RMRK checkForInheritanceLoop function

checkForInheritanceLoop.sol

pragma solidity ^0.8.15;
    
uint256 private constant _MAX_LEVELS_TO_CHECK_FOR_INHERITANCE_LOOP = 100;

function _checkForInheritanceLoop(
    uint256 currentId,
    address targetContract,
    uint256 targetId
) private view {
    for (uint256 i; i < _MAX_LEVELS_TO_CHECK_FOR_INHERITANCE_LOOP; ) {
        (
            address nextOwner,
            uint256 nextOwnerTokenId,
            bool isNft
        ) = IRMRKNesting(targetContract).rmrkOwnerOf(targetId);
        // If there's a final address, we're good. There's no loop.
        if (!isNft) {
            return;
        }
        // Ff the current nft is an ancestor at some point, there is an inheritance loop
        if (nextOwner == address(this) && nextOwnerTokenId == currentId) {
            revert RMRKNestingTransferToDescendant();
        }
        // We reuse the parameters to save some contract size
        targetContract = nextOwner;
        targetId = nextOwnerTokenId;
        unchecked {
            ++i;
        }
    }
    revert RMRKNestingTooDeep();
}