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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the test suite of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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 1.1, 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.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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
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