Hi Everyone, I’m trying to use an ERC721 token in an election application. I’ve been tracing through the ERC721PresetMinterPauserAutoId contract and inherited contracts to understand how everything is connected and functions. I’m stuck on _beforeTokenTransfer. The function is described in the docu…

Hi @cjd9s , Welcome to the community :wave: Hooks allow you lots of flexibility in modifying the behaviour of a token by allowing you to execute functionality, in the case of the _beforeTokenTransfer hook, you can execute functionality before the token is transferred. You could restrict transfer (…

Hi Andrew, I really appreciate the response. I now understand that the _beforeTokenTransfer function is empty on purpose. It’s up to me to implement or not implement that function. Relatedly, the documentation that I linked in the original post describes calling conditions for _beforeTokenTransfe…

[image] cjd9s: Is it fair to compare hooks to function modifiers? The difference being that while function modifiers can only be placed before or after the function body, hooks can be place anywhere in the function body? Is that an oversimplification? They both can be used to modifiy behavior…

Hi Andrew, Did you mean to write more about modifiers? Cheers. Sincerely, Craig

Hi @cjd9s , Only a sentence more. :smile:

How to use _beforeTokenTransfer when extending ERC721PresetMinterPauserAutoId contract?

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ERC20PresetMinterPauser.sol _beforeTokenTransfer() Hook Utility Contracts	7	1270	July 16, 2020
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How to use _beforeTokenTransfer when extending ERC721PresetMinterPauserAutoId contract?

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