[IronPython] Exposing C++/CLI template classes to ironpython

[Dino Viehland]

Unfortunately you can't the CPython extension libraries w/ IronPython.  You could do it w/ templates instead of macros and force the instantiation of the generic public class like:

template<typename T> class NativeData {
public:
        T foo;
};

template<typename T> public ref class GenericData {
private:
        NativeData<T> *data;
};

public ref class GDI : GenericData<int> {};
public ref class GDC : GenericData<char> {};

That seems to export both the GenericData<int> and GenericData<char> types (even if GDI/GDC are private) though maybe there's a better way to force the GenericData<x> type to get exported.

-----Original Message-----
From: users-bounces at lists.ironpython.com [mailto:users-bounces at lists.ironpython.com] On Behalf Of "Bernhard Mäder"
Sent: Sunday, December 31, 2006 9:15 AM
To: users at lists.ironpython.com
Subject: [IronPython] Exposing C++/CLI template classes to ironpython

Hello all

I'm starting to work with ironpython and have successfully exported some .NET classes into an extension library.

Now I'm trying to get some C++ template classes to work with ironpython. I'm doing something like this:

// This is our C++ class.
template<typename T> struct cpp_klass
{
   T foo() { return T(); }
}

// This wraps the class for a specific T
public ref class klass_uint8
{
    typedef cpp_klass<unsigned char> klass_t;
    klass_t * _klass;

    klass_uint8() : _klass(new klass_t()) {};
    ~klass_uint8() {delete _klass;}

    unsigned char foo()
    {
        return _klass.foo();
    }
};

This works but has do be done for each version of T. I'm about to write a big macro that does it for all cpp_class<T> versions, but don't think this will be a nice solution... Is there a better way to do it?

Or would it be possible to load CPython extension DLLs with ironpython? If yes, I could use boost.python to get the exports done.

Thanks for any help!

cheers
Bernhard
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