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Merge pull request #20771 from Kimundi/vec-macro-repeat

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Enabled the `vec![]` macro to use the `[a; b]` repeat syntax.

Reviewed-by: alexcrichton
This commit is contained in:
bors 2015-01-10 14:15:09 +00:00
commit c0ca57a6fb
2 changed files with 22 additions and 1 deletions
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6
src/libcollections/macros.rs
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@ -1,4 +1,4 @@
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
@ -12,6 +12,10 @@
#[macro_export]
#[stable]
macro_rules! vec {
($x:expr; $y:expr) => ({
let xs: $crate::boxed::Box<[_]> = $crate::boxed::Box::new([$x; $y]);
$crate::slice::SliceExt::into_vec(xs)
});
($($x:expr),*) => ({
let xs: $crate::boxed::Box<[_]> = $crate::boxed::Box::new([$($x),*]);
$crate::slice::SliceExt::into_vec(xs)

17
src/test/run-pass/vec-macro-repeat.rs Normal file
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@ -0,0 +1,17 @@
// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
pub fn main() {
assert_eq!(vec![1; 3], vec![1, 1, 1]);
assert_eq!(vec![1; 2], vec![1, 1]);
assert_eq!(vec![1; 1], vec![1]);
assert_eq!(vec![1; 0], vec![]);
}