pragma solidity ^0.5.0;

contract Proxiable {
    // Code position in storage is keccak256("PROXIABLE") = "0xc5f16f0fcc639fa48a6947836d9850f504798523bf8c9a3a87d5876cf622bcf7"

    function updateCodeAddress(address newAddress) internal {
        require(
            bytes32(
                    0xc5f16f0fcc639fa48a6947836d9850f504798523bf8c9a3a87d5876cf622bcf7
                ) ==
                Proxiable(newAddress).proxiableUUID(),
            "Not compatible"
        );
        assembly {
            // solium-disable-line
            sstore(
                0xc5f16f0fcc639fa48a6947836d9850f504798523bf8c9a3a87d5876cf622bcf7,
                newAddress
            )
        }
    }
    function proxiableUUID() public pure returns (bytes32) {
        return
            0xc5f16f0fcc639fa48a6947836d9850f504798523bf8c9a3a87d5876cf622bcf7;
    }
}