This worked very well thanks. -----Original Message----- From: Stefan Ring [mailto:stefanrin@gmail.com] Sent: Tuesday, March 05, 2019 12:04 PM To: Development of Python/C++ integration <cplusplus-sig@python.org> Cc: Jones, Torrin A (US) <torrin.jones@baesystems.com> Subject: Re: [C++-sig] Calling python function repr from C++ using boost.python (possible?) *** WARNING *** EXTERNAL EMAIL -- This message originates from outside our organization. On Sat, Mar 2, 2019 at 6:12 PM Jones, Torrin A (US) <torrin.jones@baesystems.com> wrote:

Is it possible to call repr from C++ on a C++ object that can be converted to python? Let me explain.

I have an enum that I converted to python using boost::python::enum_(). That class already provides a good repr() to python (thanks to the boost::python developers for that). However that enum is used as a type on a member in another C++ class that I have where boost::python does not provide a good repr(). So I’m trying to provide one and thought, it sure would be nice if I could just call repr() on the member. I assume I have to convert the value on that member to python first, some kind of way then call repr? Is that possible? Or is there a better way?

Example:

Typedef enum

{

V1 = 0,

V2 = 5,

V3 = 6

} values;

Class ValueExample

{

Public:

ValueExample(const values& v) {m_value = v};

Values getValue() const { return m_value };

Private:

Values m_value;

}

Std::string

ValueExampleRepr(const ValueExample& object)

{

Std::stringstream ss;

// What do I put here?

// Ss << repr(object.getValue());

Return ss::str();

}

Boost::python::enum_<values> values(“values”);

Values.value(“V1”, V1);

Values.value(“V2”, V2);

Values.value(“V3”, V3);

Boost::python::class_<ValueExample> ValueExample(“ValueExample”);

ValueExample(“__repr__”, ValueExampleRepr);

I can only come up with this: Ss << extract<std::string>(boost::python::object(object.getValue()).attr("__repr__")())();