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
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use core::num::NonZeroU32;
use core::option::Option;
use core::option::Option::{Some, None};
use std::mem::size_of;
#[test]
fn test_create_nonzero_instance() {
let _a = unsafe {
NonZeroU32::new_unchecked(21)
};
}
#[test]
fn test_size_nonzero_in_option() {
assert_eq!(size_of::<NonZeroU32>(), size_of::<Option<NonZeroU32>>());
}
#[test]
fn test_match_on_nonzero_option() {
let a = Some(unsafe {
NonZeroU32::new_unchecked(42)
});
match a {
Some(val) => assert_eq!(val.get(), 42),
None => panic!("unexpected None while matching on Some(NonZeroU32(_))")
}
match unsafe { Some(NonZeroU32::new_unchecked(43)) } {
Some(val) => assert_eq!(val.get(), 43),
None => panic!("unexpected None while matching on Some(NonZeroU32(_))")
}
}
#[test]
fn test_match_option_empty_vec() {
let a: Option<Vec<isize>> = Some(vec![]);
match a {
None => panic!("unexpected None while matching on Some(vec![])"),
_ => {}
}
}
#[test]
fn test_match_option_vec() {
let a = Some(vec![1, 2, 3, 4]);
match a {
Some(v) => assert_eq!(v, [1, 2, 3, 4]),
None => panic!("unexpected None while matching on Some(vec![1, 2, 3, 4])")
}
}
#[test]
fn test_match_option_rc() {
use std::rc::Rc;
let five = Rc::new(5);
match Some(five) {
Some(r) => assert_eq!(*r, 5),
None => panic!("unexpected None while matching on Some(Rc::new(5))")
}
}
#[test]
fn test_match_option_arc() {
use std::sync::Arc;
let five = Arc::new(5);
match Some(five) {
Some(a) => assert_eq!(*a, 5),
None => panic!("unexpected None while matching on Some(Arc::new(5))")
}
}
#[test]
fn test_match_option_empty_string() {
let a = Some(String::new());
match a {
None => panic!("unexpected None while matching on Some(String::new())"),
_ => {}
}
}
#[test]
fn test_match_option_string() {
let five = "Five".to_string();
match Some(five) {
Some(s) => assert_eq!(s, "Five"),
None => panic!("unexpected None while matching on Some(String { ... })")
}
}
mod atom {
use core::num::NonZeroU32;
#[derive(PartialEq, Eq)]
pub struct Atom {
index: NonZeroU32, // private
}
pub const FOO_ATOM: Atom = Atom { index: unsafe { NonZeroU32::new_unchecked(7) } };
}
macro_rules! atom {
("foo") => { atom::FOO_ATOM }
}
#[test]
fn test_match_nonzero_const_pattern() {
match atom!("foo") {
// Using as a pattern is supported by the compiler:
atom!("foo") => {}
_ => panic!("Expected the const item as a pattern to match.")
}
}
#[test]
fn test_from_nonzero() {
let nz = NonZeroU32::new(1).unwrap();
let num: u32 = nz.into();
assert_eq!(num, 1u32);
}
|
