boost python exports

2 Mar 2022

      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_
...
("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

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
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
-- David

David Waterman

David Waterman

David Waterman

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