter))) {
assert(task_runner);
}
};
template <typename Type, typename... Args>
SerialDeletePtr<Type> MakeSerialDelete(TaskRunner* task_runner,
Args&&... args) {
return SerialDeletePtr<Type>(task_runner,
new Type(std::forward<Args>(args)...));
}
} // namespace openscreen
#endif // PLATFORM_API_SERIAL_DELETE_PTR_H_
|
