Function roaring64_bitmap_from_range 

pub unsafe extern "C" fn roaring64_bitmap_from_range(
    min: u64,
    max: u64,
    step: u64,
) -> *mut roaring64_bitmap_t

Create a new bitmap containing all the values in [min, max) that are at a distance k*step from min. The returned pointer may be NULL in case of errors.