81 lines
4.4 KiB
Rexx
Executable File
81 lines
4.4 KiB
Rexx
Executable File
#!@OOREXX_SHEBANG_PROGRAM@
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/*----------------------------------------------------------------------------*/
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/* */
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/* Copyright (c) 2005-2014 Rexx Language Association. All rights reserved. */
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/* */
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/* This program and the accompanying materials are made available under */
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/* the terms of the Common Public License v1.0 which accompanies this */
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/* distribution. A copy is also available at the following address: */
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/* https://www.oorexx.org/license.html */
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/* */
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/* Redistribution and use in source and binary forms, with or */
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/* without modification, are permitted provided that the following */
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/* conditions are met: */
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/* */
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/* Redistributions of source code must retain the above copyright */
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/* notice, this list of conditions and the following disclaimer. */
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/* Redistributions in binary form must reproduce the above copyright */
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/* notice, this list of conditions and the following disclaimer in */
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/* the documentation and/or other materials provided with the distribution. */
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/* */
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/* Neither the name of Rexx Language Association nor the names */
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/* of its contributors may be used to endorse or promote products */
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/* derived from this software without specific prior written permission. */
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/* */
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/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS */
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/* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT */
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/* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS */
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/* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT */
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/* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, */
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/* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED */
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/* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, */
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/* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY */
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/* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING */
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/* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS */
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/* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
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/* */
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/*----------------------------------------------------------------------------*/
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/******************************************************************************/
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/* constrained.rex Open Object Rexx Samples */
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/* */
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/* -------------------------------------------------------------------------- */
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/* */
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/* Description: */
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/* Demonstrate now to use the isA method to check for particular types */
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/* of objects. */
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/******************************************************************************/
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call dinnerTime .pizza~new
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call dinnerTime .spinach~new
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call dinnerTime "mud"
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-- a mixin class that defines the interface for being "food", and
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-- thus expected to implement an "eat" method
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::class food mixinclass object
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::method eat abstract
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::class pizza subclass food
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::method eat
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Say "mmmmmmmm, pizza".
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-- mixin classes can also be used for multiple inheritance
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::class spinach inherit food
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::method eat
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Say "I'm strong to the finish, 'cause I eats me spinach!".
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-- "eat" a food item. The argument item must be an instance of the Food
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-- class.
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::routine dinnerTime
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use arg dish
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-- ooRexx arguments are typeless, so tests for constrained
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-- types must be peformed at run time. The isA method will
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-- check if an object is of the required type
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if \dish~isA(.food) then do
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say "I can't eat" dish". It's not a food!"
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return
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end
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else dish~eat
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