Type Alias HashFn 

pub type HashFn = for<'mem> unsafe fn(OpaqueConst<'mem>, Opaque<'mem>, for<'mem> unsafe fn(Opaque<'mem>, &[u8]));

Function to hash a value

Safety

The value parameter must point to aligned, initialized memory of the correct type. The hasher pointer must be a valid pointer to a Hasher trait object.