38be0d1383
This is the beginning of revision history for this module. If you want to look at revision history older than this, please refer to the Qt Git wiki for how to use Git history grafting. At the time of writing, this wiki is located here: http://qt.gitorious.org/qt/pages/GitIntroductionWithQt If you have already performed the grafting and you don't see any history beyond this commit, try running "git log" with the "--follow" argument. Branched from the monolithic repo, Qt master branch, at commit 896db169ea224deb96c59ce8af800d019de63f12
146 lines
4.4 KiB
C
146 lines
4.4 KiB
C
/****************************************************************************
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**
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** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the test suite of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef QNUM_H
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#define QNUM_H
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//
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// W A R N I N G
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// -------------
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//
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// This file is not part of the Qt API. It exists purely as an
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// implementation detail. This header file may change from version to
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// version without notice, or even be removed.
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//
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// We mean it.
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//
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#include "QtCore/qglobal.h"
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static const unsigned char qt_be_inf_bytes[] = { 0x7f, 0xf0, 0, 0, 0, 0, 0, 0 };
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static const unsigned char qt_le_inf_bytes[] = { 0, 0, 0, 0, 0, 0, 0xf0, 0x7f };
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static inline double qtInf()
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{
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return *reinterpret_cast<const double *>(QSysInfo::ByteOrder == QSysInfo::BigEndian ? qt_be_inf_bytes : qt_le_inf_bytes);
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}
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#define Q_INFINITY (::qtInf())
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// Signaling NAN
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static const unsigned char qt_be_snan_bytes[] = { 0x7f, 0xf8, 0, 0, 0, 0, 0, 0 };
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static const unsigned char qt_le_snan_bytes[] = { 0, 0, 0, 0, 0, 0, 0xf8, 0x7f };
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static inline double qtSnan()
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{
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return *reinterpret_cast<const double *>(QSysInfo::ByteOrder == QSysInfo::BigEndian ? qt_be_snan_bytes : qt_le_snan_bytes);
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}
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#define Q_SNAN (::qtSnan())
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// Quiet NAN
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static const unsigned char qt_be_qnan_bytes[] = { 0xff, 0xf8, 0, 0, 0, 0, 0, 0 };
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static const unsigned char qt_le_qnan_bytes[] = { 0, 0, 0, 0, 0, 0, 0xf8, 0xff };
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static inline double qtQnan()
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{
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return *reinterpret_cast<const double *>(QSysInfo::ByteOrder == QSysInfo::BigEndian ? qt_be_qnan_bytes : qt_le_qnan_bytes);
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}
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#define Q_QNAN (::qtQnan())
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static inline bool qIsInf(double d)
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{
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uchar *ch = (uchar *)&d;
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if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
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return (ch[0] & 0x7f) == 0x7f && ch[1] == 0xf0;
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} else {
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return (ch[7] & 0x7f) == 0x7f && ch[6] == 0xf0;
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}
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}
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static inline bool qIsNaN(double d)
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{
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uchar *ch = (uchar *)&d;
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if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
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return (ch[0] & 0x7f) == 0x7f && ch[1] > 0xf0;
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} else {
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return (ch[7] & 0x7f) == 0x7f && ch[6] > 0xf0;
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}
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}
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static inline bool qIsFinite(double d)
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{
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uchar *ch = (uchar *)&d;
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if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
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return (ch[0] & 0x7f) != 0x7f || (ch[1] & 0xf0) != 0xf0;
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} else {
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return (ch[7] & 0x7f) != 0x7f || (ch[6] & 0xf0) != 0xf0;
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}
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}
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static inline bool qIsInf(float d)
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{
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uchar *ch = (uchar *)&d;
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if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
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return (ch[0] & 0x7f) == 0x7f && ch[1] == 0x80;
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} else {
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return (ch[3] & 0x7f) == 0x7f && ch[2] == 0x80;
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}
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}
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static inline bool qIsNaN(float d)
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{
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uchar *ch = (uchar *)&d;
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if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
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return (ch[0] & 0x7f) == 0x7f && ch[1] > 0x80;
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} else {
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return (ch[3] & 0x7f) == 0x7f && ch[2] > 0x80;
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}
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}
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static inline bool qIsFinite(float d)
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{
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uchar *ch = (uchar *)&d;
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if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
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return (ch[0] & 0x7f) != 0x7f || (ch[1] & 0x80) != 0x80;
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} else {
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return (ch[3] & 0x7f) != 0x7f || (ch[2] & 0x80) != 0x80;
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}
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}
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#endif // QNUMERIC_P_H
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