Function abi_stable::utils::distance_from

pub fn distance_from<T>(from: *const T, to: *const T) -> Option<usize>

This function allows calculating the distance (in Ts) from from to to.

This returns None if from has a higher address than to, or if T is a zero sized type.

Example

use abi_stable::utils;
 
let arr=["hello","world","foo","bar","baz"];
 
assert_eq!(utils::distance_from(&arr[0],&arr[0]),Some(0));
assert_eq!(utils::distance_from(&arr[0],&arr[4]),Some(4));

assert_eq!(utils::distance_from(&arr[4],&arr[0]),None);