cython

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# mode: run
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# tag: cpdef
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# This also makes a nice benchmark for the cpdef method call dispatching code.
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cdef class Ext:
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    """
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    >>> x = Ext()
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    >>> x.rec(10)
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    0
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    """
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    cpdef rec(self, int i):
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        return 0 if i < 0 else self.rec(i-1)
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class Py(Ext):
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    """
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    >>> p = Py()
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    >>> p.rec(10)
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    0
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    """
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    pass
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class Slots(Ext):
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    """
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    >>> s = Slots()
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    >>> s.rec(10)
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    0
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    """
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    __slots__ = ()
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class PyOverride(Ext):
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    """
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    >>> p = PyOverride()
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    >>> p.rec(10)
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    10
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    5
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    >>> p.rec(12)
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    12
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    11
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    10
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    5
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    """
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    def rec(self, i):
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        print(i)
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        return Ext.rec(self, i) if i > 10 else 5
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class SlotsOverride(Ext):
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    """
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    >>> s = SlotsOverride()
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    >>> s.rec(10)
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    10
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    6
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    >>> s.rec(12)
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    12
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    11
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    10
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    6
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    """
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    __slots__ = ()
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    def rec(self, i):
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        print(i)
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        return Ext.rec(self, i) if i > 10 else 6
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