c++2py with -p (property method) does not wrap return types

[HugoStrand]

Dear Olivier,

I am trying to finish the h5 serialization of the cthyb solver and I think I am hitting a bug in c++2py. When wrapping a class using the -p flag c++2py does not automatically wrap the return types of the methods.

Here is a minimal example:

struct return_struct_t {
  int foo = -1;
};
class class_with_method : return_struct_t{
public:
  class_with_method(int number) {
    foo = number;
  }
  return_struct_t get_data() { return *this; }
};

when wrapping this with c++2py wrap_return.hpp -p --only="class_with_method" one gets

Welcome to C++2py
Parsing the C++ file (may take a few seconds) ...
... done. 

Analysing dependencies
Wrapping classes:
    class_with_method
Generating wrap_return_desc.py
   Class class_with_method : transforming to property : 
        get_data 

i.e. the return_struct_t is not wrapped and this causes a compiler error when trying to compile the wrapper.

Best, H

[HugoStrand]

This problem also arise in cthyb where the wrapping still is not automatic since the types given as arguments to methods of the solver_core class are not in the list of detected dependencies. Hence, cpp2py does not add the required modules

import pytriqs.statistics.histograms
import pytriqs.atom_diag

nor the required include

#include <triqs/cpp2py_converters/arrays.hpp>

what is special with these modules is that the solver_core dependency on them is only through class method arguments.