@fantastic-solidity/contracts v0.1.3

TransferChecker

inherit ERC20TransferChecker

import "@fantastic-solidity/contracts/ERC20TransferChecker.sol";

contract Token is ERC20, Ownerable, ERC20TransferChecker {

    // set with access controll
    function setTransferChecker(address transferChecker) public onlyOwner {
        _setTransferChecker(transferChecker);
    }

    // override hook
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal override {
        super._beforeTokenTransfer(from, to, amount);
        _checkTransfer(from, to, amount);
    }
}

implement ITransferChecker

contract TokenTransferChecker is ITransferChecker{

    // your logic here
    function checkTransfer(address from, address to, uint256 amount) public override{
        revert("can not transfer");
    }
}