public:
typedef std::vector<Attributes> attributes_list;
Canvas(int x = 0, int y = 0, int width = 0, int height = 0) :
Canvas(int x = 0, int y = 0, int width = 1, int height = 1) :
m_window(newwin(height, width, y, x)) {}
~Canvas() { delwin(m_window); }
