inf.h 1.1 KB

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  1. /* `INFINITY' constant for IEEE 754 machines.
  2. Copyright (C) 2004 Free Software Foundation, Inc.
  3. This file is part of the GNU C Library.
  4. The GNU C Library is free software; you can redistribute it and/or
  5. modify it under the terms of the GNU Lesser General Public
  6. License as published by the Free Software Foundation; either
  7. version 2.1 of the License, or (at your option) any later version.
  8. The GNU C Library is distributed in the hope that it will be useful,
  9. but WITHOUT ANY WARRANTY; without even the implied warranty of
  10. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11. Lesser General Public License for more details.
  12. You should have received a copy of the GNU Lesser General Public
  13. License along with the GNU C Library; if not, write to the Free
  14. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  15. 02111-1307 USA. */
  16. #ifndef _MATH_H
  17. # error "Never use <bits/inf.h> directly; include <math.h> instead."
  18. #endif
  19. /* IEEE positive infinity. */
  20. #if __GNUC_PREREQ(3,3)
  21. # define INFINITY (__builtin_inff())
  22. #else
  23. # define INFINITY HUGE_VALF
  24. #endif