/interpreter/tags/at2dist170907/src/edu/vub/at/objects/ATNil.java
Java | 47 lines | 6 code | 4 blank | 37 comment | 0 complexity | 7de3da92a3f6a4ef56bf906865d17296 MD5 | raw file
1/** 2 * AmbientTalk/2 Project 3 * ATNil.java created on 26-jul-2006 at 12:05:01 4 * (c) Programming Technology Lab, 2006 - 2007 5 * Authors: Tom Van Cutsem & Stijn Mostinckx 6 * 7 * Permission is hereby granted, free of charge, to any person 8 * obtaining a copy of this software and associated documentation 9 * files (the "Software"), to deal in the Software without 10 * restriction, including without limitation the rights to use, 11 * copy, modify, merge, publish, distribute, sublicense, and/or 12 * sell copies of the Software, and to permit persons to whom the 13 * Software is furnished to do so, subject to the following 14 * conditions: 15 * 16 * The above copyright notice and this permission notice shall be 17 * included in all copies or substantial portions of the Software. 18 * 19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 20 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES 21 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 22 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 23 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 24 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 25 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 26 * OTHER DEALINGS IN THE SOFTWARE. 27 */ 28package edu.vub.at.objects; 29 30import edu.vub.at.exceptions.InterpreterException; 31import edu.vub.at.objects.grammar.ATExpression; 32 33/** 34 * the native object representing 'nil' implements this interface. 35 * The type ATNil is a subtype of ATObject. 36 * 37 * @author tvcutsem 38 */ 39public interface ATNil extends ATObject, ATExpression { 40 41 /** 42 * The <tt>!=</tt> operator which returns <tt>false</tt> only if 43 * the passed parameter equals <tt>nil</tt>. 44 */ 45 public ATBoolean base__opnot__opeql_(ATObject other) throws InterpreterException; 46 47}