int FtpAsyncGet(const String& remote_file, const String& local_file, const String& host, int port = 21, const String& user = Null,
        const String& pass = Null, Event<int, int, String, int64, int64> progress = CNULL, bool active = false, bool ssl = false, 
        bool ascii = false);

FtpAsyncGet("remote.txt", "local.txt", "locaclhost, 21, Null, Null, CNull, false, false, true);

int FtpAsyncGet(const FtpAssyncRequestConfig& config);

FtpAsyncGet(FtpAssyncRequestConfig("remote.txt", "local.txt", "locaclhost.txt").EnableAscii());

class FtpAssyncRequestConfig final
{
public:
    FtpAssyncRequestConfig(const String& remote_file, const String& local_file, const String& host)
        : // initialization ...
    {}

    // Get, Set, Enable interface...

private:
    // private members
};