Derive Macro ink_storage_derive::PackedLayout

#[derive(PackedLayout)]

Derives ink_storage’s PackedLayout trait for the given struct or enum.

Examples

use scale::{Encode, Decode};
use ink_primitives::Key;
use ink_storage::traits::{
    SpreadLayout,
    PackedLayout,
    push_packed_root,
    pull_packed_root
};

#[derive(Encode, Decode, SpreadLayout, PackedLayout)]
struct NamedFields {
    a: u32,
    b: [u32; 32],
}

let mut value = NamedFields {
    a: 123,
    b: [22; 32],
};

push_packed_root(&value, &mut Key::from([0x42; 32]));
let value2: NamedFields = pull_packed_root(&mut Key::from([0x42; 32]));
assert_eq!(value.a, value2.a);