The R Project SVN R

/*

 *  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: Part of the 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_ */