pragma solidity ^0.5.0;

// NOTE:
// This code has been taken from this blogpost by Alan Lu:
// Lu: https://blog.gnosis.pm/solidity-delegateproxy-contracts-e09957d0f201


contract ProxyData {
    address internal proxied;
}


contract Proxy is ProxyData {
    constructor(address _proxied) public {
        proxied = _proxied;
    }

    function () external payable {
        address addr = proxied;
        assembly {
            let freememstart := mload(0x40)
                calldatacopy(freememstart, 0, calldatasize())

                let success := delegatecall(not(0), addr, freememstart, calldatasize(), freememstart, 0)
                returndatacopy(freememstart, 0, returndatasize())
                switch success
                    case 0 { revert(freememstart, returndatasize()) }
            default { return(freememstart, returndatasize()) }
        }
    }
}