openzeppelin-contracts/contracts/access/roles/CapperRole.sol

pragma solidity ^0.5.2;

import "@openzeppelin/upgrades/contracts/Initializable.sol";

import "../../GSN/Context.sol";
import "../Roles.sol";

contract CapperRole is Initializable, Context {
    using Roles for Roles.Role;

    event CapperAdded(address indexed account);
    event CapperRemoved(address indexed account);

    Roles.Role private _cappers;

    function initialize(address sender) public initializer {
        if (!isCapper(sender)) {
            _addCapper(sender);
        }
    }

    modifier onlyCapper() {
        require(isCapper(_msgSender()), "CapperRole: caller does not have the Capper role");
        _;
    }

    function isCapper(address account) public view returns (bool) {
        return _cappers.has(account);
    }

    function addCapper(address account) public onlyCapper {
        _addCapper(account);
    }

    function renounceCapper() public {
        _removeCapper(_msgSender());
    }

    function _addCapper(address account) internal {
        _cappers.add(account);
        emit CapperAdded(account);
    }

    function _removeCapper(address account) internal {
        _cappers.remove(account);
        emit CapperRemoved(account);
    }

    uint256[50] private ______gap;
}