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26 lines
465 B
26 lines
465 B
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 vec = &self.0;
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write!(f, "[")?;
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for (count, v) in vec.iter().enumerate() {
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if count != 0 {
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write!(f, ", ")?;
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}
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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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