You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
24 lines
460 B
24 lines
460 B
use std::fmt;
|
|
|
|
struct List(Vec<i32>);
|
|
|
|
impl fmt::Display for List {
|
|
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
|
let List(ref vec) = *self;
|
|
|
|
try!(write!(f, "["));
|
|
|
|
for (count, v) in vec.iter().enumerate() {
|
|
if count != 0 { try!(write!(f, ", ")); }
|
|
try!(write!(f, "{}: {}", count, v));
|
|
}
|
|
|
|
write!(f, "]")
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
let v = List(vec![1, 2, 3]);
|
|
println!("{}", v);
|
|
}
|