ale_math.h

   1 // Copyright 2002, 2003, 2004, 2005, 2006 David Hilvert <dhilvert@auricle.dyndns.org>,
   2 //                                                      <dhilvert@ugcs.caltech.edu>
   3
   4 /*  This file is part of the Anti-Lamenessing Engine.
   5
   6     The Anti-Lamenessing Engine 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     The Anti-Lamenessing Engine 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 the Anti-Lamenessing Engine; if not, write to the Free Software
  18     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19 */
  20
  21 #ifndef __ale_math_h__
  22 #define __ale_math_h__
  23
  24 /*
  25  * Certain versions of Mac OSX may disable math.h definitions of is*() macros
  26  * when iostream is included, so we include the latter here.
  27  */
  28
  29 #include <math.h>
  30 #include <iostream>
  31
  32 /*
  33  * isnan() and isinf() code logic are based on those noted in the GNU Autoconf
  34  * manual, by the Free Software Foundation:
  35  *
  36  * http://www.gnu.org/software/autoconf/manual/html_node/Function-Portability.html
  37  *
  38  * As C++ is available here, we use C++ overloading instead of sizeof()
  39  * switches to handle different types.
  40  */
  41
  42 #ifndef isnan
  43 # define isnan(x) ale_isnan(x)
  44 static inline int ale_isnan(float       x) { return x != x; }
  45 static inline int ale_isnan(double      x) { return x != x; }
  46 static inline int ale_isnan(long double x) { return x != x; }
  47 #endif
  48
  49 #ifndef isinf
  50 # define isinf(x) ale_isinf(x)
  51 static inline int ale_isinf(float       x) { return isnan (x - x); }
  52 static inline int ale_isinf(double      x) { return isnan (x - x); }
  53 static inline int ale_isinf(long double x) { return isnan (x - x); }
  54 #endif
  55
  56 #endif