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annotate liboctave/lo-ieee.h @ 7016:93c65f2a5668

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[project @ 2007-10-12 06:40:56 by jwe]
author jwe
date Fri, 12 Oct 2007 06:41:26 +0000
parents 143b556ce725
children a1dbe9d80eee
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1 /*
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2
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3 Copyright (C) 1996, 1997 John W. Eaton
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4
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5 This file is part of Octave.
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6
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7 Octave is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 3 of the License, or (at your
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10 option) any later version.
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11
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12 Octave is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with Octave; see the file COPYING. If not, see
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19 <http://www.gnu.org/licenses/>.
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20
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21 */
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22
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23 #if !defined (octave_liboctave_ieee_h)
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24 #define octave_liboctave_ieee_h 1
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25
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26 #ifdef __cplusplus
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27 extern "C" {
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28 #endif
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29
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30 /* Octave's idea of infinity. */
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31 extern OCTAVE_API double octave_Inf;
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32
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33 /* Octave's idea of a missing value. */
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34 extern OCTAVE_API double octave_NA;
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35
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36 /* Octave's idea of not a number. */
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37 extern OCTAVE_API double octave_NaN;
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38
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39 /* FIXME -- this code assumes that a double has twice the
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40 number of bits as an int */
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41
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42 extern OCTAVE_API int lo_ieee_hw;
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43 extern OCTAVE_API int lo_ieee_lw;
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44
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45 typedef union
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46 {
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47 double value;
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48 unsigned int word[2];
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49 } lo_ieee_double;
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50
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51 #define LO_IEEE_NA_HW 0x7ff00000
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52 #define LO_IEEE_NA_LW 1954
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53
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54 extern OCTAVE_API void octave_ieee_init (void);
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55
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56 #if defined (SCO)
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57 extern int isnan (double);
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58 extern int isinf (double);
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59 #endif
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60
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61 extern OCTAVE_API int lo_ieee_isnan (double x);
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62 extern OCTAVE_API int lo_ieee_finite (double x);
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63 extern OCTAVE_API int lo_ieee_isinf (double x);
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64
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65 extern OCTAVE_API int lo_ieee_is_NA (double);
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66 extern OCTAVE_API int lo_ieee_is_NaN_or_NA (double) GCC_ATTR_DEPRECATED;
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67
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68 extern OCTAVE_API double lo_ieee_inf_value (void);
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69 extern OCTAVE_API double lo_ieee_na_value (void);
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70 extern OCTAVE_API double lo_ieee_nan_value (void);
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71
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72 extern OCTAVE_API int lo_ieee_signbit (double);
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74 #ifdef __cplusplus
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75 }
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76 #endif
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77
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78 #endif
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79
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80 /*
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81 ;;; Local Variables: ***
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82 ;;; mode: C++ ***
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83 ;;; End: ***
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84 */