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Created Templates and SWIG

I have the following problem that I do not know how to solve. I want to create a Java wrapper using SWIG for these two classes that are in the same file:

utilities.h:

template<class T>
class EncoderInterface
{
 public:
  virtual ~EncoderInterface()
  {
  }
  virtual const cdap_rib::SerializedObject* encode(const T &object) = 0;
  virtual T* decode(
      const cdap_rib::SerializedObject &serialized_object) const = 0;
};

class IntEncoder : public rib::EncoderInterface<int>
{
 public:
  const cdap_rib::SerializedObject* encode(const int &object);
  int* decode(const cdap_rib::SerializedObject &serialized_object) const;
};

Then I do the usual swig stuff in .i:

%{
#include "utilities.h"
%}

%include "utilities.h"

And he says:

Warning 401: Nothing known about base class 'EncoderInterface< int >'. Ignored.
Warning 401: Maybe you forgot to instantiate 'EncoderInterface< int >' using %template.

If I try to use the% template thing like this:

%template(IntEncoder) EncoderInterface<int>;

Warning 302: Identifier 'IntEncoder' redefined (ignored) (Renamed from 'EncoderInterface< int >'),
utilities.h:302: Warning 302: previous definition of 'IntEncoder'.

IntEncoderhas a code in utilities.cc, and I want the user of utilities to create new instances of the templates or use this if he wants. I do not want to change the name IntEncoder, so any library user (from C ++ or Java) will use the same names.

I read something about file sharing (saving a EncoderInterfacetemplate in one file and creating an instance in another) - is this the only solution to this problem? I do not want to create new files if I can avoid it.

+4
1
Warning 401: Nothing known about base class 'EncoderInterface< int >'. Ignored.
Warning 401: Maybe you forgot to instantiate 'EncoderInterface< int >' using %template.

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%template(IntEncoder) EncoderInterface<int>;

Warning 302: Identifier 'IntEncoder' redefined (ignored) (Renamed from 'EncoderInterface< int >'),
utilities.h:302: Warning 302: previous definition of 'IntEncoder'.

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#ifndef SWIG
template<class T>
class EncoderInterface
{
 public:
  virtual ~EncoderInterface()
  {
  }
  virtual const cdap_rib::SerializedObject* encode(const T &object) = 0;
  virtual T* decode(
      const cdap_rib::SerializedObject &serialized_object) const = 0;
};
#endif

class IntEncoder
#ifndef SWIG
   : public EncoderInterface<int>
#endif
{
 public:
  const cdap_rib::SerializedObject* encode(const int &object);
  int* decode(const cdap_rib::SerializedObject &serialized_object) const;
};

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