// Brought from https://github.com/aragon/aragonOS/blob/v4.3.0/contracts/common/Uint256Helpers.sol
// Adapted to use pragma ^0.5.8 and satisfy our linter rules

pragma solidity ^0.5.8;


library Uint256Helpers {
    uint256 private constant MAX_UINT8 = uint8(-1);
    uint256 private constant MAX_UINT64 = uint64(-1);

    string private constant ERROR_UINT8_NUMBER_TOO_BIG = "UINT8_NUMBER_TOO_BIG";
    string private constant ERROR_UINT64_NUMBER_TOO_BIG = "UINT64_NUMBER_TOO_BIG";

    function toUint8(uint256 a) internal pure returns (uint8) {
        require(a <= MAX_UINT8, ERROR_UINT8_NUMBER_TOO_BIG);
        return uint8(a);
    }

    function toUint64(uint256 a) internal pure returns (uint64) {
        require(a <= MAX_UINT64, ERROR_UINT64_NUMBER_TOO_BIG);
        return uint64(a);
    }
}