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Use const generics for some Vec/CCow impls.

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This commit is contained in:
Mazdak Farrokhzad 2019-07-28 05:06:20 +02:00
parent c798dffac9
commit 8b57f689d5
2 changed files with 25 additions and 33 deletions
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56
src/liballoc/vec.rs
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@ -56,6 +56,7 @@
#![stable(feature = "rust1", since = "1.0.0")]
use core::array::LengthAtMost32;
use core::cmp::{self, Ordering};
use core::fmt;
use core::hash::{self, Hash};
@ -2171,47 +2172,36 @@ impl<'a, T: 'a + Copy> Extend<&'a T> for Vec<T> {
}
macro_rules! __impl_slice_eq1 {
($Lhs: ty, $Rhs: ty) => {
__impl_slice_eq1! { $Lhs, $Rhs, Sized }
};
($Lhs: ty, $Rhs: ty, $Bound: ident) => {
([$($vars:tt)*] $lhs:ty, $rhs:ty, $($constraints:tt)*) => {
#[stable(feature = "rust1", since = "1.0.0")]
impl<'a, 'b, A: $Bound, B> PartialEq<$Rhs> for $Lhs where A: PartialEq<B> {
impl<A, B, $($vars)*> PartialEq<$rhs> for $lhs
where
A: PartialEq<B>,
$($constraints)*
{
#[inline]
fn eq(&self, other: &$Rhs) -> bool { self[..] == other[..] }
fn eq(&self, other: &$rhs) -> bool { self[..] == other[..] }
#[inline]
fn ne(&self, other: &$Rhs) -> bool { self[..] != other[..] }
fn ne(&self, other: &$rhs) -> bool { self[..] != other[..] }
}
}
}
__impl_slice_eq1! { Vec<A>, Vec<B> }
__impl_slice_eq1! { Vec<A>, &'b [B] }
__impl_slice_eq1! { Vec<A>, &'b mut [B] }
__impl_slice_eq1! { Cow<'a, [A]>, &'b [B], Clone }
__impl_slice_eq1! { Cow<'a, [A]>, &'b mut [B], Clone }
__impl_slice_eq1! { Cow<'a, [A]>, Vec<B>, Clone }
__impl_slice_eq1! { [] Vec<A>, Vec<B>, }
__impl_slice_eq1! { [] Vec<A>, &[B], }
__impl_slice_eq1! { [] Vec<A>, &mut [B], }
__impl_slice_eq1! { [] Cow<'_, [A]>, &[B], A: Clone }
__impl_slice_eq1! { [] Cow<'_, [A]>, &mut [B], A: Clone }
__impl_slice_eq1! { [] Cow<'_, [A]>, Vec<B>, A: Clone }
__impl_slice_eq1! { [const N: usize] Vec<A>, [B; N], [B; N]: LengthAtMost32 }
__impl_slice_eq1! { [const N: usize] Vec<A>, &[B; N], [B; N]: LengthAtMost32 }
macro_rules! array_impls {
($($N: expr)+) => {
$(
// NOTE: some less important impls are omitted to reduce code bloat
__impl_slice_eq1! { Vec<A>, [B; $N] }
__impl_slice_eq1! { Vec<A>, &'b [B; $N] }
// __impl_slice_eq1! { Vec<A>, &'b mut [B; $N] }
// __impl_slice_eq1! { Cow<'a, [A]>, [B; $N], Clone }
// __impl_slice_eq1! { Cow<'a, [A]>, &'b [B; $N], Clone }
// __impl_slice_eq1! { Cow<'a, [A]>, &'b mut [B; $N], Clone }
)+
}
}
array_impls! {
0 1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19
20 21 22 23 24 25 26 27 28 29
30 31 32
}
// NOTE: some less important impls are omitted to reduce code bloat
// FIXME(Centril): Reconsider this?
//__impl_slice_eq1! { [const N: usize] Vec<A>, &mut [B; N], [B; N]: LengthAtMost32 }
//__impl_slice_eq1! { [const N: usize] Cow<'a, [A]>, [B; N], [B; N]: LengthAtMost32 }
//__impl_slice_eq1! { [const N: usize] Cow<'a, [A]>, &[B; N], [B; N]: LengthAtMost32 }
//__impl_slice_eq1! { [const N: usize] Cow<'a, [A]>, &mut [B; N], [B; N]: LengthAtMost32 }
/// Implements comparison of vectors, lexicographically.
#[stable(feature = "rust1", since = "1.0.0")]