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// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.6.12;
interface IZeroEx {
    function getFunctionImplementation(bytes4 _signature) external returns (address);
}// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;
import "./IZeroEx.sol";
import "@0x/contracts-utils/contracts/src/v06/LibBytesV06.sol";
import "@0x/contracts-zero-ex/contracts/src/errors/LibProxyRichErrors.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
/// @title Coinbase proxy contract for 0x proxy
/// @dev A generic proxy contract which extracts a fee before delegation
contract ZeroExProxy is Ownable {
    using LibBytesV06 for bytes;
    using SafeERC20 for IERC20;
    using SafeMath for uint256;
    address private constant _ETH_ADDRESS = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
    address private constant _NULL_ADDRESS = 0x0000000000000000000000000000000000000000;
    address payable private _beneficiary;
    address payable private _allowanceTarget;
    IZeroEx private _zeroEx;
    mapping(bytes4 => address) private _implementationOverrides;
    event BeneficiaryChanged(address indexed beneficiary);
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