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     make the operators{<,<=,==,>=,>} and the MAX and MIN of two.
  33     Please fill a & in the type argument if necessary.
  34     */
  35 #define template_instantiate_compare(type, function, prefix) \
  36 prefix one_operator(type, function, >)\
  37 prefix one_operator(type, function, >=)\
  38 prefix one_operator(type, function, ==)\
  39 prefix one_operator(type, function, !=)\
  40 prefix one_operator(type, function, <)\
  41 prefix one_operator(type, function, <=)\
  42 gpp_minmax(type, prefix)\
  43 prefix inline type max(type t1, type t2) {  return (t1 > t2 )? t1 : t2; }\
  44 prefix inline type min(type t1, type t2) {  return (t1 < t2 )? t1 : t2; }\
  45   \
  46 prefix  bool operator<(type t1, type t2) /* stupid fix to allow ; */
  47
  48
  49
  50 #define instantiate_compare(type, func) template_instantiate_compare(type,func, )
  51
  52
  53
  54 #endif
  55