1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the test suite of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://www.qtsoftware.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QNUM_H
#define QNUM_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include "QtCore/qglobal.h"
static const unsigned char qt_be_inf_bytes[] = { 0x7f, 0xf0, 0, 0, 0, 0, 0, 0 };
static const unsigned char qt_le_inf_bytes[] = { 0, 0, 0, 0, 0, 0, 0xf0, 0x7f };
static inline double qtInf()
{
return *reinterpret_cast<const double *>(QSysInfo::ByteOrder == QSysInfo::BigEndian ? qt_be_inf_bytes : qt_le_inf_bytes);
}
#define Q_INFINITY (::qtInf())
// Signaling NAN
static const unsigned char qt_be_snan_bytes[] = { 0x7f, 0xf8, 0, 0, 0, 0, 0, 0 };
static const unsigned char qt_le_snan_bytes[] = { 0, 0, 0, 0, 0, 0, 0xf8, 0x7f };
static inline double qtSnan()
{
return *reinterpret_cast<const double *>(QSysInfo::ByteOrder == QSysInfo::BigEndian ? qt_be_snan_bytes : qt_le_snan_bytes);
}
#define Q_SNAN (::qtSnan())
// Quiet NAN
static const unsigned char qt_be_qnan_bytes[] = { 0xff, 0xf8, 0, 0, 0, 0, 0, 0 };
static const unsigned char qt_le_qnan_bytes[] = { 0, 0, 0, 0, 0, 0, 0xf8, 0xff };
static inline double qtQnan()
{
return *reinterpret_cast<const double *>(QSysInfo::ByteOrder == QSysInfo::BigEndian ? qt_be_qnan_bytes : qt_le_qnan_bytes);
}
#define Q_QNAN (::qtQnan())
static inline bool qIsInf(double d)
{
uchar *ch = (uchar *)&d;
if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
return (ch[0] & 0x7f) == 0x7f && ch[1] == 0xf0;
} else {
return (ch[7] & 0x7f) == 0x7f && ch[6] == 0xf0;
}
}
static inline bool qIsNaN(double d)
{
uchar *ch = (uchar *)&d;
if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
return (ch[0] & 0x7f) == 0x7f && ch[1] > 0xf0;
} else {
return (ch[7] & 0x7f) == 0x7f && ch[6] > 0xf0;
}
}
static inline bool qIsFinite(double d)
{
uchar *ch = (uchar *)&d;
if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
return (ch[0] & 0x7f) != 0x7f || (ch[1] & 0xf0) != 0xf0;
} else {
return (ch[7] & 0x7f) != 0x7f || (ch[6] & 0xf0) != 0xf0;
}
}
static inline bool qIsInf(float d)
{
uchar *ch = (uchar *)&d;
if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
return (ch[0] & 0x7f) == 0x7f && ch[1] == 0x80;
} else {
return (ch[3] & 0x7f) == 0x7f && ch[2] == 0x80;
}
}
static inline bool qIsNaN(float d)
{
uchar *ch = (uchar *)&d;
if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
return (ch[0] & 0x7f) == 0x7f && ch[1] > 0x80;
} else {
return (ch[3] & 0x7f) == 0x7f && ch[2] > 0x80;
}
}
static inline bool qIsFinite(float d)
{
uchar *ch = (uchar *)&d;
if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
return (ch[0] & 0x7f) != 0x7f || (ch[1] & 0x80) != 0x80;
} else {
return (ch[3] & 0x7f) != 0x7f || (ch[2] & 0x80) != 0x80;
}
}
#endif // QNUMERIC_P_H
|
