lib/minmax.h

   1 /* MIN, MAX macros.
   2    Copyright (C) 1995, 1998, 2001, 2003, 2005, 2009-2024 Free Software
   3    Foundation, Inc.
   4
   5    This file is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU Lesser General Public License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    License, or (at your option) any later version.
   9
  10    This file is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public License
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 #ifndef _MINMAX_H
  19 #define _MINMAX_H
  20
  21 /* Note: MIN, MAX are also defined in <sys/param.h> on some systems
  22    (glibc, IRIX, HP-UX, OSF/1).  Therefore you might get warnings about
  23    MIN, MAX macro redefinitions on some systems; the workaround is to
  24    #include this file as the last one among the #include list.  */
  25
  26 /* This file uses HAVE_MINMAX_IN_LIMITS_H, HAVE_MINMAX_IN_SYS_PARAM_H.  */
  27 #if !_GL_CONFIG_H_INCLUDED
  28  #error "Please include config.h first."
  29 #endif
  30
  31 /* Before we define the following symbols we get the <limits.h> file
  32    since otherwise we get redefinitions on some systems if <limits.h> is
  33    included after this file.  Likewise for <sys/param.h>.
  34    If more than one of these system headers define MIN and MAX, pick just
  35    one of the headers (because the definitions most likely are the same).  */
  36 #if HAVE_MINMAX_IN_LIMITS_H
  37 # include <limits.h>
  38 #elif HAVE_MINMAX_IN_SYS_PARAM_H
  39 # include <sys/param.h>
  40 #endif
  41
  42 /* Note: MIN and MAX should be used with two arguments of the
  43    same type.  They might not return the minimum and maximum of their two
  44    arguments, if the arguments have different types or have unusual
  45    floating-point values.  For example, on a typical host with 32-bit 'int',
  46    64-bit 'long long', and 64-bit IEEE 754 'double' types:
  47
  48      MAX (-1, 2147483648) returns 4294967295.
  49      MAX (9007199254740992.0, 9007199254740993) returns 9007199254740992.0.
  50      MAX (NaN, 0.0) returns 0.0.
  51      MAX (+0.0, -0.0) returns -0.0.
  52
  53    and in each case the answer is in some sense bogus.  */
  54
  55 /* MAX(a,b) returns the maximum of A and B.  */
  56 #ifndef MAX
  57 # define MAX(a,b) ((a) > (b) ? (a) : (b))
  58 #endif
  59
  60 /* MIN(a,b) returns the minimum of A and B.  */
  61 #ifndef MIN
  62 # define MIN(a,b) ((a) < (b) ? (a) : (b))
  63 #endif
  64
  65 #endif /* _MINMAX_H */