1/* MIN, MAX macros. 2 Copyright (C) 1995, 1998, 2001, 2003 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 2, or (at your option) 7 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, write to the Free Software Foundation, 16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 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/* Before we define the following symbols we get the <limits.h> file 27 since otherwise we get redefinitions on some systems. */ 28#include <limits.h> 29 30/* Note: MIN and MAX should preferrably be used with two arguments of the 31 same type. They might not return the minimum and maximum of their two 32 arguments, if the arguments have different types or have unusual 33 floating-point values. For example, on a typical host with 32-bit 'int', 34 64-bit 'long long', and 64-bit IEEE 754 'double' types: 35 36 MAX (-1, 2147483648) returns 4294967295. 37 MAX (9007199254740992.0, 9007199254740993) returns 9007199254740992.0. 38 MAX (NaN, 0.0) returns 0.0. 39 MAX (+0.0, -0.0) returns -0.0. 40 41 and in each case the answer is in some sense bogus. */ 42 43/* MAX(a,b) returns the maximum of A and B. */ 44#ifndef MAX 45# if __STDC__ && defined __GNUC__ && __GNUC__ >= 2 46# define MAX(a,b) (__extension__ \ 47 ({__typeof__ (a) _a = (a); \ 48 __typeof__ (b) _b = (b); \ 49 _a > _b ? _a : _b; \ 50 })) 51# else 52# define MAX(a,b) ((a) > (b) ? (a) : (b)) 53# endif 54#endif 55 56/* MIN(a,b) returns the minimum of A and B. */ 57#ifndef MIN 58# if __STDC__ && defined __GNUC__ && __GNUC__ >= 2 59# define MIN(a,b) (__extension__ \ 60 ({__typeof__ (a) _a = (a); \ 61 __typeof__ (b) _b = (b); \ 62 _a < _b ? _a : _b; \ 63 })) 64# else 65# define MIN(a,b) ((a) < (b) ? (a) : (b)) 66# endif 67#endif 68 69#endif /* _MINMAX_H */ 70