1 /*
 2  * Copyright (c) 2019, 2023, Oracle and/or its affiliates. All rights reserved.
 3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 4  *
 5  * This code is free software; you can redistribute it and/or modify it
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 7  * published by the Free Software Foundation.  Oracle designates this
 8  * particular file as subject to the "Classpath" exception as provided
 9  * by Oracle in the LICENSE file that accompanied this code.
10  *
11  * This code is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  * version 2 for more details (a copy is included in the LICENSE file that
15  * accompanied this code).
16  *
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19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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24  */
25 
26 package java.lang.foreign;
27 
28 import jdk.internal.foreign.layout.UnionLayoutImpl;
29 import jdk.internal.javac.PreviewFeature;
30 
31 /**
32  * A group layout whose member layouts are laid out at the same starting offset.
33  *
34  * @implSpec
35  * Implementing classes are immutable, thread-safe and <a href="{@docRoot}/java.base/java/lang/doc-files/ValueBased.html">value-based</a>.
36  *
37  * @since 20
38  */
39 @PreviewFeature(feature=PreviewFeature.Feature.FOREIGN)
40 public sealed interface UnionLayout extends GroupLayout permits UnionLayoutImpl {
41 
42     /**
43      * {@inheritDoc}
44      */
45     @Override
46     UnionLayout withName(String name);
47 
48     /**
49      * {@inheritDoc}
50      */
51     @Override
52     UnionLayout withoutName();
53 
54     /**
55      * {@inheritDoc}
56      * @throws IllegalArgumentException {@inheritDoc}
57      */
58     @Override
59     UnionLayout withByteAlignment(long byteAlignment);
60 }