from_raw_parts_mut in core::slice - Rust (original) (raw)

Function from_raw_parts_mut

1.6.0 (const: 1.83.0) · Source

pub const unsafe fn from_raw_parts_mut<'a, T>(
    data: *mut T,
    len: usize,
) -> &'a mut [T]

Expand description

Performs the same functionality as from_raw_parts, except that a mutable slice is returned.

§Safety

Behavior is undefined if any of the following conditions are violated:

• data must be non-null, valid for both reads and writes for len * size_of::<T>() many bytes, and it must be properly aligned. This means in particular:
  • The entire memory range of this slice must be contained within a single allocated object! Slices can never span across multiple allocated objects.
  • data must be non-null and aligned even for zero-length slices or slices of ZSTs. One reason for this is that enum layout optimizations may rely on references (including slices of any length) being aligned and non-null to distinguish them from other data. You can obtain a pointer that is usable as datafor zero-length slices using NonNull::dangling().
• data must point to len consecutive properly initialized values of type T.
• The memory referenced by the returned slice must not be accessed through any other pointer (not derived from the return value) for the duration of lifetime 'a. Both read and write accesses are forbidden.
• The total size len * size_of::<T>() of the slice must be no larger than isize::MAX, and adding that size to data must not “wrap around” the address space. See the safety documentation of pointer::offset.