ERC721.sol

https://docs.openzeppelin.com/contracts/3.x/erc721#constructing_an_erc721_token_contract

Why are there 2 functions named _safeMint?

  • You can have multiple functions with the same name, as long as their signature is not the same.

  • Function parameters are also part of the signature, so the function signature of these two functions are different. Hence, they do not get mixed up in any way.

  • Whenever you call a contract function, you have to provide the parameters as well. The executed function is chosen based on the name and provided parameters.

  • The first function is just a shorthand version of the second hand, since it calls the second function.

    • it makes the "data" field optional by using overloading - if data is included, it'll use the 4-arg version, if it's not included, it'll call the three-arg version, which in turn just puts in an empty string for data calling the 4-arg version

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