Function librocksdbsys::crocksdb_approximate_sizes

pub unsafe extern "C" fn crocksdb_approximate_sizes(
    db: *mut DBInstance, 
    num_ranges: c_int, 
    range_start_key: *const *const u8, 
    range_start_key_len: *const size_t, 
    range_limit_key: *const *const u8, 
    range_limit_key_len: *const size_t, 
    sizes: *mut uint64_t
)