devices.sa
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-------------------------> GNU Sather - sourcefile <-------------------------
-- Copyright (C) 2000 by K Hopper, University of Waikato, New Zealand --
-- 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> <--------------
abstract class $OUT_DEVICE
abstract class $OUT_DEVICE is
-- This class models the device which is available to export data of
-- some kind from the program.
-- Version 1.2 Nov 98. Copyright K Hopper, U of Waikato
-- Development History
-- -------------------
-- Date Who By Detail
-- ---- ------ ------
-- 8 Apr 96 kh Original
-- 12 Aug 97 kh Introduced selection operations
-- 19 Nov 98 kh Revised for properties only.
output_possible : BOOL ;
-- This returns trus if and only if the device is in a state where data
-- can be exported from the program (eg the standard output channel).
end ; --$OUT_DEVICE
abstract class $IN_DEVICE
abstract class $IN_DEVICE is
-- This abstraction models the input analogue of the output device.
-- Version 1.2 Nov 98. Copyright K Hopper, U of Waikato
-- Development History
-- -------------------
-- Date Who By Detail
-- ---- ------ ------
-- 8 Apr 96 kh Original
-- 12 Aug 97 kh Introduced selection operations
-- 19 Nov 98 kh Revised for properties only.
input_possible : BOOL ;
-- This returns trus if and only if the device is in a state where data
-- can be imported into the program (eg the standard input channel).
end ; -- $IN_DEVICE
abstract class $INOUT_DEVICE < $IN_DEVICE, $OUT_DEVICE
abstract class $INOUT_DEVICE < $IN_DEVICE, $OUT_DEVICE is
-- This class models the generic input/output device which may be,
-- for example, a network device or any other bi-directional hardware I/O
-- device.
-- Version 1.0 Nov 87. Copyright K Hopper, U of Waikato
-- Development History
-- -------------------
-- Date Who By Detail
-- ---- ------ ------
-- 19 Nov 98 kh Original
end ; --$INOUT_DEVICE