pub unsafe extern "C" fn rocksdb_approximate_memory_usage_get_mem_table_readers_total(
memory_usage: *mut rocksdb_memory_usage_t,
) -> u64
pub unsafe extern "C" fn rocksdb_approximate_memory_usage_get_mem_table_readers_total(
memory_usage: *mut rocksdb_memory_usage_t,
) -> u64