@Retention(value=RUNTIME) @Target(value={PARAMETER,METHOD,ANNOTATION_TYPE}) public @interface In
When a java object is passed to a native function as a pointer
(for example Pointer
, Struct
, ByteBuffer
),
then a temporary native memory block is allocated, the java data is copied to
the temporary memory and the address of the temporary memory is passed to the function.
After the function returns, the java data is automatically updated from the
contents of the native memory.
As this extra copying can be expensive, parameters can be annotated with @In
so the data is only copied from java IN
to native memory, but not copied
back OUT
from native memory to java memory.
Parameters with neither a @In
nor a @Out
annotation will copy both ways.
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