1 /* gsl_nan.h 2 * 3 * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 Gerard Jungman, Brian Gough 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 3 of the License, or (at 8 * your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, but 11 * WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 18 * USA. 19 */ 20 21 #ifndef __GSL_NAN_H__ 22 #define __GSL_NAN_H__ 23 24 #ifdef INFINITY 25 #define GSL_POSINF INFINITY 26 #define GSL_NEGINF (-INFINITY) 27 #elif defined(HUGE_VAL) 28 #define GSL_POSINF HUGE_VAL 29 #define GSL_NEGINF (-HUGE_VAL) 30 #else 31 #define GSL_POSINF (gsl_posinf()) 32 #define GSL_NEGINF (gsl_neginf()) 33 #endif 34 35 #ifdef NAN 36 #define GSL_NAN NAN 37 #elif defined(INFINITY) 38 #define GSL_NAN (INFINITY / INFINITY) 39 #else 40 #define GSL_NAN (gsl_nan()) 41 #endif 42 43 #define GSL_POSZERO (+0.0) 44 #define GSL_NEGZERO (-0.0) 45 46 #endif /* __GSL_NAN_H__ */ 47