/usr/include/BoxLib/REAL.H is in libbox-dev 2.5-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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** (c) 1996-2000 The Regents of the University of California (through
** E.O. Lawrence Berkeley National Laboratory), subject to approval by
** the U.S. Department of Energy. Your use of this software is under
** license -- the license agreement is attached and included in the
** directory as license.txt or you may contact Berkeley Lab's Technology
** Transfer Department at TTD@lbl.gov. NOTICE OF U.S. GOVERNMENT RIGHTS.
** The Software was developed under funding from the U.S. Government
** which consequently retains certain rights as follows: the
** U.S. Government has been granted for itself and others acting on its
** behalf a paid-up, nonexclusive, irrevocable, worldwide license in the
** Software to reproduce, prepare derivative works, and perform publicly
** and display publicly. Beginning five (5) years after the date
** permission to assert copyright is obtained from the U.S. Department of
** Energy, and subject to any subsequent five (5) year renewals, the
** U.S. Government is granted for itself and others acting on its behalf
** a paid-up, nonexclusive, irrevocable, worldwide license in the
** Software to reproduce, prepare derivative works, distribute copies to
** the public, perform publicly and display publicly, and to permit
** others to do so.
*/
#ifndef BL_REAL_H
#define BL_REAL_H
/*
* $Id: REAL.H,v 1.13 2002/06/04 16:48:48 car Exp $
*/
#ifdef BL_USE_FLOAT
# undef BL_USE_DOUBLE
# undef BL_USE_FLOAT
/*@ManDoc:
The macro BL\_USE\_FLOAT indicates that C++ floating-point calculations should
use "float" variables and Fortran floating-point calculations should use
"real*4" variables. One of BL\_USE\_FLOAT or BL\_USE\_DOUBLE must always be
defined when compiling and using BoxLib.
*/
# define BL_USE_FLOAT 1
#else
# undef BL_USE_FLOAT
# undef BL_USE_DOUBLE
/*@ManDoc:
The macro BL\_USE\_DOUBLE indicates that C++ floating-point calculations
should use "double" variables and Fortran floating-point calculations
should use "real*8" variables. One of BL\_USE\_FLOAT or BL\_USE\_DOUBLE must
always be defined when compiling and using BoxLib. This macro is not
allowed on Cray architectures; i.e. only BL\_USE\_FLOAT is allowed on Cray
architectures.
*/
# define BL_USE_DOUBLE 1
#endif
#if !defined(BL_LANG_FORT)
/*@ManDoc:
Real is a typedef specifying the precision of the floating-point
calculations in C++ code. It will be either `float' or `double'
depending upon which of the macros BL\_USE\_FLOAT or
BL\_USE\_DOUBLE, respectively, is defined during compilations. For
portability, you should write floating-point code in terms of this
typedef, instead of using `float' or `double' directly.
Note that exactly one of these macros must be defined
when compiling any module that uses floating-point. Also,
on Cray architectures all floating-point computations are done in 64 bits.
*/
#ifdef BL_USE_FLOAT
typedef float Real;
#else
typedef double Real;
#endif
#else
/*@ManDoc:
The REAL\_T macro specifies the precision of the floating-point
calculations in Fortran code. It will be either `real*4' or
`real*8' depending upon which of the symbols BL\_USE\_FLOAT or
BL\_USE\_DOUBLE, respectively, is defined during compilations. For
portability, you should write floating-point code in terms of this
macro, instead of using `real*4' or `real*8' directly.
Note that exactly one of these macros must be defined
when compiling any module that uses floating-point. Also,
on Cray architectures all floating-point computations are done in 64 bits.
*/
#ifdef BL_USE_FLOAT
#ifdef BL_USE_FORT_STAR_PRECISION
# define REAL_T real*4
#else
# define REAL_T REAL
#endif
#if __STDC__==1
# define BL_REAL(a) a##E0
# define BL_REAL_E(a,b) a##E##b
#else
# define BL_REAL(a) a/**/E0
# define BL_REAL_E(a,b) a/**/E/**/b
#endif
#else
#ifdef BL_USE_FORT_STAR_PRECISION
# define REAL_T real*8
#else
# define REAL_T DOUBLE PRECISION
#endif
#if __STDC__==1
# define BL_REAL(a) a##D0
# define BL_REAL_E(a,b) a##D##b
#else
# define BL_REAL(a) a/**/D0
# define BL_REAL_E(a,b) a/**/D/**/b
#endif
#endif
#endif /* !BL_LANG_FORT */
#if defined(BL_ARCH_CRAY)
# if !defined(BL_USE_FLOAT)
# error BL_USE_FLOAT required on CRAY architectures
# endif
#endif
#endif /*BL_REAL_H*/
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