81 lines
4.8 KiB
Rexx
81 lines
4.8 KiB
Rexx
#!@OOREXX_SHEBANG_PROGRAM@
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/*----------------------------------------------------------------------------*/
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/* */
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/* Copyright (c) 2005-2021 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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/* Description: */
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/* usesingleton.rex demonstrates how to use the Singleton class */
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/******************************************************************************/
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do clz over .test, .testSingleton -- iterate over the two classes
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rounds=3
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say "creating" rounds "objects of type:" clz
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do i=1 to rounds
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say " round #" i":" clz~new -- create new instance
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end
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say
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end
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/* ========================================================================= */
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/** This Test class counts the number of instances that get created for it. */
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::class Test
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/* ------------- class method and class attribute definitions -------------- */
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::method init class -- class constructor
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expose counter
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counter=0 -- make sure attribute is initialized to 0
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::attribute counter get private class -- getter method that increases counter
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expose counter -- access attribute
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counter+=1 -- increase counter by 1
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return counter -- return new counter value
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/* ------------- instance method and instance attribute definitions -------- */
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::attribute nr get -- getter method
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::method init -- constructor that sets the value of attribute nr
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expose nr -- expose attribute
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nr=self~class~counter -- new instance: fetch new counter from class and save it
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::method makestring -- a string representation of the object
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expose nr -- expose attribute
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-- return a string representation
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return "a" self~class~id"[nr="nr",identityHash="self~identityHash"]"
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/* ========================================================================= */
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/** This class makes sure that only a single instance of it gets created by
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* using Singleton as its metaclass.
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*/
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::class TestSingleton subclass Test metaclass Singleton
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