def check_range(self, j):
"""Check that j is a valid index into self."""
if isinstance(j, int):
if j < 0 or j >= self.size:
raise QiskitIndexError("register index out of range")
elif isinstance(j, slice):
if j.start < 0 or j.stop >= self.size or (j.step is not None and
j.step <= 0):
raise QiskitIndexError("register index slice out of range")
def check_range(self, j):
"""Check that j is a valid index into self."""
if j < 0 or j >= self.size:
raise QiskitIndexError("register index out of range")