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Offset from (#705)

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This commit is contained in:
Brad Dunbar
2024-05-11 19:41:50 +02:00
committed by GitHub
parent 86694b0564
commit 4950c50376
3 changed files with 20 additions and 39 deletions
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src/bytes_mut.rs
+1 -18
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@@ -17,7 +17,7 @@ use crate::bytes::Vtable;
#[allow(unused)]
use crate::loom::sync::atomic::AtomicMut;
use crate::loom::sync::atomic::{AtomicPtr, AtomicUsize, Ordering};
use crate::{Buf, BufMut, Bytes};
use crate::{offset_from, Buf, BufMut, Bytes};
/// A unique reference to a contiguous slice of memory.
///
@@ -1683,23 +1683,6 @@ fn invalid_ptr<T>(addr: usize) -> *mut T {
ptr.cast::<T>()
}
/// Precondition: dst >= original
///
/// The following line is equivalent to:
///
/// ```rust,ignore
/// self.ptr.as_ptr().offset_from(ptr) as usize;
/// ```
///
/// But due to min rust is 1.39 and it is only stabilized
/// in 1.47, we cannot use it.
#[inline]
fn offset_from(dst: *mut u8, original: *mut u8) -> usize {
debug_assert!(dst >= original);
dst as usize - original as usize
}
unsafe fn rebuild_vec(ptr: *mut u8, mut len: usize, mut cap: usize, off: usize) -> Vec<u8> {
let ptr = ptr.sub(off);
len += off;