pub fn size_of_val<T>(val: &T) -> usize where T: ?Sized,
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.
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));
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Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/mem/fn.size_of_val.html