Fix Trac #10933 incomplete type in "contains"

[ax3l]

https://svn.boost.org/trac/boost/ticket/10933

Hi,

I am compiling Boost.Python with nvcc/6.5, gcc/4.6.2, python/2.7.8 and cmake/3.0.1 right now.

As a side note, I modified the standard FindPythonLibs.cmake a bit to match the cuda_add_library calls.

During compile, I get the error

boost/python/object_core.hpp(499): error: function "boost::python::api::object_operators<U>::attr(const char *) const" returns incomplete type "boost::python::api::const_object_attribute"

from include/boost/python/object_core.hpp

template <typename U>
template <class T>
object api::object_operators<U>::contains(T const& key) const
{
    return this->attr("__contains__")(object(key));
}

Replacing the return statement with

    return (*this)[object(key)];

seems to compile and my modules work, but I am not sure if the functionality is still ok since I have no idea what this function actually does (nor how to test/trigger it).

It would be great if we can fix that compile error and someone could give me a review.

[stefanseefeld]

Is this still an issue for current versions of nvcc ?

[ax3l]

Can't reproduce it with 8.0.44 from a quick test.