Here is part of original testcase:
from cython.operator cimport dereference as d
from cython.operator cimport preincrement as incr
from libcpp.vector cimport vector
def reverse_iteration_test(L):
v = new vector[int]()
for a in L:
v.push_back(a)
it = v.rbegin()
while it != v.rend():
a = d(it)
incr(it)
print(a)
It doesn't work with local type inference enabled since `a` in
for-loop is infered as pyobject and in while loop it's inferred as
reverse_iterator.
Then I tried to comment out for loop and compile it with
upstream/master, same error here:
note: cpp_stl_vector.pyx:8:6: inferred 'v' to be of type 'vector[int] *'
note: cpp_stl_vector.pyx:11:7: inferred 'it' to be of type 'reverse_iterator'
note: cpp_stl_vector.pyx:13:10: inferred 'a' to be of type 'reverse_iterator'
Error compiling Cython file:
------------------------------------------------------------
...
v = new vector[int]()
#for a in L:
# v.push_back(a)
it = v.rbegin()
while it != v.rend():
a = d(it)
^
------------------------------------------------------------
cpp_stl_vector.pyx:13:13: Cannot assign type 'int &' to 'reverse_iterator'
Error compiling Cython file:
------------------------------------------------------------
...
# v.push_back(a)
it = v.rbegin()
while it != v.rend():
a = d(it)
incr(it)
print(a)
^
------------------------------------------------------------
cpp_stl_vector.pyx:15:15: Cannot convert 'reverse_iterator' to Python object
I think it's not correct to infer `a` as reverse_iterator because it's
not an iterator it's vector's item.
--
vitja.
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