Define a const static object variable inside the class

Question

I need to create a static object inside a class definition. It is possible in Java, but in C++ I get an error:

../PlaceID.h:9:43: error: invalid use of incom         


        

Answer 1

You can't define the member variable because the class isn't fully defined yet. You have to do like this instead:

class PlaceID {

public:

    inline PlaceID(const std::string placeName):mPlaceName(placeName) {}

    const static PlaceID OUTSIDE;

private:
    std::string mPlaceName;
};

const PlaceID PlaceID::OUTSIDE = PlaceID("");