Mercurial > hg > graal-compiler
comparison graal/com.oracle.truffle.ruby.runtime/src/com/oracle/truffle/ruby/runtime/UndefinedPlaceholder.java @ 13514:0fbee3eb71f0
Ruby: import project.
author | Chris Seaton <chris.seaton@oracle.com> |
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date | Mon, 06 Jan 2014 17:12:09 +0000 |
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13513:64a23ce736a0 | 13514:0fbee3eb71f0 |
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1 /* | |
2 * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved. This | |
3 * code is released under a tri EPL/GPL/LGPL license. You can use it, | |
4 * redistribute it and/or modify it under the terms of the: | |
5 * | |
6 * Eclipse Public License version 1.0 | |
7 * GNU General Public License version 2 | |
8 * GNU Lesser General Public License version 2.1 | |
9 */ | |
10 package com.oracle.truffle.ruby.runtime; | |
11 | |
12 /** | |
13 * The {@link UndefinedPlaceholder} is a value that represents an undefined value in Ruby. This is | |
14 * used to differentiate between nil and the true absence of a value, such as an argument that has | |
15 * not been passed. | |
16 */ | |
17 public final class UndefinedPlaceholder { | |
18 | |
19 public static final UndefinedPlaceholder INSTANCE = new UndefinedPlaceholder(); | |
20 | |
21 private UndefinedPlaceholder() { | |
22 } | |
23 | |
24 } |