[C++-sig] how to access live c++ object?

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This is my class
class CT
{
public:
 CT() {};
 ~CT() {};
 int GetNum( void )   { return num; }
 void SetNum( int n )  { num = n; }

private:
 int num;
};

static CT ct;

CT & getCT( void )
{
 return ct;
}

I want to access ct object from boost.python, thanks for your advice.