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
|
// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_PERFORMANCE_MANAGER_GRAPH_NODE_INLINE_DATA_IMPL_H_
#define COMPONENTS_PERFORMANCE_MANAGER_GRAPH_NODE_INLINE_DATA_IMPL_H_
#include <concepts>
#include <memory>
#include <optional>
#include <type_traits>
#include <utility>
#include "base/check.h"
namespace performance_manager {
template <class T>
class SparseNodeInlineData;
namespace internal {
// Store the element as a std::optional<T>. Used for non-sparse
// NodeInlineData<T>.
template <class T>
class OptionalStorage {
public:
bool Exists() { return data_.has_value(); }
template <class... Args>
T& Create(Args&&... args) {
CHECK(!data_);
return data_.emplace(std::forward<Args>(args)...);
}
void Destroy() {
CHECK(data_);
data_.reset();
}
T& Get() {
CHECK(data_);
return *data_;
}
const T& Get() const {
CHECK(data_);
return *data_;
}
private:
std::optional<T> data_;
};
// Store the element in a std::unique_ptr<T>. Used for SparseNodeInlineData<T>.
template <class T>
class SparseStorage {
public:
bool Exists() { return data_.get(); }
template <class... Args>
T& Create(Args&&... args) {
CHECK(!data_);
data_ = std::make_unique<T>(std::forward<Args>(args)...);
return *data_;
}
void Destroy() {
CHECK(data_);
data_.reset();
}
T& Get() {
CHECK(data_);
return *data_;
}
const T& Get() const {
CHECK(data_);
return *data_;
}
private:
std::unique_ptr<T> data_;
};
template <typename T>
concept IsSparseNodeInlineData = std::derived_from<T, SparseNodeInlineData<T>>;
template <class T>
using Storage = std::conditional_t<IsSparseNodeInlineData<T>,
SparseStorage<T>,
OptionalStorage<T>>;
} // namespace internal
} // namespace performance_manager
#endif // COMPONENTS_PERFORMANCE_MANAGER_GRAPH_NODE_INLINE_DATA_IMPL_H_
|
