[Cython] 'local variable referenced before assignment' warnings

Robert Bradshaw robertwb at math.washington.edu
Thu Sep 22 01:36:20 CEST 2011

On Wed, Sep 21, 2011 at 1:20 AM,  <robert.rex at exasol.com> wrote:
> Hi Robert,
> Robert Bradshaw wrote:
>> The warning seem correct to me, or is foo actually modifying the
>> values of cya and cyb? (I suppose this could be possible by taking the
>> address of the "passed by reference" arguments, but would seem like a
>> *very* poor API design.)
> thanks for your fast answer! What made me came up with this issue is
> that GCC/C++ will not complain in similar situations in C++ code (and
> assumes foo() to initialize/change the value of cya/cyb). Thus, there
> is an (arguable) difference in C++ compiler/Cython warnings.

Yes, in C++ the called function can modify values passed by reference,
so we need to add this exception to Cython.

- Robert

More information about the cython-devel mailing list