DatabaseSnapshotReader

Do not declare new conformances to DatabaseSnapshotReader. Only the built-in conforming types are valid.

The protocol comes with the same features and guarantees as DatabaseReader. On top of them, a DatabaseSnapshotReader always sees the same state of the database.

Reading from the Database

• func reentrantRead<T>((Database) throws -> T) throws -> T

  Executes database operations, and returns their result after they have finished executing.