> On Tue, Oct 2, 2012 at 12:38 AM, peter aberline
> <peter.a...@gmail.com <javascript:>> wrote:
> > Hi all,

> > I'm new to Cython, it looks to be an incredible technology -
> congratulations
> > to all the devs.

> > Please excuse my basic question. I'm trying to pass a reference to a
> > std::vector to a function and I'm getting a cpp compilaton error. Here's
> a
> > minimum example of what I'm doing:

> > test.py:

> > import sys

> > def vectortest(a, idx):
> >     print ('a[idx] is: ' + str(a[idx]))
> >     a[idx] += 1
> >     print ('a[idx] is: ' + str(a[idx]))
> >     return a

> > def run():
> >     lst = range(1, 5)
> >     lstNew = vectortest(lst, 1)

> >     print ('lstNew[1] is :' + str(lstNew[1]))

> > test.pxd
> > import cython
> > from libcpp.vector cimport vector

> > import sys

> > if sys.version_info < (3,):
> >     range = xrange

> > cpdef vector[int] vectortest(vector[int] a, int idx)  # <-- This works
> fine
> > ('a' is pass by value?)

> > #cpdef vector[int] vectortest(vector[int]& a, int idx) #<-- This
> generates
> > an 'uninitialised reference' cpp compilation error ('a' is pass by
> > reference?')

> > @cython.locals(lst = vector[int])
> > cpdef run()

> > Compilation error:

> > $/test.cpp: In function ‘PyObject* __pyx_pw_4perf_1vectortest(PyObject*,
> > PyObject*, PyObject*)’:
> > $/test.cpp:640:21: error: ‘__pyx_v_a’ declared as reference but not
> > initialized

> > Can anyone suggest what I'm going wrong?

> Looks like this was a bug introduced In 0.17.1 and already fixed in
> master.

> - Robert