Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

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

Merged
merged 1 commit into from
Aug 15, 2015
Merged

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

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
24 changes: 24 additions & 0 deletions src/libcore/array.rs
View file
Open in desktop
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}