Macro erdos::connect_1_write

macro_rules! connect_1_write {
    ($t:ty, $config:expr) => { ... };
    ($t:ty, $config:expr, $($s:ident),+) => { ... };
}

Connects read streams to an operator that writes on 1 stream.

Use: let read_stream_3 = connect_3_write!(MyOp, arg, read_stream_1, read_stream_2, ...);