newtype-tools 1.0.13

A lightweight library designed to make the newtype idiom more ergonomic to use.
Documentation 
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

#![cfg(feature = "derive")]

const EXPECTED_WEIGHT: u64 = 1;

#[test]
fn div() {
    #[derive(Debug, newtype_tools::Newtype)]
    /// Doc comment.
    #[newtype(div(
        Oranges,
        output = "Weight",
        with = "|apples, oranges| Weight(apples.0 / (oranges.0 as u64 * 2))"
    ))]
    struct Apples(u64);
    #[derive(Debug)]
    struct Oranges(u32);
    #[derive(Debug, PartialEq)]
    struct Weight(u64);

    let res = Apples(42) / Oranges(21);
    assert_eq!(res, Weight(EXPECTED_WEIGHT));
    let res = &Apples(42) / Oranges(21);
    assert_eq!(res, Weight(EXPECTED_WEIGHT));
    let res = Apples(42) / &Oranges(21);
    assert_eq!(res, Weight(EXPECTED_WEIGHT));
    let res = &Apples(42) / &Oranges(21);
    assert_eq!(res, Weight(EXPECTED_WEIGHT));
}

#[test]
fn generic_div() {
    #[derive(Debug, newtype_tools::Newtype)]
    #[newtype(div(
        Oranges,
        output = "Weight",
        with = "|apples, oranges| Weight(apples.0.clone() / (oranges.0 as u64 * 2))"
    ))]
    struct Apples<T>(T)
    where
        T: core::ops::Div<u64, Output = u64> + Clone;
    #[derive(Debug)]
    struct Oranges(u32);
    #[derive(Debug, PartialEq)]
    struct Weight(u64);

    let res = Apples(42) / Oranges(21);
    assert_eq!(res, Weight(EXPECTED_WEIGHT));
    let res = &Apples(42) / Oranges(21);
    assert_eq!(res, Weight(EXPECTED_WEIGHT));
    let res = Apples(42) / &Oranges(21);
    assert_eq!(res, Weight(EXPECTED_WEIGHT));
    let res = &Apples(42) / &Oranges(21);
    assert_eq!(res, Weight(EXPECTED_WEIGHT));
}

#[test]
fn div_assign() {
    #[derive(Debug, newtype_tools::Newtype, PartialEq)]
    /// Doc comment.
    #[newtype(div_assign(Oranges, with = "|apples, oranges| apples.0 /= oranges.0 as u64 * 2"))]
    struct Apples(u64);
    #[derive(Debug, PartialEq)]
    struct Oranges(u32);

    let mut apples = Apples(42);
    apples /= Oranges(21);
    assert_eq!(apples, Apples(EXPECTED_WEIGHT));
    let mut apples = Apples(42);
    apples /= &Oranges(21);
    assert_eq!(apples, Apples(EXPECTED_WEIGHT));
}

#[test]
fn generic_div_assign() {
    #[derive(Debug, newtype_tools::Newtype, PartialEq)]
    #[newtype(div_assign(Oranges, with = "|apples, oranges| apples.0 /= oranges.0 as u64 * 2"))]
    struct Apples<T>(T)
    where
        T: core::ops::DivAssign<u64> + Clone;
    #[derive(Debug, PartialEq)]
    struct Oranges(u32);

    let mut apples = Apples(42);
    let oranges = Oranges(21);
    apples /= oranges;
    assert_eq!(apples, Apples(EXPECTED_WEIGHT));
    let mut apples = Apples(42);
    let oranges = Oranges(21);
    apples /= &oranges;
    assert_eq!(apples, Apples(EXPECTED_WEIGHT));
    assert_eq!(oranges, Oranges(21));
}