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Here is a rough idea how it can work:
Comparator = Callable[[Any, Any], int]
@ccall
def qsort(arr: Sequence[Any],
num_elems: int,
elem_size: int,
comp: Comparator) -> None:
passThe types have to be adjusted. And we want to use it like:
def sort_f16_idx_val_ascending(iv_ptr: CPtr, num_elements: i32) -> None:
iv = ctypes.cast(iv_ptr, ctypes.POINTER(gd_lab_4_idx_val))
qsort(iv, num_elements, sizeof(gd_lab_4_idx_val), f16_idx_val_cmp_ascending)where the f16_idx_val_cmp_ascending function is the comparator. And we want this to call the qsort function in C.
I think we have most of these pieces in LPython/LFortran, we just need to write a test for this and ensure everything works and fix any bugs.
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