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/OpenJDK 21

Interface StructLayout

All Superinterfaces:
GroupLayoutPREVIEW, MemoryLayoutPREVIEW
public sealed interface StructLayout extends GroupLayoutPREVIEW
StructLayout is a preview API of the Java platform.
Programs can only use StructLayout when preview features are enabled.
Preview features may be removed in a future release, or upgraded to permanent features of the Java platform.
A group layout whose member layouts are laid out one after the other.
Implementation Requirements:
Implementing classes are immutable, thread-safe and value-based.
Since:
20

Nested Class Summary

Nested classes/interfaces declared in interface java.lang.foreign.MemoryLayoutPREVIEW

MemoryLayout.PathElementPREVIEW

Method Summary

Modifier and Type Method Description
StructLayoutPREVIEW withByteAlignment(long byteAlignment)
Returns a memory layout with the same characteristics as this layout, but with the given alignment constraint (in bytes).
StructLayoutPREVIEW withName(String name)
Returns a memory layout with the same characteristics as this layout, but with the given name.
StructLayoutPREVIEW withoutName()
Returns a memory layout with the same characteristics as this layout, but with no name.

Methods declared in interface java.lang.foreign.GroupLayoutPREVIEW

memberLayouts

Method Details

withName

StructLayoutPREVIEW withName(String name)
Returns a memory layout with the same characteristics as this layout, but with the given name.
Specified by:
withName in interface GroupLayoutPREVIEW
Specified by:
withName in interface MemoryLayoutPREVIEW
Parameters:
name - the layout name.
Returns:
a memory layout with the same characteristics as this layout, but with the given name
See Also:

withoutName

StructLayoutPREVIEW withoutName()
Returns a memory layout with the same characteristics as this layout, but with no name.
Specified by:
withoutName in interface GroupLayoutPREVIEW
Specified by:
withoutName in interface MemoryLayoutPREVIEW
Returns:
a memory layout with the same characteristics as this layout, but with no name
See Also:

withByteAlignment

StructLayoutPREVIEW withByteAlignment(long byteAlignment)
Returns a memory layout with the same characteristics as this layout, but with the given alignment constraint (in bytes).
Specified by:
withByteAlignment in interface GroupLayoutPREVIEW
Specified by:
withByteAlignment in interface MemoryLayoutPREVIEW
Parameters:
byteAlignment - the layout alignment constraint, expressed in bytes.
Returns:
a memory layout with the same characteristics as this layout, but with the given alignment constraint (in bytes)
Throws:
IllegalArgumentException - if byteAlignment is not a power of two.
IllegalArgumentException - if byteAlignment is less than M, where M is the maximum alignment constraint in any of the member layouts associated with this group layout.

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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
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https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/foreign/StructLayout.html