# Function std::ptr::slice_from_raw_parts_mut

1.42.0 (const: unstable) · source ·

    pub fn slice_from_raw_parts_mut<T>(data: *mut T, len: usize) -> *mut [T]

Expand description

Performs the same functionality as `slice_from_raw_parts`, except that a raw mutable slice is returned, as opposed to a raw immutable slice.

See the documentation of `slice_from_raw_parts` for more details.

This function is safe, but actually using the return value is unsafe. See the documentation of `slice::from_raw_parts_mut` for slice safety requirements.

## Examples

    use std::ptr;

    let x = &mut [5, 6, 7];
    let raw_pointer = x.as_mut_ptr();
    let slice = ptr::slice_from_raw_parts_mut(raw_pointer, 3);

    unsafe {
        (*slice)[2] = 99; // assign a value at an index in the slice
    };

    assert_eq!(unsafe { &*slice }[2], 99);

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