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
|
use std::error::Error;
use std::fmt::{Display, Formatter};
use std::cmp::{min, max};
pub fn clamp<T: Ord>(val: T, lower: T, upper: T) -> T{
max(min(val, upper), lower)
}
pub type AnyError = Box<dyn Error + 'static>;
pub type Result<T> = std::result::Result<T, AnyError>;
#[derive(Debug)]
pub struct AError {
text: String
}
impl AError {
pub fn new(txt: &str) -> Self{
AError {
text: txt.to_string()
}
}
}
impl Error for AError {
fn source(&self) -> Option<&(dyn Error + 'static)> {
None
}
}
impl Display for AError {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
write!(f, "Error: {}", self.text)
}
}
#[macro_export]
macro_rules! aerr {
($description:expr) => {Box::new(crate::util::AError::new($description))}
}
#[macro_export]
macro_rules! err {
($description:expr) => {Err(crate::aerr!($description))}
}
#[macro_export]
macro_rules! hashmap {
( $($key:expr => $value:expr ),* ) => {{
#[allow(unused_mut)]
let mut h = std::collections::HashMap::new();
$(
h.insert($key, $value);
)*
h
}}
}
#[cfg(test)]
mod tests {
use std::collections::HashMap;
#[test]
fn test_hashmap_macro() {
let mut h = hashmap!("hello" => 1, "world" => 2);
assert_eq!(h.remove("hello"), Some(1));
assert_eq!(h.remove("world"), Some(2));
assert!(h.is_empty());
let h2: HashMap<i32, usize> = hashmap!();
assert!(h2.is_empty());
assert_eq!(h2, HashMap::new());
}
}
|
