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lo-ieee.h

解説を見る。

/*

Copyright (C) 1996, 1997 John W. Eaton

This file is part of Octave.

Octave is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.

Octave 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 General Public License
for more details.

You should have received a copy of the GNU General Public License
along with Octave; see the file COPYING.  If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/

#if !defined (octave_liboctave_ieee_h)
#define octave_liboctave_ieee_h 1

#ifdef  __cplusplus
extern "C" {
#endif

/*  Octave's idea of infinity.  */
extern double octave_Inf;

/* Octave's idea of a missing value.  */
extern double octave_NA;

/* Octave's idea of not a number.  */
extern double octave_NaN;

extern int lo_ieee_hw;
extern int lo_ieee_lw;

typedef union
{
  double value;
  unsigned int word[2];
} lo_ieee_double;

#define LO_IEEE_NA_HW 0x7ff00000
#define LO_IEEE_NA_LW 1954

extern void octave_ieee_init (void);

#if defined (SCO)
extern int isnan (double);
extern int isinf (double);
#endif

extern int lo_ieee_isnan (double x);
extern int lo_ieee_finite (double x);
extern int lo_ieee_isinf (double x);

extern int lo_ieee_is_NA (double);
extern int lo_ieee_is_NaN_or_NA (double);

extern double lo_ieee_inf_value (void);
extern double lo_ieee_na_value (void);
extern double lo_ieee_nan_value (void);

/* In the following definitions, only check x < 0 explicitly to avoid
   a function call when it looks like signbit or copysign are actually
   functions.  */

#if defined (signbit)
#define lo_ieee_signbit(x) signbit (x)
#elif defined (HAVE_SIGNBIT)
#if defined (__MINGW32__)
extern int signbit (double);
#endif
#define lo_ieee_signbit(x) (x < 0 || signbit (x))
#elif defined (copysign)
#define lo_ieee_signbit(x) (copysign (1.0, x) < 0)
#elif defined (HAVE_COPYSIGN)
#define lo_ieee_signbit(x) (x < 0 || copysign (1.0, x) < 0)
#else
#define lo_ieee_signbit(x) 0
#endif

#ifdef  __cplusplus
}
#endif

#endif

/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/

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