# Package org.eclipse.viatra.query.runtime.matchers.memories

- Class Summary
  Class | Description
  --- | ---
  DefaultMaskedTupleMemory<Timestamp extends java.lang.Comparable<Timestamp>> |
  IdentityMaskedTupleMemory<Timestamp extends java.lang.Comparable<Timestamp>> | Specialized for identity mask; tuples are stored as a simple set/multiset memory.
  MaskedTupleMemory<Timestamp extends java.lang.Comparable<Timestamp>> | Indexes a collection of tuples by their signature (i.e.
  NullaryMaskedTupleMemory<Timestamp extends java.lang.Comparable<Timestamp>> | Specialized for nullary mask; tuples are stored as a simple set/multiset memory.
  UnaryMaskedTupleMemory<Timestamp extends java.lang.Comparable<Timestamp>> | Specialized for unary mask; tuples are indexed by a single column as opposed to a projection (signature) tuple.