Function std::mem::size_of_val
1.0.0 (const: unstable) · source · pub fn size_of_val<T>(val: &T) -> usizewhere
T: ?Sized,
Expand description
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
use std::mem;
assert_eq!(4, mem::size_of_val(&5i32));
let x: [u8; 13] = [0; 13];
let y: &[u8] = &x;
assert_eq!(13, mem::size_of_val(y));
Run