10 static const Symbol
*find_ball(int);
11 static const Symbol
*find_rest(int);
12 static const Symbol
*find_bar(String
);
16 /// a symbol with a variable width
17 struct Stretchable_symbol
{
20 /// return a string for a symbol in this width.
21 virtual String
operator ()(Real width
)=0;
22 virtual Interval
height(Real width
) const =0;
23 static const Stretchable_symbol
* get_linestaff(int n
);