(*
    Title:      Standard Basis Library: Imperative IO Signature
    Copyright   David C.J. Matthews 2000

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.
    
    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.
    
    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*)

(* G&R 2004 status: checked, no change *)

signature IMPERATIVE_IO =
sig
    structure StreamIO : STREAM_IO
    type vector = StreamIO.vector
    type elem = StreamIO.elem

    type instream
    type outstream
    val input : instream -> vector
    val input1 : instream -> elem Option.option
    val inputN : instream * int -> vector
    val inputAll : instream -> vector
    val canInput : instream * int -> int Option.option
    val lookahead : instream -> elem Option.option
    val closeIn : instream -> unit
    val endOfStream : instream -> bool
    val output : outstream * vector -> unit
    val output1 : outstream * elem -> unit
    val flushOut : outstream -> unit
    val closeOut : outstream -> unit
    val mkInstream : StreamIO.instream -> instream
    val getInstream : instream -> StreamIO.instream
    val setInstream : instream * StreamIO.instream -> unit
    val mkOutstream : StreamIO.outstream -> outstream
    val getOutstream : outstream -> StreamIO.outstream
    val setOutstream : outstream * StreamIO.outstream -> unit
    val getPosOut : outstream -> StreamIO.out_pos
    val setPosOut : outstream * StreamIO.out_pos -> unit
end;
