Getting and setting Gstreamer element properties using C++

Question

I'm writing a minimal C++ wrapper around the Gstreamer library. I have a class Element, which represents an Gstreamer element.

class Element
{
private:
    property* properties; 
public:
    gchar* name;
    GstElement* type; //represents the actual element
    Element();
    Element(gchar* name, gchar* type);
    Element(gchar * type);
    ~Element();
    void set_property(gchar* name, gchar* value);
    void set_property(gchar* name, gint value);
    void set_property(gchar* name, gfloat value);
    void get_property(gchar* name);
    int link_with(Element& e);   
};

set_property is straight forward:

    void Element::set_property(gchar* name, gchar* value) {
        g_object_set(this->type, name, value, NULL);
        // include further validations
    }

1. I'm overloading the methods set_property because of the different value types that can occour. Is this the way to go? Or is there a way to unify the value parameter?

2. How do I get a property without knowing its value type? The documentation suggest this example:

    gint intval;
    gchar *strval;
    GObject *objval;
    //my_object would be the Gstreamer element
     g_object_get (my_object,
                   "int-property", &intval,
                   "str-property", &strval,
                   "property-name", &objval,
                   NULL);
   
     // Do something with intval, strval, objval
   
     g_free (strval);
     g_object_unref (objval);
   

How do I check which variable intval, strval, objval was set?

PS: I can't use the official Gstreamer C++ wrapper, since it's not in active development and there is no real documentation about the usage.