Mercurial > hg > graal-compiler
diff 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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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/com.oracle.truffle.ruby.runtime/src/com/oracle/truffle/ruby/runtime/UndefinedPlaceholder.java Mon Jan 06 17:12:09 2014 +0000 @@ -0,0 +1,24 @@ +/* + * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved. This + * code is released under a tri EPL/GPL/LGPL license. You can use it, + * redistribute it and/or modify it under the terms of the: + * + * Eclipse Public License version 1.0 + * GNU General Public License version 2 + * GNU Lesser General Public License version 2.1 + */ +package com.oracle.truffle.ruby.runtime; + +/** + * The {@link UndefinedPlaceholder} is a value that represents an undefined value in Ruby. This is + * used to differentiate between nil and the true absence of a value, such as an argument that has + * not been passed. + */ +public final class UndefinedPlaceholder { + + public static final UndefinedPlaceholder INSTANCE = new UndefinedPlaceholder(); + + private UndefinedPlaceholder() { + } + +}