7 Dimension() : w(0), a(0), d(0) {}
9 Dimension(int ww, int aa, int dd) : w(ww), a(aa), d(dd) {}
12 void operator+=(Dimension const & dim);
14 void clear() { w = a = d = 0; }
16 int height() const { return a + d; }
18 int ascent() const { return a; }
20 int width() const { return w; }