blob: c5982af7bfce9e54ee910f80f0b37868f17b2f1b (
plain) (
blame)
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
|
#pragma once
#include <util/string/cast.h>
#include <optional>
namespace NYT {
////////////////////////////////////////////////////////////////////////////////
template <class T>
struct TOptionalTraits
{
using TOptional = std::optional<T>;
using TValue = T;
static constexpr bool HasValue(const TOptional& opt)
{
return opt.has_value();
}
static constexpr TOptional Empty()
{
return std::nullopt;
}
};
template <class T>
struct TOptionalTraits<std::optional<T>>
{
using TOptional = std::optional<T>;
using TValue = T;
static constexpr bool HasValue(const TOptional& opt)
{
return opt.has_value();
}
static constexpr TOptional Empty()
{
return std::nullopt;
}
};
template <class T>
struct TOptionalTraits<T*>
{
using TOptional = T*;
using TValue = T*;
static constexpr bool HasValue(const TOptional& opt)
{
return opt != nullptr;
}
static constexpr TOptional Empty()
{
return nullptr;
}
};
template <class T>
struct TOptionalTraits<TIntrusivePtr<T>>
{
using TOptional = TIntrusivePtr<T>;
using TValue = TIntrusivePtr<T>;
static bool HasValue(const TOptional& opt)
{
return opt.Get() != nullptr;
}
static constexpr TOptional Empty()
{
return TIntrusivePtr<T>{};
}
};
////////////////////////////////////////////////////////////////////////////////
template <class T>
struct TStdOptionalTraits
{
static constexpr bool IsStdOptional = false;
using TValueType = T;
};
template <class T>
struct TStdOptionalTraits<std::optional<T>>
{
static constexpr bool IsStdOptional = true;
using TValueType = T;
};
////////////////////////////////////////////////////////////////////////////////
} // namespace NYT
template <class T>
struct THash<std::optional<T>>
{
size_t operator()(const std::optional<T>& nullable) const
{
return nullable ? THash<T>()(*nullable) : 0;
}
};
|
