Source

HASH-ROLE GENERATOR

another usecase for bitwise operator in solidity programming in ROLE base smartcontract's.

what is

in this example, developer can set user role easily.

where to use, any smartcontract like CRUD dapp's.

• example hashes

ADMIN_ROLE:      0x405787fa12a823e0f2b7631cc41b3ba8828b3321ca811111fa75cd3aa3bb5ace
VICE_ROLE:       0x8a35acfbc15ff81a39ae7d344fd709f28e8600b4aa8c65c6b64bfe7fe36bd19b
MODERATOR_ROLE:  0xf3f7a9fe364faab93b216da50a3214154f22a0a2b415b23a84c8169e8b636ee3

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Review

• SmartContract

uint private immutable ADMIN_ROLE;      // = tmp << 1;
uint private immutable VICE_ROLE;       // = tmp << 2;
uint private immutable MODERATOR_ROLE;  // = tmp << 3;

function shiftLeft(uint x, uint bits) internal pure returns (uint y) {
    uint nonce = x << bits;
    y = keccak256(abi.encodePacked(nonce));
}