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annotate liboctave/lo-ieee.h @ 7259:9f02c32eb70d ss-2-9-18

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[project @ 2007-12-05 18:02:33 by jwe]
author jwe
date Wed, 05 Dec 2007 18:02:34 +0000
parents a1dbe9d80eee
children 82be108cc558
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1 /*
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2
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3 Copyright (C) 1996, 1997, 2002, 2003, 2004, 2005, 2006, 2007
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4 John W. Eaton
1967
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5
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6 This file is part of Octave.
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7
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8 Octave is free software; you can redistribute it and/or modify it
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9 under the terms of the GNU General Public License as published by the
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10 Free Software Foundation; either version 3 of the License, or (at your
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11 option) any later version.
1967
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12
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13 Octave is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with Octave; see the file COPYING. If not, see
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20 <http://www.gnu.org/licenses/>.
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22 */
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23
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24 #if !defined (octave_liboctave_ieee_h)
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25 #define octave_liboctave_ieee_h 1
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26
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27 #ifdef __cplusplus
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28 extern "C" {
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29 #endif
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30
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31 /* Octave's idea of infinity. */
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32 extern OCTAVE_API double octave_Inf;
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33
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34 /* Octave's idea of a missing value. */
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35 extern OCTAVE_API double octave_NA;
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36
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37 /* Octave's idea of not a number. */
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38 extern OCTAVE_API double octave_NaN;
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39
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40 /* FIXME -- this code assumes that a double has twice the
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41 number of bits as an int */
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42
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43 extern OCTAVE_API int lo_ieee_hw;
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44 extern OCTAVE_API int lo_ieee_lw;
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45
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46 typedef union
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47 {
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48 double value;
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49 unsigned int word[2];
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50 } lo_ieee_double;
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51
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52 #define LO_IEEE_NA_HW 0x7ff00000
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53 #define LO_IEEE_NA_LW 1954
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54
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55 extern OCTAVE_API void octave_ieee_init (void);
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56
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57 #if defined (SCO)
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58 extern int isnan (double);
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59 extern int isinf (double);
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60 #endif
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61
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62 extern OCTAVE_API int lo_ieee_isnan (double x);
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63 extern OCTAVE_API int lo_ieee_finite (double x);
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64 extern OCTAVE_API int lo_ieee_isinf (double x);
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65
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66 extern OCTAVE_API int lo_ieee_is_NA (double);
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67 extern OCTAVE_API int lo_ieee_is_NaN_or_NA (double) GCC_ATTR_DEPRECATED;
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68
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69 extern OCTAVE_API double lo_ieee_inf_value (void);
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70 extern OCTAVE_API double lo_ieee_na_value (void);
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71 extern OCTAVE_API double lo_ieee_nan_value (void);
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72
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73 extern OCTAVE_API int lo_ieee_signbit (double);
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75 #ifdef __cplusplus
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76 }
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77 #endif
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78
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79 #endif
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80
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81 /*
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82 ;;; Local Variables: ***
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83 ;;; mode: C++ ***
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84 ;;; End: ***
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85 */