#ifndef IDEALSPACING_HH
#define IDEALSPACING_HH
#include "lily-proto.hh"
+#include "drul-array.hh"
/// ideal spacing between two columns
struct Idealspacing {
Real hooke_f_;
/// the two columns
- int left_i_;
- int right_i_;
+ Drul_array<int> cols_drul_;
Real energy_f (Real x) const;
void print() const;