flower/include/compare.hh

   1 /*
   2   flowerlib
   3
   4   (c) 1996--2005 Han-Wen Nienhuys
   5 */
   6 #ifndef COMPARE_HH
   7 #define COMPARE_HH
   8
   9 #define ONE_OPERATOR(type, function, op)        \
  10   inline bool                                   \
  11   operator op (type t1, type t2)                \
  12   {                                             \
  13     return function (t1, t2) op 0;              \
  14   }
  15
  16 /**  handy notations for a signed comparison.
  17      make the operators{<,<=,==,>=,>} and the MAX and MIN of two.
  18      Please fill a & in the type argument if necessary.
  19 */
  20 #define TEMPLATE_INSTANTIATE_COMPARE(type, function, prefix)            \
  21   prefix ONE_OPERATOR (type, function, >)                               \
  22     prefix ONE_OPERATOR (type, function, >=)                            \
  23     prefix ONE_OPERATOR (type, function, ==)                            \
  24     prefix ONE_OPERATOR (type, function, !=)                            \
  25     prefix ONE_OPERATOR (type, function, <)                             \
  26     prefix ONE_OPERATOR (type, function, <=)                            \
  27     prefix inline type max (type t1, type t2) { return (t1 > t2) ? t1 : t2; } \
  28   prefix inline type min (type t1, type t2) { return (t1 < t2) ? t1 : t2; } \
  29                                                                         \
  30   prefix bool operator < (type t1, type t2) /* stupid fix to allow ; */
  31
  32 #define INSTANTIATE_COMPARE(type, func) TEMPLATE_INSTANTIATE_COMPARE (type, func,)
  33
  34 #endif
  35