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Implement Vec::from_elem (RFC 832)

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Implement `Vec::from_elem` by making the `vec![element; len]` macro
more powerful (see RFC 832).

Closes #22414
This commit is contained in:
Markus Siemens 2015-02-17 17:44:46 +01:00
parent f1bb6c2f46
commit 2bf553c3e0
3 changed files with 54 additions and 3 deletions
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5
src/test/run-pass/vec-macro-repeat.rs
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@ -14,4 +14,9 @@ pub fn main() {
assert_eq!(vec![1; 2], vec![1, 1]);
assert_eq!(vec![1; 1], vec![1]);
assert_eq!(vec![1; 0], vec![]);
// from_elem syntax (see RFC 832)
let el = Box::new(1);
let n = 3;
assert_eq!(vec![el; n], vec![Box::new(1), Box::new(1), Box::new(1)]);
}