Implementing ERC2981.sol in an ERC721 contract

Smart Contracts
1

Hey folks,

I'm learning and experimenting with NFT royalties, for example, something like this:

    // SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC721/ERC721.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/access/Ownable.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/common/ERC2981.sol";

contract MyToken is ERC721, Ownable, ERC2981 {
    constructor() ERC721("MyToken", "MTK") {}

    function safeMint(address to, uint256 tokenId) public onlyOwner {
        _safeMint(to, tokenId);
    }
}

this does not work though, I get:

Derived contract must override function "supportsInterface". Two or more base classes define function with same name and parameter types.

What would that function look like?

Thanks!

2

There is an implementation of ERC2981 on a ERC721, in there you can see that you would just need to override it like this:

/**
 * @dev See {IERC165-supportsInterface}.
 */
function supportsInterface(bytes4 interfaceId) public view virtual override(ERC721, ERC2981) returns (bool) {
    return super.supportsInterface(interfaceId);
}
3

oh great!
How did I miss that? lol
Thanks!