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Implemented Default for arrays up to [T; 32] #27825

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Merged
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Aug 15, 2015
Merged

Implemented Default for arrays up to [T; 32] #27825

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24 changes: 24 additions & 0 deletions src/libcore/array.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -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;
Expand Down Expand Up @@ -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}