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import virtual_poly
d = virtual_poly.NDouble(3.5)
i = virtual_poly.NInt(2)
#
# the copy methods return the right polymorphic types
#
dc = d.copy()
ic = i.copy()
if d.get() != dc.get():
raise RuntimeError
if i.get() != ic.get():
raise RuntimeError
virtual_poly.incr(ic)
if (i.get() + 1) != ic.get():
raise RuntimeError
dr = d.ref_this()
if d.get() != dr.get():
raise RuntimeError
#
# 'narrowing' also works
#
ddc = virtual_poly.NDouble.narrow(d.nnumber())
if d.get() != ddc.get():
raise RuntimeError
dic = virtual_poly.NInt.narrow(i.nnumber())
if i.get() != dic.get():
raise RuntimeError
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