[cctbxbb] boost python exports

[David Waterman]

Oops, I see the problem there too ;-)

So, sorry for the noise, I got my toy example working now
-- David


On Wed, 2 Mar 2022 at 16:43, David Waterman <dgwaterman at gmail.com> wrote:

> Ah yes, I have to remember to actually import flex in python for the
> get_data() accessor to work.
>
> foo.get_indices() is a different issue. I should be able to copy-and-paste
> whatever I need from somewhere else a scitbx::af::shared< std::size_t > is
> returned.
>
> Cheers
> -- David
>
>
> On Wed, 2 Mar 2022 at 14:27, David Waterman <dgwaterman at gmail.com> wrote:
>
>> 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
>> -- David
>>
>
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