virtual void printJson (json_value *node, int indent=0, const string & name = NULL)
    {
        if (node != NULL)
        {
            switch (node->type)
            {
                case json_null:
                    cout<<"NULL" << endl;
                    break;
                case json_boolean:
                    cout<<"BOOLEAN: " << node->u.boolean << endl;
                    break;
                case json_integer:
                    cout<<"INTEGER: " << node->u.integer << endl;
                    break;
                case json_double:
                    cout<<"DOUBLE: " << node->u.dbl << endl;
                    break;
                case json_string:
                    cout<<"STRING: " << new string (node->u.string.ptr) << endl;
                    break;
                case json_object:
                    cout<<"OBJECT: " << endl;
                    for (int i=0; i <node->u.object.length; i++)
                    {
                        printJson(node->u.object.values[i].value, indent + 1, node->u.object.values[i].name);
                    }
                    break;
                case json_array:
                    cout<<"ARRAY: " << endl;
                    for (int i=0; i <node->u.array.length; i++)
                    {
                        printJson(node->u.array.values[i], indent + 1);
                    }
                    break;
            }
        }
    }