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
|
//@ run-pass
// Test that we can use method notation to call methods based on a
// projection bound from a trait. Issue #20469.
trait MakeString {
fn make_string(&self) -> String;
}
impl MakeString for isize {
fn make_string(&self) -> String {
format!("{}", *self)
}
}
impl MakeString for usize {
fn make_string(&self) -> String {
format!("{}", *self)
}
}
trait Foo {
type F: MakeString;
fn get(&self) -> &Self::F;
}
fn foo<F:Foo>(f: &F) -> String {
f.get().make_string()
}
struct SomeStruct {
field: isize,
}
impl Foo for SomeStruct {
type F = isize;
fn get(&self) -> &isize {
&self.field
}
}
struct SomeOtherStruct {
field: usize,
}
impl Foo for SomeOtherStruct {
type F = usize;
fn get(&self) -> &usize {
&self.field
}
}
fn main() {
let x = SomeStruct { field: 22 };
assert_eq!(foo(&x), format!("22"));
let x = SomeOtherStruct { field: 44 };
assert_eq!(foo(&x), format!("44"));
}
|
