Mastering Blockchain Programming with Solidity

ERC721 inherits from IERC721

As we have seen in the previous inheritance graph, the ERC721 contract inherits from IERC721. The IERC721 is the interface definition present in the OpenZeppelin library. The contract defines all basic events and functions that the ERC721 NFT standard constitutes. The IERC721 interface also inherits from IERC165, which also contains the interface definition for ERC165 standard interface detection. The following is the contract inheritance of IERC721.sol:

contract IERC721 is IERC165 {

This interface is defined as the preceding preset in the OpenZeppelin source code. We looked into the ERC721 interface graph and the corresponding contracts it inherits from; now, let's look into the different state variables present ...