Function cast_init 

pub const unsafe fn cast_init<T, U, E>(init: impl Init<T, E>) -> impl Init<U, E>

Changes the to be initialized type.

Safety

• *mut U must be castable to *mut T and any value of type T written through such a pointer must result in a valid U.

• The pointer of type U can be castbale to type T , and any value of type T written through such a pointer must result in a valid value.