gl/tests/infinity.h

   1 /* Macros for infinity.
   2    Copyright (C) 2011-2012 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  16
  17
  18 /* Infinityf () returns a 'float' +Infinity.  */
  19
  20 /* The Microsoft MSVC 9 compiler chokes on the expression 1.0f / 0.0f.  */
  21 #if defined _MSC_VER
  22 static float
  23 Infinityf ()
  24 {
  25   static float zero = 0.0f;
  26   return 1.0f / zero;
  27 }
  28 #else
  29 # define Infinityf() (1.0f / 0.0f)
  30 #endif
  31
  32
  33 /* Infinityd () returns a 'double' +Infinity.  */
  34
  35 /* The Microsoft MSVC 9 compiler chokes on the expression 1.0 / 0.0.  */
  36 #if defined _MSC_VER
  37 static double
  38 Infinityd ()
  39 {
  40   static double zero = 0.0;
  41   return 1.0 / zero;
  42 }
  43 #else
  44 # define Infinityd() (1.0 / 0.0)
  45 #endif
  46
  47
  48 /* Infinityl () returns a 'long double' +Infinity.  */
  49
  50 /* The Microsoft MSVC 9 compiler chokes on the expression 1.0L / 0.0L.  */
  51 #if defined _MSC_VER
  52 static double
  53 Infinityl ()
  54 {
  55   static long double zero = 0.0L;
  56   return 1.0L / zero;
  57 }
  58 #else
  59 # define Infinityl() (1.0L / 0.0L)
  60 #endif