Constants.h

/*CXXR $Id: Constants.h 1348 2013-02-25 17:49:03Z arr $
 *CXXR
 *CXXR This file is part of CXXR, a project to refactor the R interpreter
 *CXXR into C++.  It may consist in whole or in part of program code and
 *CXXR documentation taken from the R project itself, incorporated into
 *CXXR CXXR (and possibly MODIFIED) under the terms of the GNU General Public
 *CXXR Licence.
 *CXXR 
 *CXXR CXXR is Copyright (C) 2008-13 Andrew R. Runnalls, subject to such other
 *CXXR copyrights and copyright restrictions as may be stated below.
 *CXXR 
 *CXXR CXXR is not part of the R project, and bugs and other issues should
 *CXXR not be reported via r-bugs or other R project channels; instead refer
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 *CXXR */

/*
 *  R : A Computer Language for Statistical Data Analysis
 *  Copyright (C) 1995, 1996  Robert Gentleman and Ross Ihaka
 *  Copyright (C) 1998-2012   The R Core Team.
 *
 *  This program 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 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
 *  http://www.r-project.org/Licenses/
 */

#ifndef R_EXT_CONSTANTS_H_
#define R_EXT_CONSTANTS_H_

/* usually in math.h, but not with strict C99 compliance */
#ifndef M_PI
#define M_PI 3.141592653589793238462643383279502884197169399375
#endif

#ifndef STRICT_R_HEADERS
#define PI             M_PI
#include <float.h>  /* Defines the rest, at least in C99 */
#define SINGLE_EPS     FLT_EPSILON
#define SINGLE_BASE    FLT_RADIX
#define SINGLE_XMIN    FLT_MIN
#define SINGLE_XMAX    FLT_MAX
#define DOUBLE_DIGITS  DBL_MANT_DIG
#define DOUBLE_EPS     DBL_EPSILON
#define DOUBLE_XMAX    DBL_MAX
#define DOUBLE_XMIN    DBL_MIN
#endif

#endif /* R_EXT_CONSTANTS_H_ */