Interface GroupLayout
- All Superinterfaces:
MemoryLayout
- All Known Subinterfaces:
StructLayout
,UnionLayout
A compound layout that is an aggregation of multiple, heterogeneous
member layouts. 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
struct layout; conversely, if all member layouts are laid
out at the same starting offset, the resulting group layout is a
union layout.
- Implementation Requirements:
- This class is immutable, thread-safe and value-based.
- Since:
- 22
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Nested Class Summary
Nested classes/interfaces declared in interface java.lang.foreign.MemoryLayout
MemoryLayout.PathElement
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Method Summary
Modifier and TypeMethodDescriptionReturns the member layouts of this group layout.withByteAlignment
(long byteAlignment) 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
arrayElementVarHandle, byteAlignment, byteOffset, byteOffsetHandle, byteSize, equals, hashCode, name, scale, scaleHandle, select, sliceHandle, toString, varHandle
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Method Details
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memberLayouts
List<MemoryLayout> 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...)
andMemoryLayout.unionLayout(MemoryLayout...)
). - Returns:
- the member layouts of this group layout
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withName
Returns a memory layout with the same characteristics as this layout, but with the given name.- Specified by:
withName
in interfaceMemoryLayout
- Parameters:
name
- the layout name- Returns:
- a memory layout with the same characteristics as this layout, but with the given name
- See Also:
-
withoutName
GroupLayout withoutName()Returns a memory layout with the same characteristics as this layout, but with no name.- Specified by:
withoutName
in interfaceMemoryLayout
- Returns:
- a memory layout with the same characteristics as this layout, but with no name
- See Also:
-
withByteAlignment
Returns a memory layout with the same characteristics as this layout, but with the given alignment constraint (in bytes).- Specified by:
withByteAlignment
in interfaceMemoryLayout
- 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
- ifbyteAlignment
is not a power of twoIllegalArgumentException
- ifbyteAlignment
is less thanM
, whereM
is the maximum alignment constraint in any of the member layouts associated with this group layout
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