24 lines
460 B
Rust
24 lines
460 B
Rust
use std::fmt;
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struct List(Vec<i32>);
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impl fmt::Display for List {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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let List(ref vec) = *self;
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try!(write!(f, "["));
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for (count, v) in vec.iter().enumerate() {
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if count != 0 { try!(write!(f, ", ")); }
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try!(write!(f, "{}: {}", count, v));
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}
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write!(f, "]")
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}
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}
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fn main() {
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let v = List(vec![1, 2, 3]);
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println!("{}", v);
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}
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