-
Notifications
You must be signed in to change notification settings - Fork 32
/
dst-struct-sole.rs
79 lines (67 loc) · 1.62 KB
/
dst-struct-sole.rs
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
//@ run-pass
// As dst-struct.rs, but the unsized field is the only field in the struct.
struct Fat<T: ?Sized> {
ptr: T
}
// x is a fat pointer
fn foo(x: &Fat<[isize]>) {
let y = &x.ptr;
assert_eq!(x.ptr.len(), 3);
assert_eq!(y[0], 1);
assert_eq!(x.ptr[1], 2);
}
fn foo2<T:ToBar>(x: &Fat<[T]>) {
let y = &x.ptr;
let bar = Bar;
assert_eq!(x.ptr.len(), 3);
assert_eq!(y[0].to_bar(), bar);
assert_eq!(x.ptr[1].to_bar(), bar);
}
#[derive(Copy, Clone, PartialEq, Eq, Debug)]
struct Bar;
trait ToBar {
fn to_bar(&self) -> Bar;
}
impl ToBar for Bar {
fn to_bar(&self) -> Bar {
*self
}
}
pub fn main() {
// With a vec of ints.
let f1 = Fat { ptr: [1, 2, 3] };
foo(&f1);
let f2 = &f1;
foo(f2);
let f3: &Fat<[isize]> = f2;
foo(f3);
let f4: &Fat<[isize]> = &f1;
foo(f4);
let f5: &Fat<[isize]> = &Fat { ptr: [1, 2, 3] };
foo(f5);
// With a vec of Bars.
let bar = Bar;
let f1 = Fat { ptr: [bar, bar, bar] };
foo2(&f1);
let f2 = &f1;
foo2(f2);
let f3: &Fat<[Bar]> = f2;
foo2(f3);
let f4: &Fat<[Bar]> = &f1;
foo2(f4);
let f5: &Fat<[Bar]> = &Fat { ptr: [bar, bar, bar] };
foo2(f5);
// Assignment.
let f5: &mut Fat<[isize]> = &mut Fat { ptr: [1, 2, 3] };
f5.ptr[1] = 34;
assert_eq!(f5.ptr[0], 1);
assert_eq!(f5.ptr[1], 34);
assert_eq!(f5.ptr[2], 3);
// Zero size vec.
let f5: &Fat<[isize]> = &Fat { ptr: [] };
assert!(f5.ptr.is_empty());
let f5: &Fat<[Bar]> = &Fat { ptr: [] };
assert!(f5.ptr.is_empty());
}
// ferrocene-annotations: fls_9ucqbbd0s2yo
// Struct Types