Function Connection.lastCommandId
This gets incremented every time a command is issued or results are purged,
so a ResultRange can tell whether it's been invalidated.
Prototype
ulong lastCommandId() pure nothrow @property const;
This gets incremented every time a command is issued or results are purged,
so a ResultRange can tell whether it's been invalidated.
ulong lastCommandId() pure nothrow @property const;