Derive Macro Storable 

#[derive(Storable)]
{
    // Attributes available to this derive:
    #[storable_arrays]
}

Derives the Storable trait for structs with named fields.

This macro generates implementations for loading and storing multi-slot struct layout in EVM storage. Its packing and encoding schemes aim to be an exact representation of the storage model used by Solidity.

Requirements

• The struct must have named fields (not tuple structs or unit structs)
• All fields must implement the Storable trait

Generated Code

For each struct field, the macro generates sequential slot offsets. It implements the Storable trait methods:

• load - Loads the struct from storage
• store - Stores the struct to storage
• delete - Uses default implementation (sets all slots to zero)

Example

use precompiles::storage::Storable;
use alloy_primitives::{Address, U256};

#[derive(Storable)]
pub struct RewardStream {
    pub funder: Address,              // rel slot: 0 (20 bytes)
    pub start_time: u64,              // rel slot: 0 (8 bytes)
    pub end_time: u64,                // rel slot: 1 (8 bytes)
    pub rate_per_second_scaled: U256, // rel slot: 2 (32 bytes)
    pub amount_total: U256,           // rel slot: 3 (32 bytes)
}