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Implemented Default for arrays up to [T; 32].

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Without Boats 2015-08-14 10:11:19 -07:00
parent c1e865c9df
commit 975a8ed312
1 changed files with 24 additions and 0 deletions
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24
src/libcore/array.rs
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@ -21,6 +21,7 @@
use clone::Clone;
use cmp::{PartialEq, Eq, PartialOrd, Ord, Ordering};
use convert::{AsRef, AsMut};
use default::Default;
use fmt;
use hash::{Hash, self};
use iter::IntoIterator;
@ -161,3 +162,26 @@ array_impls! {
20 21 22 23 24 25 26 27 28 29
30 31 32
}
// The Default impls cannot be generated using the array_impls! macro because
// they require array literals.
macro_rules! array_impl_default {
{$n:expr, $t:ident $($ts:ident)*} => {
#[stable(since = "1.4.0", feature = "array_default")]
impl<T> Default for [T; $n] where T: Default {
fn default() -> [T; $n] {
[$t::default(), $($ts::default()),*]
}
}
array_impl_default!{($n - 1), $($ts)*}
};
{$n:expr,} => {
#[stable(since = "1.4.0", feature = "array_default")]
impl<T> Default for [T; $n] {
fn default() -> [T; $n] { [] }
}
};
}
array_impl_default!{32, T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T}