pragma solidity ^0.5.2;

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

import "./RefundableCrowdsale.sol";
import "./PostDeliveryCrowdsale.sol";

/**
 * @title RefundablePostDeliveryCrowdsale
 * @dev Extension of RefundableCrowdsale contract that only delivers the tokens
 * once the crowdsale has closed and the goal met, preventing refunds to be issued
 * to token holders.
 */
contract RefundablePostDeliveryCrowdsale is Initializable, RefundableCrowdsale, PostDeliveryCrowdsale {
    function withdrawTokens(address beneficiary) public {
        require(finalized());
        require(goalReached());

        super.withdrawTokens(beneficiary);
    }

    uint256[50] private ______gap;
}
