Why have the _beforeTokenTransfer and _afterTokenTransfer functions been removed in the ERC721 standard in v5?

Cainuriel · November 10, 2023, 11:46am

In version v4 we have the following functions for the ERC721:

There are the functions for "to do something" before and after a transfer.

They do not appear in the new v5 version:

Then,
If I want to use that functions, which standard should I use?

Zartaj · November 10, 2023, 2:33pm

Now there's only one function _update()

You can override this function and add you logic

github.com

OpenZeppelin/openzeppelin-contracts/blob/7de6fd4a2604764497990bcc0013f95763713190/contracts/token/ERC20/ERC20.sol#L188


      
              _update(from, to, value);
          }
          
          /**
           * @dev Transfers a `value` amount of tokens from `from` to `to`, or alternatively mints (or burns) if `from`
           * (or `to`) is the zero address. All customizations to transfers, mints, and burns should be done by overriding
           * this function.
           *
           * Emits a {Transfer} event.
           */
          function _update(address from, address to, uint256 value) internal virtual {
              if (from == address(0)) {
                  // Overflow check required: The rest of the code assumes that totalSupply never overflows
                  _totalSupply += value;
              } else {
                  uint256 fromBalance = _balances[from];
                  if (fromBalance < value) {
                      revert ERC20InsufficientBalance(from, fromBalance, value);
                  }
                  unchecked {
                      // Overflow not possible: value <= fromBalance <= totalSupply.

Cainuriel · November 11, 2023, 12:00pm

Ok, I add my logic without deleting this content you show me or is nenessary to save it?

Other question.
When is this function triggered? Before or after the transfer?

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Why have the _beforeTokenTransfer and _afterTokenTransfer functions been removed in the ERC721 standard in v5?

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