How to pass a function as an parameter to a contract in solidity - solidity

Question

I'm trying to make a dynamic rule builder in solidity, I have a role manager contract that looks like so:
import "#openzeppelin/contracts/access/Ownable.sol";
// The Ownable contract to manage the contract owner
contract RoleManager is Ownable {
mapping(bytes32 => function(bytes32, address, address[] memory, uint256[] memory, bytes[] memory, string memory) external view returns (bool)) public rules;
// Set the rule for the given role
function setRule(bytes32 role, function(bytes32, address, address[] memory, uint256[] memory, bytes[] memory, string memory) external view returns (bool) rule) public onlyOwner {
rules[role] = rule;
}
//...
}
Maybe my understanding of what function parameter is wrong, I would like to build a dynamic function, How to I generate a function on ethers to pass to this ?

Answer 1

Use interface :
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;
import "#openzeppelin/contracts/access/Ownable.sol";
interface IRule {
function rule (bytes32 data, address addr,
address[] memory addrArr, uint256[] memory uintArr,
bytes[] memory dataArr, string memory str)
external view returns (bool);
}
contract Demo is Ownable {
mapping(bytes32 => IRule) public rules;
function setRule(bytes32 role, IRule rule) public onlyOwner {
rules[role] = rule;
}
}