Function size_of_val 

pub const fn size_of_val<T: ?Sized>(val: &T) -> usize

This item is validated for IEC 61508 (SIL 2) and ISO 26262 (ASIL B).

Returns the size of the pointed-to value in bytes.

This is usually the same as size_of::<T>(). However, when T has no statically-known size, e.g., a slice [T] or a trait object, then size_of_val can be used to get the dynamically-known size.

Examples

assert_eq!(4, size_of_val(&5i32));

let x: [u8; 13] = [0; 13];
let y: &[u8] = &x;
assert_eq!(13, size_of_val(y));