flower/include/drul-array.hh

   1 /*
   2   drul-array.hh -- declare Drul_array
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9
  10 #ifndef DRUL_ARRAY_HH
  11 #define DRUL_ARRAY_HH
  12
  13 #include "direction.hh"
  14
  15 #include <assert.h>
  16
  17 /**
  18   Left/right or Up/down arrays. Drul is nicer sounding than udlr
  19  */
  20 template<class T>
  21 struct Drul_array
  22 {
  23   T array_[2];
  24   T &elem (Direction d)
  25     {
  26       assert (d==1 || d== -1);
  27       return array_[(d+1)/2];
  28
  29     }
  30   T &operator[] (Direction d)
  31   {
  32     return elem (d);
  33   }
  34   T elem (Direction d) const
  35     {
  36     assert (d==1 || d== -1);
  37     return array_[(d+1)/2];
  38     }
  39
  40   T operator[]  (Direction d) const
  41   {
  42     return elem (d);
  43   }
  44   Drul_array ()
  45     {}
  46   Drul_array (T t1, T t2)
  47     {
  48       array_[0] = t1;
  49       array_[1] = t2;
  50     }
  51 };
  52
  53 #endif // DRUL_ARRAY_HH