Custom derive for ink_storage traits.

This crate provides helpers to define your very own custom storage data structures that work along the ink_storage data structures by implementing SpreadLayout and PackedLayout traits.

See Spread vs. Packed for more details of these two root strategies.

Examples

use ink_storage::traits::{SpreadLayout, push_spread_root};
use ink_primitives::Key;

# ink_env::test::run_test::<ink_env::DefaultEnvironment, _>(|_| {
// Enum
#[derive(SpreadLayout)]
enum Vote {
Yes,
No
}

// Strucut
#[derive(SpreadLayout)]
struct NamedFields {
a: u32,
b: [u32; 32],
};

// Created a custom structure and told which key to update.
push_spread_root(&NamedFields{ a: 123, b: [22; 32] }, &mut Key::from([0x42; 32]));
# Ok(())
# });