Type Alias PartialOrdFnWide 

pub type PartialOrdFnWide = for<'l, 'r> unsafe fn(left: PtrConstWide<'l>, right: PtrConstWide<'r>) -> Option<Ordering>;

Function to compare two values and return their ordering if comparable (wide pointer version)

Safety

Both left and right parameters must point to aligned, initialized memory of the correct type.