Help with shared pointers and std::pair

Is anyone able to help with the following:


I have the following code:


test.h




#pragma once

#include <string>


#include <memory>


#include <utility>

class Test {


  public:


  std::pair<std::shared_ptr<std::string>, int> test(bool isNull) {


    return isNull ? std::make_pair(nullptr, 0) : std::make_pair(std::make_shared<std::string>("test"), 3);


  }

  std::pair<std::string, int> another(bool isNull) {


      return isNull ? std::make_pair("", 5) : std::make_pair("something", 8);


  }


};



test.i

%module "test"

%include "std_shared_ptr.i"
%include "std_string.i"



%shared_ptr( std::string )

%template(Thingy) std::shared_ptr< std::string >;


%template(SmartPair) std::pair< std::shared_ptr< std::string >, int >;


%template(StringInt) std::pair< std::string, int >;

%include "test.h"

check.py

import test
t = test.Test()

print(t.test(True))
print(t.test(False))

print(t.another(True))
print(t.another(False))

The output of python check.py is:

(<test.Thingy; proxy of <Swig Object of type 'std::shared_ptr< std::string > *' at 0x11052eab0> >, 0)
(<test.Thingy; proxy of <Swig Object of type 'std::shared_ptr< std::string > *' at 0x11052eab0> >, 3)

('', 5)
('something', 8)


But what I would like to see is:


(None, 0)
(<test.Thingy; proxy of <Swig Object of type 'std::shared_ptr< std::string > *' at 0x11052eab0> >, 3)

('', 5)
('something', 8)

Is someone able to explain what is going on here please?

Many thanks.

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