Function leveldb_sys::leveldb_approximate_sizes

pub unsafe extern "C" fn leveldb_approximate_sizes(
    db: *mut leveldb_t, 
    num_ranges: c_int, 
    range_start_key: *const *const c_char, 
    range_start_key_len: *const size_t, 
    range_limit_key: *const *const c_char, 
    range_limit_key_len: *const size_t, 
    sizes: *mut u64
)