Function librocksdb_sys::crocksdb_approximate_memtable_stats_cf

pub unsafe extern "C" fn crocksdb_approximate_memtable_stats_cf(
    db: *const DBInstance, 
    cf: *const DBCFHandle, 
    range_start_key: *const u8, 
    range_start_key_len: size_t, 
    range_limit_key: *const u8, 
    range_limit_key_len: size_t, 
    count: *mut u64, 
    size: *mut u64
)