A mutable table that maps a pair of keys (row key, column key) to a value.
the type of row keys
the type of column keys
the type of values
Removes all mappings from the table.
Associates the specified value with the specified keys.
Adds all mappings from the specified table to this table.
Removes the mapping, if any, associated with the given keys.
Removes all mappings that have the given column key.
Removes all mappings that have the given row key.