auto client = new TCPClient(Endpoint(18800, "127.0.0.1"));
// sync request
auto num = client.call!ulong("sum", 1, 2);
// async request: return a Future object
auto future = client.callAsync("sum", 1, 2);
// notify
client.notify("hello", "hoge");

class FooServer
{
    ulong sum(ulong l, ulong r)
    {
        return l + r;
    }
    void hello(string msg)
    {   
        writeln(msg);
    }
}
// TCPServer or UDPServer
auto server = new TCPServer!(FooServer)(new FooServer);
server.listen(Endpoint(18800, "127.0.0.1"));
server.start();

module foo;
ulong sum(ulong l, ulong r)
{
    return l + r;
}
void hello(string msg)
{   
    writeln(msg);
}
auto server = new TCPServer!(foo)();
// same as Object