Thank you for your quick reply, you are right, I ought to have read it. Sorry for bothering.
Kornel On Sun, Dec 19, 2010 at 10:40 AM, Robert Bradshaw < rober...@math.washington.edu> wrote: > On Sun, Dec 19, 2010 at 1:31 AM, Kornél JAHN <corn...@gmail.com> wrote: > > Hello, > > I have been experiencing strange behavior regarding overloaded operators > for > > cdef classes, using Cython 0.14. I think it can be regarded as a bug. See > > the example code below: > > # File: opoverload.pyx > > class Test1: > > def __rmul__(self, other): > > print "Calling Test1.__rmul__() with", type(self), type(other) > > def __mul__(self, other): > > print "Calling Test1.__mul__() with", type(self), type(other) > > cdef class Test2: > > def __rmul__(self, other): > > print "Calling Test2.__rmul__() with", type(self), type(other) > > def __mul__(self, other): > > print "Calling Test2.__mul__() with", type(self), type(other) > > Python console: > >>>> from opoverload import * > >>>> Test1() * 2.0 > > Calling Test1.__mul__() with <type 'instance'> <type 'float'> > >>>> 2.0 * Test1() > > Calling Test1.__rmul__() with <type 'instance'> <type 'float'> > >>>> Test2() * 2.0 > > Calling Test2.__mul__() with <type 'opoverload.Test2'> <type 'float'> > >>>> 2.0 * Test2() > > Calling Test2.__mul__() with <type 'float'> <type 'opoverload.Test2'> > > Test2.__rmul__() should be called and type(self) should not become float! > > Have you read http://docs.cython.org/src/userguide/special_methods.html ? > > > Can you please suggest a temporary workaround? > > Manually check the types in your arithmetic functions. (Yes, I know > that's not as nice as it could be, it's just a reflection of the > underlying C API that we haven't glossed over.) > > - Robert > _______________________________________________ > Cython-dev mailing list > Cython-dev@codespeak.net > http://codespeak.net/mailman/listinfo/cython-dev > -- Kornél JAHN engineering physicist, PhD student Budapest University of Technology and Economics, Hungary
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