block3.solidity

pragma solidity ^ 0.5.2;

import "openzeppelin-solidity/contracts/access/Roles.sol";

contract someRoles {
  using Roles for Roles.Role;

  Roles.Role private roleOne;

  function onlyRoleOne() public {
    //only roleOne can use this function
    require(roleOne.has(msg.sender), "You must be roleOne");
  }

  function anyone() public {
    //anyone can use this function
  }

}