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Pointer and Reference
squid233 edited this page Feb 1, 2024
·
5 revisions
The pointer type of method parameters are all converted to MemorySegment
.
No-const
pointer types can be assigned from native functions. We overload it to array type.
// C: void load(int* result)
void load(MemorySegment result);
void load(SegmentAllocator allocator, int[] result) {
MemorySegment seg = allocator.allocate(JAVA_INT);
load(seg);
result[0] = seg.get(JAVA_INT, 0);
}
This also applied to array in C.
// C: void get(int* results);
void get(MemorySegment results);
void get(SegmentAllocator allocator, int[] results) {
// we use external libraries
MemorySegment seg = Marshal.marshal(allocator, result);
get(results);
Unmarshal.copy(seg, results);
}
For const
array type, simply allocate an array.
// C: void set(int* const values);
void set(MemorySegment values);
void set(SegmentAllocator allocator, int[] values) {
set(allocator.allocateArray(JAVA_INT, values));
}
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