From Jason Turner

[optional.nullops]

C++14 → C++17 1.7 KB 67 lines
Current Draft | LaTeX Source
Archived: C++14 | C++17
Markdown: C++14 | C++17
Explore in Adventure Game

Diff to HTML by rtfpessoa

Files changed (1) hide show
  1. tmp/tmp2u_vbwh6/{from.md → to.md} +64 -0
tmp/tmp2u_vbwh6/{from.md → to.md} RENAMED
@@ -0,0 +1,64 @@
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1
+ ### Comparison with `nullopt` <a id="optional.nullops">[[optional.nullops]]</a>
2
+
3
+ ``` cpp
4
+ template <class T> constexpr bool operator==(const optional<T>& x, nullopt_t) noexcept;
5
+ template <class T> constexpr bool operator==(nullopt_t, const optional<T>& x) noexcept;
6
+ ```
7
+
8
+ *Returns:* `!x`.
9
+
10
+ ``` cpp
11
+ template <class T> constexpr bool operator!=(const optional<T>& x, nullopt_t) noexcept;
12
+ template <class T> constexpr bool operator!=(nullopt_t, const optional<T>& x) noexcept;
13
+ ```
14
+
15
+ *Returns:* `bool(x)`.
16
+
17
+ ``` cpp
18
+ template <class T> constexpr bool operator<(const optional<T>& x, nullopt_t) noexcept;
19
+ ```
20
+
21
+ *Returns:* `false`.
22
+
23
+ ``` cpp
24
+ template <class T> constexpr bool operator<(nullopt_t, const optional<T>& x) noexcept;
25
+ ```
26
+
27
+ *Returns:* `bool(x)`.
28
+
29
+ ``` cpp
30
+ template <class T> constexpr bool operator<=(const optional<T>& x, nullopt_t) noexcept;
31
+ ```
32
+
33
+ *Returns:* `!x`.
34
+
35
+ ``` cpp
36
+ template <class T> constexpr bool operator<=(nullopt_t, const optional<T>& x) noexcept;
37
+ ```
38
+
39
+ *Returns:* `true`.
40
+
41
+ ``` cpp
42
+ template <class T> constexpr bool operator>(const optional<T>& x, nullopt_t) noexcept;
43
+ ```
44
+
45
+ *Returns:* `bool(x)`.
46
+
47
+ ``` cpp
48
+ template <class T> constexpr bool operator>(nullopt_t, const optional<T>& x) noexcept;
49
+ ```
50
+
51
+ *Returns:* `false`.
52
+
53
+ ``` cpp
54
+ template <class T> constexpr bool operator>=(const optional<T>& x, nullopt_t) noexcept;
55
+ ```
56
+
57
+ *Returns:* `true`.
58
+
59
+ ``` cpp
60
+ template <class T> constexpr bool operator>=(nullopt_t, const optional<T>& x) noexcept;
61
+ ```
62
+
63
+ *Returns:* `!x`.
64
+