flower/compare.hh

   1 /*
   2   flowerlib
   3
   4   (c) 1996 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     return function(t1, t2) op 0;\
  13 }\
  14
  15 #define gpp_minmax_operator(type, op, opp) \
  16 inline type \
  17 operator op(type t1, type t2)\
  18 {\
  19      return (t1 opp t2) ? t1 :  t2;\
  20 }\
  21
  22
  23 #if defined (__GNUG__) && ! defined (__STRICT_ANSI__)
  24 #define gpp_minmax(type, prefix)\
  25        prefix gpp_minmax_operator(type, <?, <)\
  26        prefix gpp_minmax_operator(type, >?, >)
  27 #else
  28 #define gpp_minmax(type, prefix)
  29 #endif
  30
  31 /// handy notations for a signed comparison
  32 #define template_instantiate_compare(type, function, prefix) \
  33 prefix one_operator(type, function, >)\
  34 prefix one_operator(type, function, >=)\
  35 prefix one_operator(type, function, ==)\
  36 prefix one_operator(type, function, !=)\
  37 prefix one_operator(type, function, <)\
  38 prefix one_operator(type, function, <=)\
  39 gpp_minmax(type, prefix)\
  40 prefix inline type max(type t1, type t2) {  return (t1 > t2 )? t1 : t2; }\
  41 prefix inline type min(type t1, type t2) {  return (t1 < t2 )? t1 : t2; }\
  42   \
  43 prefix  bool operator<(type t1, type t2) /* stupid fix to allow ; */
  44      /**
  45     make the operators{<,<=,==,>=,>} and the MAX and MIN of two.
  46     Please fill a & in the type argument if necessary.
  47     */
  48
  49
  50
  51 #define instantiate_compare(type, func) template_instantiate_compare(type,func, )
  52
  53
  54
  55 #endif
  56