31 lines
637 B
Rust
31 lines
637 B
Rust
use std::ops::Deref;
|
|
trait MyTrait: Deref<Target = u32> {}
|
|
struct MyStruct(u32);
|
|
impl MyTrait for MyStruct {}
|
|
impl Deref for MyStruct {
|
|
type Target = u32;
|
|
|
|
fn deref(&self) -> &Self::Target {
|
|
&self.0
|
|
}
|
|
}
|
|
fn get_concrete_value(i: u32) -> MyStruct {
|
|
MyStruct(i)
|
|
}
|
|
fn get_boxed_value(i: u32) -> Box<dyn MyTrait> {
|
|
Box::new(get_concrete_value(i))
|
|
}
|
|
fn main() {
|
|
let v = [1, 2, 3]
|
|
.iter()
|
|
.map(|i| get_boxed_value(*i))
|
|
.collect::<Vec<_>>();
|
|
|
|
let el = &v[0];
|
|
|
|
for _ in v {
|
|
//~^ ERROR cannot move out of `v` because it is borrowed
|
|
println!("{}", ***el > 0);
|
|
}
|
|
}
|