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specialize zip: Implement TrustedRandomAccess for slice iterators

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This commit is contained in:
Ulrik Sverdrup 2016-04-21 21:35:39 +02:00
parent f8d2fdf02b
commit 592eaa5bb3
1 changed files with 15 additions and 0 deletions
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15
src/libcore/slice.rs
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@ -50,6 +50,7 @@ use result::Result::{Ok, Err};
use ptr; use ptr;
use mem; use mem;
use marker::{Copy, Send, Sync, self}; use marker::{Copy, Send, Sync, self};
use iter_private::TrustedRandomAccess;
#[repr(C)] #[repr(C)]
struct Repr<T> { struct Repr<T> {
@ -1942,3 +1943,17 @@ macro_rules! impl_marker_for {
impl_marker_for!(BytewiseEquality, impl_marker_for!(BytewiseEquality,
u8 i8 u16 i16 u32 i32 u64 i64 usize isize char bool); u8 i8 u16 i16 u32 i32 u64 i64 usize isize char bool);
#[doc(hidden)]
unsafe impl<'a, T> TrustedRandomAccess for Iter<'a, T> {
unsafe fn get_unchecked(&mut self, i: usize) -> &'a T {
&*self.ptr.offset(i as isize)
}
}
#[doc(hidden)]
unsafe impl<'a, T> TrustedRandomAccess for IterMut<'a, T> {
unsafe fn get_unchecked(&mut self, i: usize) -> &'a mut T {
&mut *self.ptr.offset(i as isize)
}
}