I think reference_existing_object will work.
 And in my opinion, you'd better be careful if you expect that the c++ code and python code are using the same singleton instance.
Because there're two Singleton::_instance if you export the Singleton class to Python. one at c++ side, the other at python side.

2009/2/13 Balasubramanyam, Shivakumar <sbalasub@qualcomm.com>
HI,
 
The am not sure if which call policy I should be using for this particular use case,
 
 
class Singleton
{
public:  
    Singleton* create()
    {
        if(!_instance)
        {
            _instance = new Singleton();
        }           
        return _instance;   
    }
    static Singleton* _instance;
}
 
// Initialization
Singleton* _instance=NULL;
 
Is return_value_policy<reference_existing_object> the right call policy to use?
 
 
Thanks,
Shiva

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