meta_tuple 0.5.0

A statically typed opaque tuple that can contain any type.
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

use core::fmt::Display;

use meta_tuple::{
    IntoMetaTuple, MetaAny, MetaItem, MetaQuery, MetaTuple, meta_tuple, meta_tuple_type,
};

#[derive(Debug, PartialEq, Eq, MetaItem)]
struct MyType;

#[derive(Debug, PartialEq, Eq, MetaItem)]
struct MyTypeGeneric<T>(T);

#[derive(MetaItem)]
struct MyTypeGeneric2<T: Display>(T);

#[derive(MetaItem)]
struct MyTypeGeneric3<T: Display, const N: usize>(T);

#[derive(MetaItem)]
struct MyTypeGeneric4<T: Display, const N: usize>(T);

#[test]
pub fn test() {
    let _: () = meta_tuple!();
    let mut a = meta_tuple!(1i32);
    assert_eq!(a.get::<i32>(), Some(&1));
    assert_eq!(a.get_mut::<i32>(), Some(&mut 1));
    assert_eq!(a.get::<u32>(), None);

    let b = meta_tuple!(1i32, "hello", vec![1, 2, 3]);
    assert_eq!(b.get::<i32>(), Some(&1));
    assert_eq!(b.get::<&str>(), Some(&"hello"));
    assert_eq!(b.get::<Vec<i32>>(), Some(&vec![1, 2, 3]));
    assert_eq!(b.get::<u32>(), None);

    let s = String::from("hello");
    let mut v = vec![1, 2, 3];
    let mut c = meta_tuple!(1i32, &s, &mut v);
    assert_eq!(c.get::<i32>(), Some(&1));
    assert_eq!(c.get::<String>(), Some(&s));
    assert_eq!(c.get_mut::<String>(), None);
    assert_eq!(c.get::<Vec<i32>>(), Some(&vec![1, 2, 3]));
    assert_eq!(c.get_mut::<Vec<i32>>(), Some(&mut vec![1, 2, 3]));
    assert_eq!(c.get::<&str>(), None);

    let d = meta_tuple!(4.0f32, vec![1,2], #MyTypeGeneric("Hi"), #&MyType, #c);
    assert_eq!(d.get::<i32>(), Some(&1));
    assert_eq!(d.get::<f32>(), Some(&4.0));
    assert_eq!(d.get::<String>(), Some(&s));
    assert_eq!(d.get::<MyTypeGeneric<&str>>(), Some(&MyTypeGeneric("Hi")));
    assert_eq!(d.get::<MyType>(), Some(&MyType));
    assert_eq!(d.get::<Vec<i32>>(), Some(&vec![1, 2]));

    let e: Box<dyn MetaAny> = Box::new(d);
    assert_eq!(e.get::<i32>(), Some(&1));
    assert_eq!(e.get::<f32>(), Some(&4.0));
    assert_eq!(e.get::<String>(), Some(&s));
    assert_eq!(e.get::<MyTypeGeneric<&str>>(), Some(&MyTypeGeneric("Hi")));
    assert_eq!(e.get::<MyType>(), Some(&MyType));
    assert_eq!(e.get::<Vec<i32>>(), Some(&vec![1, 2]));

    let _t0: meta_tuple_type!(i32) = meta_tuple!(1i32);
    let _t1: meta_tuple_type!(i32, f32, u32) = meta_tuple!(1i32, 1f32, 1u32);
    let _t2: meta_tuple_type!(&i32) = meta_tuple!(&1i32);
    let _t3: meta_tuple_type!(&mut i32) = meta_tuple!(&mut 1i32);
    let _t4: meta_tuple_type!(i32, &u32) = meta_tuple!(1i32, &2u32);

    let f = (1, 4.5f32, "hi").into_meta_tuple();
    assert_eq!(f.get::<i32>(), Some(&1));
    assert_eq!(f.get::<f32>(), Some(&4.5));
    assert_eq!(f.get::<&str>(), Some(&"hi"));

    let g = (&(1, 4.5f32, "hi")).into_meta_tuple();
    assert_eq!(g.get::<i32>(), Some(&1));
    assert_eq!(g.get::<f32>(), Some(&4.5));
    assert_eq!(g.get::<&str>(), Some(&"hi"));

    let tuple3 = meta_tuple!(1, '2', "3");

    let tuple4: &dyn MetaAny = &meta_tuple!(5u32, 6u64, 7.0);

    let joined = tuple3.join_dyn_ref(tuple4);
    assert_eq!(joined.get::<i32>(), Some(&1));
    assert_eq!(joined.get::<char>(), Some(&'2'));
    assert_eq!(joined.get::<&str>(), Some(&"3"));
    assert_eq!(joined.get::<u32>(), Some(&5u32));
    assert_eq!(joined.get::<u64>(), Some(&6u64));
    assert_eq!(joined.get::<f64>(), Some(&7.0));
}

#[derive(Debug, MetaTuple)]
pub struct MyTuple {
    pub int: i32,
    pub string: String,
    pub char: char,
    pub float: f32,
}

#[derive(Debug, MetaTuple)]
pub struct MyTuple2(&'static str, Vec<u8>, i32);

#[derive(Debug, MetaQuery, PartialEq, Eq)]
pub struct IntQuery<'t> {
    pub a: &'t i32,
}

#[derive(Debug, MetaQuery, PartialEq, Eq)]
pub struct IntQuery2<'t>(&'t i32);

#[derive(Debug, MetaQuery, PartialEq, Eq)]
pub struct MyQuery<'t> {
    pub a: &'t i32,
    pub b: &'t &'static str,
}

#[derive(Debug, MetaQuery, PartialEq, Eq)]
pub struct MyGenericQuery<'t, A, B> {
    pub a: &'t A,
    pub b: &'t B,
}

#[test]
pub fn test_query() {
    let tuple = MyTuple {
        int: 21,
        string: "Hello".to_owned(),
        char: 'c',
        float: 3.1,
    };
    assert_eq!(tuple.query_ref::<()>(), Some(()));
    assert_eq!(tuple.query_ref::<(&i32, &char)>(), Some((&21, &'c')));
    assert_eq!(
        tuple.query_ref::<(&f32, &String, &i32)>(),
        Some((&3.1, &"Hello".to_owned(), &21))
    );
    assert_eq!(tuple.query_ref::<(&f32, &&str, &i32)>(), None);

    let tuple2 = MyTuple2("1", vec![1, 2, 3], 4);
    assert_eq!(tuple2.query_ref::<IntQuery>(), Some(IntQuery { a: &4 }));
    assert_eq!(tuple2.query_ref::<IntQuery2>(), Some(IntQuery2(&4)));
    assert_eq!(
        tuple2.query_ref::<MyQuery>(),
        Some(MyQuery { a: &4, b: &"1" })
    );
    assert_eq!(
        tuple2.query_ref::<MyGenericQuery<&str, Vec<u8>>>(),
        Some(MyGenericQuery {
            a: &"1",
            b: &vec![1, 2, 3]
        })
    );
}