Type Alias OptionalPtrMut 

pub type OptionalPtrMut<T> = OptZero<RequiredPtrMut<T>>;

A nullable muttable pointer to T

guaranteed to be accepted by the syscall if it is null, however the syscall will return ErrorStatus::InvalidPtr if it is not aligned to align_of::<T>()

this is typically for the syscall to return optional values

Aliased Type

pub struct OptionalPtrMut<T>(/* private fields */);