flower/include/compare.hh

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1996--2011 Han-Wen Nienhuys
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19 #ifndef COMPARE_HH
  20 #define COMPARE_HH
  21
  22 #define ONE_OPERATOR(type, function, op)        \
  23   inline bool                                   \
  24   operator op (type t1, type t2)                \
  25   {                                             \
  26     return function (t1, t2) op 0;              \
  27   }
  28
  29 /**  handy notations for a signed comparison.
  30      make the operators{<,<=,==,>=,>} and the MAX and MIN of two.
  31      Please fill a & in the type argument if necessary.
  32 */
  33 #define TEMPLATE_INSTANTIATE_COMPARE(type, function, prefix)            \
  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     prefix ONE_OPERATOR (type, function, <=)                            \
  40     /* namespace std { */                                               \
  41     prefix inline type max (type t1, type t2) { return (t1 > t2) ? t1 : t2; } \
  42     prefix inline type min (type t1, type t2) { return (t1 < t2) ? t1 : t2; } \
  43   /* } */                                                               \
  44   /* stupid fix to allow ; */                                           \
  45   prefix bool operator < (type t1, type t2)
  46
  47 #define INSTANTIATE_COMPARE(type, func) TEMPLATE_INSTANTIATE_COMPARE (type, func,)
  48
  49 #endif
  50