An Wx.T is an in-memory, append-only buffer. It's cheaper to write strings and numbers to an Wx.T than a Wr.T.

It's an unchecked runtime error to concurrently call procedures in this interface on a single Wx.T.

INTERFACE Wx;

IMPORT Wr, Thread, TCP;

TYPE
  T <: T_; T_ = OBJECT
  METHODS
    init    (drain: TCP.T): T;
    flush   ()                            RAISES {Wr.Failure, Thread.Alerted};
    put     (a, b, c, d: TEXT := NIL)     RAISES {Wr.Failure, Thread.Alerted};
    putChar (ch: CHAR)                    RAISES {Wr.Failure, Thread.Alerted};
    putInt  (i: INTEGER)                  RAISES {Wr.Failure, Thread.Alerted};
    putStr  (READONLY x: ARRAY OF CHAR)   RAISES {Wr.Failure, Thread.Alerted};
    putSub  (txt: TEXT;  start: INTEGER;  len := LAST(INTEGER))
                                          RAISES {Wr.Failure, Thread.Alerted};
    toText  (): TEXT;
  END;

END Wx.

Given a Wx.T or writer wx,

wx.init(t) drops whatever is in wx's internal buffer and attaches the drain t. If t is NIL, wx will accumulate everything that it receives. Otherwise, when its internal buffer fills, t.put will be called to empty the buffer.

wx.flush() empties wx's internal buffer to its attached drain.

wx.put... writes data to wx's internal buffer.

wx.toText() returns the accumulated contents of wx's buffer. If wx has a non-NIL drain attached the contents of the buffer are unpredictable.