| /* |
| * R : A Computer Language for Statistical Data Analysis |
| * Copyright (C) 1995, 1996 Robert Gentleman and Ross Ihaka |
| * Copyright (C) 1998--2016 The R Core Team. |
| * |
| * This header file is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU Lesser General Public License as published by |
| * the Free Software Foundation; either version 2.1 of the License, or |
| * (at your option) any later version. |
| * |
| * This file is part of R. R is distributed under the terms of the |
| * GNU General Public License, either Version 2, June 1991 or Version 3, |
| * June 2007. See doc/COPYRIGHTS for details of the copyright status of R. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public License |
| * along with this program; if not, a copy is available at |
| * https://www.R-project.org/Licenses/ |
| */ |
| |
| /* Included by R.h: API */ |
| |
| #ifndef R_ARITH_H_ |
| #define R_ARITH_H_ |
| |
| /* |
| This used to define _BSD_SOURCE to make declarations of isfinite |
| and isnan visible in glibc. But that was deprecated in glibc 2.20, |
| and --std=c99 suffices nowadays. |
| */ |
| |
| #include <R_ext/libextern.h> |
| #ifdef __cplusplus |
| extern "C" { |
| #else |
| /* needed for isnan and isfinite, neither of which are used under C++ */ |
| # include <math.h> |
| #endif |
| |
| /* implementation of these : ../../main/arithmetic.c */ |
| LibExtern double R_NaN; /* IEEE NaN */ |
| LibExtern double R_PosInf; /* IEEE Inf */ |
| LibExtern double R_NegInf; /* IEEE -Inf */ |
| LibExtern double R_NaReal; /* NA_REAL: IEEE */ |
| LibExtern int R_NaInt; /* NA_INTEGER:= INT_MIN currently */ |
| #ifdef __MAIN__ |
| #undef extern |
| #undef LibExtern |
| #endif |
| |
| #define NA_LOGICAL R_NaInt |
| #define NA_INTEGER R_NaInt |
| /* #define NA_FACTOR R_NaInt unused */ |
| #define NA_REAL R_NaReal |
| /* NA_STRING is a SEXP, so defined in Rinternals.h */ |
| |
| int R_IsNA(double); /* True for R's NA only */ |
| int R_IsNaN(double); /* True for special NaN, *not* for NA */ |
| int R_finite(double); /* True if none of NA, NaN, +/-Inf */ |
| #define ISNA(x) R_IsNA(x) |
| |
| /* ISNAN(): True for *both* NA and NaN. |
| NOTE: some systems do not return 1 for TRUE. |
| Also note that C++ math headers specifically undefine |
| isnan if it is a macro (it is on macOS and in C99), |
| hence the workaround. This code also appears in Rmath.h |
| */ |
| #ifdef __cplusplus |
| int R_isnancpp(double); /* in arithmetic.c */ |
| # define ISNAN(x) R_isnancpp(x) |
| #else |
| # define ISNAN(x) (isnan(x)!=0) |
| #endif |
| |
| /* The following is only defined inside R */ |
| #ifdef HAVE_WORKING_ISFINITE |
| /* isfinite is defined in <math.h> according to C99 */ |
| # define R_FINITE(x) isfinite(x) |
| #else |
| # define R_FINITE(x) R_finite(x) |
| #endif |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* R_ARITH_H_ */ |