Hi folks,
I'm trying to create a boost python class that works with either vec3 or mat3 arrays (and I only need those two types). I made a templated class and then exported it twice with different names, for the vec3 and mat3 versions. For example, for mat3:
class_<ReconstituteDerivatives< mat3<double> > >("ReconstituteDerivativesMat3", no_init)
.def("get_data", &ReconstituteDerivatives< mat3<double> >::get_data)
.def("get_indices", &ReconstituteDerivatives< std::size_t >::get_indices);
I can create one of these objects from Python
>>> foo
<dials_refinement_helpers_ext.ReconstituteDerivativesMat3 object at 0x7f3ffa421ac0>
but the accessors are not exported properly:
>>> foo.get_data()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: No to_python (by-value) converter found for C++ type: scitbx::af::shared<scitbx::mat3<double> >
I expected a scitbx_array_family_flex_ext.mat3_double here
>>> foo.get_indices()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
Boost.Python.ArgumentError: Python argument types in
ReconstituteDerivativesMat3.get_indices(ReconstituteDerivativesMat3)
did not match C++ signature:
get_indices(dials::refinement::ReconstituteDerivatives<unsigned long> {lvalue})
and I expected a scitbx_array_family_flex_ext.size_t here.
Is it likely there is something simple I am missing, like a #include? I do include flex_wrapper.h. Or perhaps I am just doing something wrong with templated classes and boost python. Looking at other code isn't helping to reveal the mysteries to me yet.
Cheers