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# mode: run
# tag: exttype, tpnew
from __future__ import print_function
from cpython.object cimport PyTypeObject
cdef gobble(a, b):
print(a, b)
def tp_new_ptr(exttype):
assert isinstance(exttype, type)
tp = <PyTypeObject*> exttype
return <unsigned long long><void*>tp.tp_new
cdef class Empty:
"""
>>> n = Empty()
>>> isinstance(n, Empty)
True
>>> tp_new_ptr(Empty) != 0
True
"""
cdef class EmptySubclass(Empty):
"""
>>> n = EmptySubclass()
>>> isinstance(n, EmptySubclass)
True
>>> tp_new_ptr(EmptySubclass) != 0
True
>>> tp_new_ptr(EmptySubclass) == tp_new_ptr(Empty)
True
"""
cdef class CInit:
"""
>>> c = CInit()
>>> isinstance(c, CInit)
True
"""
def __cinit__(self):
assert self is not None
cdef class Spam:
"""
>>> s = Spam(12)
>>> s.eat()
12 42
"""
cdef eggs
cdef int ham
def __cinit__(self, eggs):
self.eggs = eggs
self.ham = 42
def __dealloc__(self):
self.ham = 0
def eat(self):
gobble(self.eggs, self.ham)
def f(Spam spam):
"""
>>> s = Spam(12)
>>> f(s) # doctest: +ELLIPSIS
Traceback (most recent call last):
AttributeError: '...Spam' object has no attribute 'foo'
>>> s.eat()
12 42
>>> class Spam2(Spam):
... foo = 1
>>> s = Spam2(12)
>>> s.eat()
12 42
>>> f(s)
>>> s.eat()
12 42
"""
x = spam.eggs
y = spam.ham
z = spam.foo
spam.eggs = x
spam.ham = y
spam.foo = z
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