+ void append_index(unsigned);
+ virtual unsigned get_data_size() const { return data.size(); }
+ virtual const void *get_data_pointer() const { return &data[0]; }
+ virtual unsigned get_alignment() const { return get_index_size(); }
+ unsigned get_index_size() const;
+public:
+ unsigned size() const { return data.size()/get_index_size(); }
+
+ unsigned get_index(unsigned) const;
+
+ void draw() const;