The complete transferPunk Function

There are a couple more things to fix/add to our transferPunk() function. Let's look at the complete code and go through it line by line:

// Transfer ownership of a punk to another user without requiring paymentfunction transferPunk(address to, uint punkIndex) {  // If not all punks are handed out, throw an error  if (!allPunksAssigned) throw;  // Throw an error if called by anyone but the punk owner  if (punkIndexToAddress[punkIndex] != msg.sender) throw;    // Our contract only allows managing punks #0 – #9,999  if (punkIndex >= 10000) throw;    // Clear the open sell Offer if there is one  if (punksOfferedForSale[punkIndex].isForSale) {    punkNoLongerForSale(punkIndex);  }  // Assign the new owner  punkIndexToAddress[punkIndex] = to;  // Remove the punk from the total balance of the previous owner  balanceOf[msg.sender]--;  // Add the punk to the total balance of the new owner  balanceOf[to]++;  // Let outside applications know of the transfer by emitting an Event  Transfer(msg.sender, to, 1); // Emit a Transfer event that's backwards compatible with ERC20 tokens  PunkTransfer(msg.sender, to, punkIndex);  // Check for the case where there is a bid from the new owner and refund it.  // Any other bid can stay in place.  Bid bid = punkBids[punkIndex];  if (bid.bidder == to) {    // Kill bid and refund value    pendingWithdrawals[to] += bid.value;    punkBids[punkIndex] = Bid(false, punkIndex, 0x0, 0);  }}

There is a couple new points here we haven't discussed:

• Don't allow transfers if not all punks are handed out yet.
• Prevent owners from bidding on their punks (by buying a punk they already bid on).

We'll touch on both of these things in more detail when we cover the initial distribution and Bids in general.

To be continued...