stream.sa
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-------------------------> GNU Sather - sourcefile <-------------------------
-- Copyright (C) 1995 by International Computer Science Institute --
-- This file is part of the GNU Sather library. It is free software; you may --
-- redistribute and/or modify it under the terms of the GNU Library General --
-- Public License (LGPL) as published by the Free Software Foundation; --
-- either version 2 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 Doc/LGPL for more details. --
-- The license text is also available from: Free Software Foundation, Inc., --
-- 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA --
--------------> Please email comments to <bug-sather@gnu.org> <--------------
-- Author: Benedict A. Gomes <gomes@samosa.ICSI.Berkeley.EDU>
abstract class $OSTREAM
abstract class $OSTREAM is
-- A general output stream. A first stab at streams. This
-- abstraction is already useful for routines that might use a file
-- or a string ( a common choice is whether a routine will write to
-- stdout or to a string which may then be printed to a file).
--
-- Usage:
-- write_to_stream(o: $OUTSTREAM) is
-- o + "this is a test";
-- end;
-- Which can be invoked using:
-- write_to_stream(FILE::stdout);
-- or
-- s: STR_STREAM := #;
-- write_to_stream(s);
-- write_to_stream(s);
-- s.str then would have two copies of "this is a test" in it.
plus(s: $STR);
-- Append the string "s" to the stream
plus(s: $STR): SAME;
-- Append the string "s" to the stream and return self
end; -- class $OUTSTREAM