Function bitvec::slice::from_raw_parts [−][src]
pub unsafe fn from_raw_parts<'a, O, T>(
data: *const T,
len: usize
) -> &'a BitSlice<O, T> where
O: BitOrder,
T: 'a + BitStore,
Forms a bit slice from a pointer and a length.
The len argument is the number of elements, not the number of bits.
Safety
This function is unsafe as there is no guarantee that the given pointer is valid
for len elements, nor whether the lifetime inferred is a suitable lifetime for
the returned slice.
data must be non-null and aligned, even for zero-length slices. This is due to
requirements in the bitvec data structure operations. You can obtain a pointer
that is usable as data for zero-length slices from NonNull::dangling().
The total size of the bit slice must be no larger than BitPtr::<T>::MAX_BITS
bits in memory. See the safety documentation of BitPtr (if available).
Caveat
The lifetime for the returned slice is inferred from its usage. To prevent accidental misuse, it’s suggested to tie the lifetime to whichever source lifetime is safe in the context, such as by providing a helper function taking the lifetime of a host value for the slice, or by explicit annotation.
Original
Examples
use bitvec::slice as bitslice; // manifest a slice for a single element let x = 42u8; // 0b0010_1010 let ptr = &x as *const _; let bitslice = unsafe { bitslice::from_raw_parts::<Msb0, _>(ptr, 1) }; assert!(bitslice[2]);