Function croaring_sys::roaring_bitmap_rank_many

pub unsafe extern "C" fn roaring_bitmap_rank_many(
    r: *const roaring_bitmap_t,
    begin: *const u32,
    end: *const u32,
    ans: *mut u64,
)

roaring_bitmap_rank_many is an Bulk version of roaring_bitmap_rank it puts rank value of each element in [begin .. end) to ans[]

the values in [begin .. end) must be sorted in Ascending order; Caller is responsible to ensure that there is enough memory allocated, e.g.

ans = malloc((end-begin) * sizeof(uint64_t));