Attribute Macro brush_lang::storage

#[storage]

That macro implemented SpreadLayout, SpreadAllocate and StorageLayout with a specified storage key instead of the default one(All data is stored under the provided storage key).

Also, that macro adds the code to initialize the structure if it wasn’t initialized. That macro requires one input argument - the storage key. It can be any Rust code that returns [u8; 32].

Example:

{
use brush::traits::AccountId;
pub const STORAGE_KEY: [u8; 32] = ink_lang::blake2x256!("brush::OwnableData");

#[derive(Default, Debug)]
#[brush::storage(STORAGE_KEY)]
pub struct OwnableData {
   pub owner: AccountId,
   pub _reserved: Option<()>,
}

#[derive(Default, Debug)]
#[brush::storage(ink_lang::blake2x256!("brush::ProxyData"))]
pub struct ProxyData {
   pub forward: AccountId,
   pub _reserved: Option<()>,
}

}