// SPDX-License-Identifier: Proprietary

pragma solidity ^0.7.2;

/**
    Manager can call administrative functions on the contract and is a fee
    collector.
 */
contract Managed {
    address public manager;

    event ManagershipTransferred(address indexed from, address indexed to);

    modifier onlyManager {
        require(manager == msg.sender, "Not manager");
        _;
    }

    function setManager(address newManager) public onlyManager {
        require(newManager != address(0), "0 manager disallowed");
        emit ManagershipTransferred(manager, newManager);
        manager = newManager;
    }
}