derive_destructure2 0.1.3

Destructure structs that implement Drop
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

#[macro_use]
extern crate derive_destructure2;

#[derive(destructure, remove_trait_impls)]
struct Foo<'a, 'b, T> {
    some_ref: &'a i64,
    some_ref_mut: &'b mut i32,
    some_val: T,
}

impl<'a, 'b, T> Drop for Foo<'a, 'b, T> {
    fn drop(&mut self) {
        panic!("Shouldn't drop this");
    }
}

#[test]
fn test_simple_destructure() {
    let x = 3;
    let mut y = 4;
    let foo = Foo {
        some_ref: &x,
        some_ref_mut: &mut y,
        some_val: 5.6,
    };
    let (x, y, z) = foo.destructure();
    assert_eq!(*x, 3);
    assert_eq!(*y, 4);
    *y = 5;
    assert_eq!(*y, 5);
    assert_eq!(z, 5.6);
}

#[test]
fn test_simple_remove_trait_impls() {
    let x = 3;
    let mut y = 4;
    let foo = Foo {
        some_ref: &x,
        some_ref_mut: &mut y,
        some_val: 5.6,
    };
    let foo = foo.remove_trait_impls();
    assert_eq!(*foo.some_ref, 3);
    assert_eq!(*foo.some_ref_mut, 4);
    *foo.some_ref_mut = 5;
    assert_eq!(*foo.some_ref_mut, 5);
    assert_eq!(foo.some_val, 5.6);
}

trait SomeTrait {}
impl SomeTrait for i32 {}

#[derive(destructure, remove_trait_impls)]
struct TraitBounded<T: SomeTrait>(T);

impl<T: SomeTrait> Drop for TraitBounded<T> {
    fn drop(&mut self) {
        panic!("Shouldn't drop this");
    }
}

#[derive(destructure, remove_trait_impls)]
struct TraitBounded2<'a, 'b, T: SomeTrait + 'b>
where
    'b: 'a,
{
    r: &'a &'b T,
}

impl<'a, 'b: 'a, T: SomeTrait + 'b> Drop for TraitBounded2<'a, 'b, T> {
    fn drop(&mut self) {
        panic!("Shouldn't drop this");
    }
}

#[test]
fn test_trait_bounded_destructure() {
    let x = TraitBounded(7);
    let (x,) = x.destructure();
    assert_eq!(x, 7);
}

#[test]
fn test_trait_bounded_remove_trait_impls() {
    let x = TraitBounded(7);
    let x = x.remove_trait_impls();
    assert_eq!(x.0, 7);
}

#[test]
fn test_trait_bounded2_destructure() {
    let i = 7;
    let x = TraitBounded2 { r: &&i };
    let (r,) = x.destructure();
    assert_eq!(**r, 7);
}

#[test]
fn test_trait_bounded2_remove_trait_impls() {
    let i = 7;
    let x = TraitBounded2 { r: &&i };
    let x = x.remove_trait_impls();
    assert_eq!(**x.r, 7);
}