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LibreOffice 6.2 SDK C/C++ API Reference
mathconf.h
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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19 
20 #ifndef INCLUDED_SAL_MATHCONF_H
21 #define INCLUDED_SAL_MATHCONF_H
22 
23 #include "osl/endian.h"
24 
25 #if defined __sun
26 #include <ieeefp.h>
27 #endif /* __sun */
28 
29 #if defined(__cplusplus) && ( defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L )
30 #include <cmath>
31 #endif
32 
33 #if defined(IOS)
34 #if defined(__cplusplus)
35 #include <cmath>
36 #else
37 #include <math.h>
38 #endif
39 #endif
40 
41 #if defined __cplusplus
42 extern "C" {
43 #endif /* __cplusplus */
44 
45 
46 /* Generally, the C standard guarantees that at program startup, "trapping or
47  stopping (if supported) is disabled on all [floating-point] exceptions"
48  (F.7.3/1 of the August 3, 1998 draft of C99), and that during program
49  execution, "a programmer can safely assume default modes (or be unaware of
50  them)" (7.6/2, footnote 161 of the August 3, 1998 draft of C99). Reportedly,
51  on Windows there are printer drivers that switch on exceptions. To avoid
52  problems, the SAL_MATH_FPEXCEPTIONS_OFF macro can be used to explicitly
53  switch off exceptions (on Windows).
54  */
55 #if defined(_WIN32)
56 #define SAL_MATH_FPEXCEPTIONS_OFF() _control87( _MCW_EM, _MCW_EM )
57 #else /* WNT */
58 #define SAL_MATH_FPEXCEPTIONS_OFF()
59 #endif /* WNT */
60 
61 
62 /* SAL_MATH_FINITE(d): test double d on INFINITY, NaN et al. */
63 #if !defined __sun && !defined ANDROID \
64  && defined(__cplusplus) \
65  && ( defined(__GXX_EXPERIMENTAL_CXX0X__) \
66  || __cplusplus >= 201103L \
67  || defined(IOS) )
68 #define SAL_MATH_FINITE(d) std::isfinite(d)
69 #elif defined( IOS )
70 #define SAL_MATH_FINITE(d) isfinite(d)
71 #elif defined( WNT)
72 #define SAL_MATH_FINITE(d) _finite(d)
73 #elif defined(ANDROID) || defined LINUX || defined UNX
74 #define SAL_MATH_FINITE(d) finite(d)
75 #else /* WNT, LINUX, UNX */
76 #error "SAL_MATH_FINITE not defined"
77 #endif /* WNT, LINUX, UNX */
78 
79 
80 /* This needs to be fixed for non--IEEE-754 platforms: */
81 #if 1 /* IEEE 754 supported */
82 #if defined OSL_BIGENDIAN
83 
84 /* IEEE 754 double structures for BigEndian */
85 union sal_math_Double
86 {
87  struct
88  {
89  unsigned sign : 1;
90  unsigned exponent :11;
91  unsigned fraction_hi :20;
92  unsigned fraction_lo :32;
93  } inf_parts;
94  struct
95  {
96  unsigned sign : 1;
97  unsigned exponent :11;
98  unsigned qnan_bit : 1;
99  unsigned bits :19;
100  unsigned fraction_lo :32;
101  } nan_parts;
102  struct
103  {
104  unsigned msw :32;
105  unsigned lsw :32;
106  } w32_parts;
107  double value;
108 };
109 
110 #elif defined OSL_LITENDIAN
111 
112 /* IEEE 754 double structures for LittleEndian */
113 union sal_math_Double
114 {
115  struct {
116  unsigned fraction_lo :32;
117  unsigned fraction_hi :20;
118  unsigned exponent :11;
119  unsigned sign : 1;
120  } inf_parts;
121  struct {
122  unsigned fraction_lo :32;
123  unsigned bits :19;
124  unsigned qnan_bit : 1;
125  unsigned exponent :11;
126  unsigned sign : 1;
127  } nan_parts;
128  struct
129  {
130  unsigned lsw :32;
131  unsigned msw :32;
132  } w32_parts;
133  double value;
134 };
135 
136 #else /* OSL_BIGENDIAN, OSL_LITENDIAN */
137 
138 #error "neither OSL_BIGENDIAN nor OSL_LITENDIAN"
139 
140 #endif /* OSL_BIGENDIAN, OSL_LITENDIAN */
141 #else /* IEEE 754 supported */
142 
143 #error "don't know how to handle IEEE 754"
144 
145 #endif /* IEEE 754 supported */
146 
147 
148 #if defined __cplusplus
149 }
150 #endif /* __cplusplus */
151 
152 #endif /* INCLUDED_SAL_MATHCONF_H */
153 
154 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */