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# mode: run
# tag: assign, exttype
cdef struct X:
int ix
X* x
cdef class A:
cdef int i
cdef list l
cdef object o
cdef X x
def assign_A(self):
"""
>>> A().assign_A()
(2, [1, 2, 3])
"""
a = A()
a.i = 1
a.l = [1, 2, 3]
a.o = a.l
a.o = a.o
a.l = a.o
a.i = a.l[1]
return a.i, a.l
def assign_A_struct(self):
"""
>>> A().assign_A_struct()
(5, 2, 2, 5)
"""
cdef X x
a = A()
a.x.ix = 2
a.x.x = &x
x.ix = 5
x.x = &a.x
assert a.x.x.x is &a.x
a.x.x.x.x.x.x.x = a.x.x.x.x
assert x.x is &x
assert x.x.x is &x
assert a.x.x is &x
a.x.x.x.x.x.x.x, a.x.x.x = a.x.x.x.x, &a.x # replay+undo :)
assert x.x is &a.x
assert x.x.x is &x
return x.ix, x.x.ix, a.x.ix, a.x.x.ix
cdef class B(A):
cdef int ib
cdef object ob
cdef A a
def assign_B(self):
"""
>>> B().assign_B()
(1, 2, 5, 9, 2)
"""
b = B()
b.i = 1
b.ib = 2
b.l = [b.i, b.ib]
b.o = b.l
b.ob = b.o
assert b.ob == b.l
b.o = b.ob = b.l
b.a = A() # only one reference!
b.a.o = 5
b.a.i = 5
b.a, b.a.i = A(), b.a.i # overwrite b.a but keep b.a.i
assert b.a.i == 5
assert b.a.o is None
b.a.o = 9
b.a, b.a.i, b.a.o = A(), b.a.i, b.a.o
return b.i, b.ib, b.a.i, b.a.o, b.o[1]
def cross_assign_Ba(self):
"""
>>> B().cross_assign_Ba()
2
"""
b = B()
b.a = A()
b.a.i = 1
b.a.o = A() # only one reference!
(<A>b.a.o).i = 2
b.a = b.a.o
return b.a.i
def cascaded_assign_B(self):
"""
>>> B().cascaded_assign_B()
(2, 2)
"""
cdef B b = B()
b.ib = 1
b.a = A()
b.a.o = B() # only one reference!
(<B>b.a.o).ib = 2
b = b.ob = b.a.o
return b.ib, (<B>b.ob).ib
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