Blockchain By Example

Canceling an auction

Wouldn't it be logical to enable the auction owner to cancel the auction?

Such a function should be executed exclusively by the auction owner, while the auction is still open; thus, we use the modifiers only_owner and an_ongoing_auction:

function cancel_auction() only_owner an_ongoing_auction returns (bool) {    STATE = auction_state.CANCELLED;    CanceledEvent("Auction Cancelled", now);    return true;}

This function will change the state of the auction status to Cancelled, using the enum value auction_state.CANCELLED we defined earlier, and the event CanceledEvent will be fired announcing the auction cancellation.