rinia 0.0.13

Stable numeric foundations for graphics, animation, and simulation.
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
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
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156

#![cfg(test)]

use alloc::vec::Vec;

use crate::numeric::{Cast, CastError, LossyCast, SaturatingCast, TryCast, TryExactCast};

#[derive(Clone, Copy, Debug, PartialEq, Eq)]
struct Thin<T>(T);

#[derive(Clone, Copy, Debug, PartialEq, Eq)]
struct Thick<T> {
    pub value1: T,
    pub value2: T,
}

crate::impl_numeric_casts_transparent!(Thin<T>);
crate::impl_numeric_casts_named_fields!(Thick<T>, [value1, value2]);

#[test]
fn transparent_casts_inherent_surface() {
    let src = Thin(123_i32);

    assert_eq!(src.cast::<i64>(), Thin(123_i64));
    assert_eq!(Thin::<i64>::cast_from(src), Thin(123_i64));

    assert_eq!(src.lossy_cast::<u8>(), Thin(123_u8));
    assert_eq!(Thin::<u8>::lossy_cast_from(src), Thin(123_u8));

    assert_eq!(Thin(300_i32).saturating_cast::<u8>(), Thin(u8::MAX));
    assert_eq!(Thin::<u8>::saturating_cast_from(Thin(300_i32)), Thin(u8::MAX));

    assert_eq!(Thin(255_i32).try_cast::<u8>(), Ok(Thin(255_u8)));
    assert_eq!(Thin::<u8>::try_cast_from(Thin(255_i32)), Ok(Thin(255_u8)));
    assert_eq!(Thin(256_i32).try_cast::<u8>(), Err(CastError::OutOfRange));

    assert_eq!(Thin(42_i32).try_exact_cast::<i64>(), Ok(Thin(42_i64)));
    assert_eq!(Thin::<i64>::try_exact_cast_from(Thin(42_i32)), Ok(Thin(42_i64)));
    assert_eq!(Thin(1.5_f32).try_exact_cast::<i32>(), Err(CastError::Fractional));
}

#[test]
fn transparent_casts_trait_surface() {
    let src = Thin(200_i32);

    let casted = <Thin<i32> as Cast<Thin<i64>>>::cast(src);
    assert_eq!(casted, Thin(200_i64));

    let lossy = <Thin<i32> as LossyCast<Thin<u8>>>::lossy_cast(src);
    assert_eq!(lossy, Thin(200_u8));

    let saturating = <Thin<i32> as SaturatingCast<Thin<u8>>>::saturating_cast(Thin(300_i32));
    assert_eq!(saturating, Thin(u8::MAX));

    let try_ok = <Thin<i32> as TryCast<Thin<u8>>>::try_cast(src);
    assert_eq!(try_ok, Ok(Thin(200_u8)));

    let try_err = <Thin<i32> as TryCast<Thin<u8>>>::try_cast(Thin(300_i32));
    assert_eq!(try_err, Err(CastError::OutOfRange));

    let try_exact_ok = <Thin<i32> as TryExactCast<Thin<i64>>>::try_exact_cast(Thin(7_i32));
    assert_eq!(try_exact_ok, Ok(Thin(7_i64)));

    let try_exact_err = <Thin<f32> as TryExactCast<Thin<i32>>>::try_exact_cast(Thin(2.25_f32));
    assert_eq!(try_exact_err, Err(CastError::Fractional));
}

#[test]
fn transparent_casts_named_fields_inherent_surface() {
    let src = Thick { value1: 100_i32, value2: 300_i32 };

    assert_eq!(src.cast::<i64>(), Thick { value1: 100_i64, value2: 300_i64 });
    assert_eq!(Thick::<i64>::cast_from(src), Thick { value1: 100_i64, value2: 300_i64 });

    assert_eq!(src.lossy_cast::<u8>(), Thick { value1: 100_u8, value2: 44_u8 });

    assert_eq!(Thick::<u8>::lossy_cast_from(src), Thick { value1: 100_u8, value2: 44_u8 });

    assert_eq!(src.saturating_cast::<u8>(), Thick { value1: 100_u8, value2: u8::MAX });

    assert_eq!(Thick::<u8>::saturating_cast_from(src), Thick { value1: 100_u8, value2: u8::MAX });

    assert_eq!(
        Thick { value1: 10_i32, value2: 255_i32 }.try_cast::<u8>(),
        Ok(Thick { value1: 10_u8, value2: 255_u8 })
    );

    assert_eq!(
        Thick::<u8>::try_cast_from(Thick { value1: 10_i32, value2: 300_i32 }),
        Err(CastError::OutOfRange)
    );

    assert_eq!(
        Thick::<i64>::try_exact_cast_from(Thick { value1: 1_i32, value2: 2_i32 }),
        Ok(Thick { value1: 1_i64, value2: 2_i64 })
    );
}

#[test]
fn transparent_casts_named_fields_trait_surface() {
    let src = Thick { value1: 7_i32, value2: 8_i32 };

    let casted = <Thick<i32> as Cast<Thick<i64>>>::cast(src);
    assert_eq!(casted, Thick { value1: 7_i64, value2: 8_i64 });

    let lossy = <Thick<i32> as LossyCast<Thick<u8>>>::lossy_cast(Thick {
        value1: 300_i32,
        value2: 511_i32,
    });
    assert_eq!(lossy, Thick { value1: 44_u8, value2: 255_u8 });

    let saturating = <Thick<i32> as SaturatingCast<Thick<u8>>>::saturating_cast(Thick {
        value1: 300_i32,
        value2: -1_i32,
    });
    assert_eq!(saturating, Thick { value1: u8::MAX, value2: 0_u8 });

    let try_ok =
        <Thick<i32> as TryCast<Thick<u8>>>::try_cast(Thick { value1: 1_i32, value2: 2_i32 });
    assert_eq!(try_ok, Ok(Thick { value1: 1_u8, value2: 2_u8 }));

    let try_err =
        <Thick<i32> as TryCast<Thick<u8>>>::try_cast(Thick { value1: 1_i32, value2: 300_i32 });
    assert_eq!(try_err, Err(CastError::OutOfRange));

    let try_exact_err = <Thick<f32> as TryExactCast<Thick<i32>>>::try_exact_cast(Thick {
        value1: 1.0_f32,
        value2: 1.5_f32,
    });
    assert_eq!(try_exact_err, Err(CastError::Fractional));
}

#[test]
fn vec_casts_surface() {
    let src = Vec::from([1_i32, 200, 300]);

    let casted: Vec<i64> = src.clone().cast();
    assert_eq!(casted, Vec::from([1_i64, 200, 300]));

    let lossy: Vec<u8> = src.clone().lossy_cast();
    assert_eq!(lossy, Vec::from([1_u8, 200, 44]));

    let saturating: Vec<u8> = src.clone().saturating_cast();
    assert_eq!(saturating, Vec::from([1_u8, 200, u8::MAX]));

    let try_err: Result<Vec<u8>, CastError> = src.clone().try_cast();
    assert_eq!(try_err, Err(CastError::OutOfRange));

    let try_ok: Result<Vec<u8>, CastError> = Vec::from([1_i32, 200]).try_cast();
    assert_eq!(try_ok, Ok(Vec::from([1_u8, 200])));

    let try_exact_ok: Result<Vec<i64>, CastError> = Vec::from([1_i32, 2]).try_exact_cast();
    assert_eq!(try_exact_ok, Ok(Vec::from([1_i64, 2])));

    let try_exact_err: Result<Vec<i32>, CastError> = Vec::from([1.0_f32, 1.5]).try_exact_cast();
    assert_eq!(try_exact_err, Err(CastError::Fractional));
}