python
class StringVisualizer:
    def to_string (self, v):
        # FIXME: catch any exceptions accessing bogus memory
        data = v.element ("_M_dataplus")
        return str (data.element ("_M_p"))
class VectorVisualizer:
    def children (self, v):
        result = []
        impl = v.element ('_M_impl')
        start = impl.element ('_M_start')
        finish = impl.element ('_M_finish')
        current = start
        index = 0
        while not current.equals(finish):
            result.append((str(index), current.dereference()))
            current = current.increment(1)
            index = index + 1
        return result
end