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Showing content from https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/foreign/GroupLayout.html below:

GroupLayout (Java SE 21 & JDK 21)

All Superinterfaces:

MemoryLayoutPREVIEW

All Known Subinterfaces:

StructLayoutPREVIEW, UnionLayoutPREVIEW

A compound layout that is an aggregation of multiple, heterogeneous

. There are two ways in which member layouts can be combined: if member layouts are laid out one after the other, the resulting group layout is a

; conversely, if all member layouts are laid out at the same starting offset, the resulting group layout is a

.

Implementation Requirements:

This class is immutable, thread-safe and value-based.

Sealed Class Hierarchy Graph:

Since:

19

• Nested Class Summary
• Method Summary

  Returns the member layouts of this group layout.

  Returns a memory layout with the same characteristics as this layout, but with the given alignment constraint (in bytes).

  Returns a memory layout with the same characteristics as this layout, but with the given name.

  Returns a memory layout with the same characteristics as this layout, but with no name.

  Methods declared in interface java.lang.foreign.MemoryLayout^PREVIEWbyteAlignment, byteOffset, byteOffsetHandle, byteSize, equals, hashCode, name, select, sliceHandle, toString, varHandle

• Method Details
  • memberLayouts

    Returns the member layouts of this group layout.

    API Note:

    the order in which member layouts are returned is the same order in which member layouts have been passed to one of the group layout factory methods (see MemoryLayout.structLayout(MemoryLayout...)^PREVIEW, MemoryLayout.unionLayout(MemoryLayout...)^PREVIEW).

    Returns:

    the member layouts of this group layout

  • withName

    Returns a memory layout with the same characteristics as this layout, but with the given name.

    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:

    • MemoryLayout.name()^PREVIEW

  • withoutName

    Returns a memory layout with the same characteristics as this layout, but with no name.

    Specified by:

    withoutName in interface MemoryLayoutPREVIEW

    Returns:

    a memory layout with the same characteristics as this layout, but with no name

    See Also:

    • MemoryLayout.name()^PREVIEW

  • withByteAlignment

    Returns a memory layout with the same characteristics as this layout, but with the given alignment constraint (in bytes).

    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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