How do you test code that uses struct layouts and VarHandle?

To test code that uses struct layouts and VarHandle in Java, you can create a simple application that demonstrates how to define a struct-like layout using `MemoryLayout` and access its fields using `VarHandle`. Below is an example showcasing these concepts.


    import java.lang.invoke.MethodHandles;
    import java.lang.invoke.VarHandle;
    import java.lang.foreign.MemoryLayout;
    import java.lang.foreign.MemorySegment;

    public class StructTest {
        static final MemoryLayout STRUCT_LAYOUT = MemoryLayout.structLayout(
            MemoryLayout.ofValuePadding(MemoryLayout.ofValueBits(32, java.nio.ByteOrder.BIG_ENDIAN)),
            MemoryLayout.ofValueBits(64, java.nio.ByteOrder.BIG_ENDIAN)
        );

        static final VarHandle INT_FIELD = MethodHandles.lookup().findVarHandle(StructTest.class, "intField", int.class);
        static final VarHandle LONG_FIELD = MethodHandles.lookup().findVarHandle(StructTest.class, "longField", long.class);

        private int intField;
        private long longField;

        public static void main(String[] args) {
            StructTest struct = new StructTest();
            struct.setIntField(42);
            struct.setLongField(10000000000L);

            System.out.println("Int Field: " + struct.getIntField());
            System.out.println("Long Field: " + struct.getLongField());
        }

        public void setIntField(int value) { INT_FIELD.set(this, value); }
        public int getIntField() { return (int) INT_FIELD.get(this); }
        public void setLongField(long value) { LONG_FIELD.set(this, value); }
        public long getLongField() { return (long) LONG_FIELD.get(this); }
    }

How do you test code that uses struct layouts and VarHandle?

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How do you test code that uses struct layouts and VarHandle?

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