// SPDX-License-Identifier: MIT
pragma solidity ^0.8.23;

// interfaces

// libraries

// contracts

library ImplementationRegistryStorage {
    // keccak256(abi.encode(uint256(keccak256("factory.facets.registry.storage")) - 1)) &
    // ~bytes32(uint256(0xff))
    bytes32 internal constant STORAGE_SLOT =
        0x31d1d65d94f3e9d7ffc7a93cc3bd1ee24d47f432e2c4fc10a5d92f8e2dd98900;

    struct Layout {
        mapping(address => bool) approved;
        mapping(bytes32 => uint32) currentVersion;
        mapping(bytes32 => mapping(uint32 => address)) implementation;
    }

    function layout() internal pure returns (Layout storage ds) {
        bytes32 slot = STORAGE_SLOT;
        assembly {
            ds.slot := slot
        }
    }
}