Delegatecall.sol

contract DelegateCaller {
  uint public n;
  address public sender;

  function delegatecallSetN(address _e, uint _n) {
    _e.delegatecall(bytes4(keccak256("setN(uint256)")), _n); // D's storage is set, E is not modified 
  }
}

contract OuterContract {
  uint public n;
  address public sender;
  
  function setN(uint _n) {
    n = _n;
    sender = msg.sender;
  }
}