libs/property.h

   1 /* Quarn OS
   2  *
   3  * Lambda operator and properties
   4  *
   5  * Copyright (C) 2009 Pawel Dziepak
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  */
  22
  23 #define glue(a, b)
  24
  25 #define __LAMBDA glue(__lambda, __COUNTER__)
  26 #define __PROPERTY glue(__property, __COUNTER__)
  27
  28 #define lambda(t, a, x) struct __LAMBDA { t operator() a { x } }
  29
  30 #define property(T, set, get)   class __PROPERTY {                      \
  31                                 private:                                \
  32                                         set _set;                       \
  33                                         get _get;                       \
  34                                 public:                                 \
  35                                         void operator=(T val) {         \
  36                                                 _set(val);              \
  37                                         }                               \
  38                                         operator T() {                  \
  39                                                 return _get();          \
  40                                         }                               \
  41                                 }
  42
  43 /*
  44  Usage:
  45
  46 property(int,
  47         lambda(void, (int x), printf("%d\n", x);),
  48         lambda(int, (void), return 5;)) value;
  49
  50  */