index2<I1 extends SdbIndexKey, I2 extends SdbIndexKey> method
Index reference on 2 fields
Implementation
SdbIndex2Ref<K, V, I1, I2> index2<
I1 extends SdbIndexKey,
I2 extends SdbIndexKey
>(String name) => SdbIndex2RefImpl<K, V, I1, I2>(impl, name);