//This is an abstract base class because it is not implemented

// BaseAuction.sol
pragma solidity ^0.4.25;

contract BaseAuction {
    address public owner;

    modifier ownerOnly() {
        require(msg.sender == owner);
        _;
    }
    //Events log information and allow applications to listen
    //to whats happening
    event AuctionComplete(address winner, uint bid);
    event BidAccepted(address bidder, uint bid);

    constructor() public {
        owner = msg.sender;
    }

    function bid() external payable;
    function end() external;
}