Brett Calcott, 20.08.2012 08:23:

I'm not sure if this is a bug in 0.17 beta or not. But something is not working.

Default-constructed attributes in an extension definition appear to work (though I can't see where they are documented on the site…)

So this works:

----test.h -------- #include <vector>

struct Attributes { std::vector<int> v; };

-----test.pyx------ from libcpp.vector cimport vector

cdef extern from "test.h": cdef cppclass Attributes: vector[int] v

cdef class Test: cdef Attributes a def __cinit__(self, list x): self.a.v = x

However, if I try to put the templated attribute in directly:

----test2.pyx------ from libcpp.vector cimport vector

cdef class Test: cdef vector[int] v def __cinit__(self, list x): self.v = x

cython compiles it fine, but I get an error in the cpp compilation: test2.cpp:722:23: error: expected a type new((void*)&(p->v)) std::vector();

So it looks like it's doing the funky in place construction, but not getting the template parameters in there…

Should this work?

Yes, although (IIRC) not in beta 2. There was a recent fix for this, but it broke other stuff. I'm waiting for a fix for those before I release yet another beta (which will then hopefully be a release candidate). In any case, thanks for the report! Stefan