contract TransferController {
    //
    // Events
    // -----------------------------------------------------------------------------------------------------------------
    event CurrencyTransferred(address from, address to, uint256 value,
        address currencyCt, uint256 currencyId);

    //
    // Functions
    // -----------------------------------------------------------------------------------------------------------------
    function isFungible()
    public
    view
    returns (bool);

    function standard()
    public
    view
    returns (string memory);

    /// @notice MUST be called with DELEGATECALL
    function receive(address from, address to, uint256 value, address currencyCt, uint256 currencyId)
    public;

    /// @notice MUST be called with DELEGATECALL
    function approve(address to, uint256 value, address currencyCt, uint256 currencyId)
    public;

    /// @notice MUST be called with DELEGATECALL
    function dispatch(address from, address to, uint256 value, address currencyCt, uint256 currencyId)
    public;

    //----------------------------------------

    function getReceiveSignature()
    public
    pure
    returns (bytes4)
    {
        return bytes4(keccak256("receive(address,address,uint256,address,uint256)"));
    }

    function getApproveSignature()
    public
    pure
    returns (bytes4)
    {
        return bytes4(keccak256("approve(address,uint256,address,uint256)"));
    }

    function getDispatchSignature()
    public
    pure
    returns (bytes4)
    {
        return bytes4(keccak256("dispatch(address,address,uint256,address,uint256)"));
    }
}
/**
 * @title TransferController
 * @notice A base contract to handle transfers of different currency types
 */
function dispatch(address from, address to, uint256 value, address currencyCt, uint256 currencyId)
public;

/// @notice MUST be called with DELEGATECALL