// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import {ERC4907AUpgradeable} from './ERC4907AUpgradeable.sol';

library ERC4907AStorage {
    struct Layout {
        // Mapping from token ID to user info.
        //
        // Bits Layout:
        // - [0..159]   `user`
        // - [160..223] `expires`
        mapping(uint256 => uint256) _packedUserInfo;
    }

    bytes32 internal constant STORAGE_SLOT = keccak256('ERC721A.contracts.storage.ERC4907A');

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