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Rollup merge of #102200 - ink-feather-org:const_default_impls, r=fee1-dead

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Constify Default impl's for Arrays and Tuples.

Allows to create arrays and tuples in const Context using the ~const Default implementation of the inner type.
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fee1-dead 2022-09-25 22:06:40 +08:00 committed by GitHub
commit 69aa41b000
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2 changed files with 4 additions and 2 deletions
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3
library/core/src/array/mod.rs
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@ -434,7 +434,8 @@ impl<T: Copy> SpecArrayClone for T {
macro_rules! array_impl_default { macro_rules! array_impl_default {
{$n:expr, $t:ident $($ts:ident)*} => { {$n:expr, $t:ident $($ts:ident)*} => {
#[stable(since = "1.4.0", feature = "array_default")] #[stable(since = "1.4.0", feature = "array_default")]
impl<T> Default for [T; $n] where T: Default { #[rustc_const_unstable(feature = "const_default_impls", issue = "87864")]
impl<T> const Default for [T; $n] where T: ~const Default {
fn default() -> [T; $n] { fn default() -> [T; $n] {
[$t::default(), $($ts::default()),*] [$t::default(), $($ts::default()),*]
} }

3
library/core/src/tuple.rs
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@ -93,7 +93,8 @@ macro_rules! tuple_impls {
maybe_tuple_doc! { maybe_tuple_doc! {
$($T)+ @ $($T)+ @
#[stable(feature = "rust1", since = "1.0.0")] #[stable(feature = "rust1", since = "1.0.0")]
impl<$($T:Default),+> Default for ($($T,)+) { #[rustc_const_unstable(feature = "const_default_impls", issue = "87864")]
impl<$($T: ~const Default),+> const Default for ($($T,)+) {
#[inline] #[inline]
fn default() -> ($($T,)+) { fn default() -> ($($T,)+) {
($({ let x: $T = Default::default(); x},)+) ($({ let x: $T = Default::default(); x},)+)