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2f5dd8d56b
these should be guarded by QT_NO_STD and are probably not going to work on all platforms, Qt5 does a lot of magic for this Signed-off-by: Ivailo Monev <xakepa10@gmail.com>
154 lines
4.6 KiB
C++
154 lines
4.6 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://www.qt.io/licensing/
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**
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** This file is part of the QtCore module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see http://www.qt.io/terms-conditions. For further
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** information use the contact form at http://www.qt.io/contact-us.
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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 or version 3 as published by the Free
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** Software Foundation and appearing in the file LICENSE.LGPLv21 and
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** LICENSE.LGPLv3 included in the packaging of this file. Please review the
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** following information to ensure the GNU Lesser General Public License
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** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** As a special exception, The Qt Company gives you certain additional
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** rights. These rights are described in The Qt Company 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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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "qnumeric.h"
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#include "qnumeric_p.h"
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QT_BEGIN_NAMESPACE
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#ifdef QT_NO_STL
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/*!
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Returns true if the double \a {d} is equivalent to infinity.
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*/
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Q_CORE_EXPORT bool qIsInf(double d)
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{
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uchar *ch = (uchar *)&d;
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#ifdef QT_ARMFPA
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return (ch[3] & 0x7f) == 0x7f && ch[2] == 0xf0;
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#else
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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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#endif
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}
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/*!
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Returns true if the double \a {d} is not a number (NaN).
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*/
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Q_CORE_EXPORT bool qIsNaN(double d)
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{
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uchar *ch = (uchar *)&d;
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#ifdef QT_ARMFPA
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return (ch[3] & 0x7f) == 0x7f && ch[2] > 0xf0;
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#else
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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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#endif
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}
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/*!
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Returns true if the double \a {d} is a finite number.
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*/
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Q_CORE_EXPORT bool qIsFinite(double d)
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{
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uchar *ch = (uchar *)&d;
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#ifdef QT_ARMFPA
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return (ch[3] & 0x7f) != 0x7f || (ch[2] & 0xf0) != 0xf0;
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#else
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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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#endif
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}
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/*!
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Returns true if the float \a {f} is equivalent to infinity.
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*/
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Q_CORE_EXPORT bool qIsInf(float f)
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{
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uchar *ch = (uchar *)&f;
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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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/*!
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Returns true if the float \a {f} is not a number (NaN).
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*/
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Q_CORE_EXPORT bool qIsNaN(float f)
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{
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uchar *ch = (uchar *)&f;
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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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/*!
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Returns true if the float \a {f} is a finite number.
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*/
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Q_CORE_EXPORT bool qIsFinite(float f)
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{
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uchar *ch = (uchar *)&f;
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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 // QT_NO_STL
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/*!
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Returns the bit pattern of a signalling NaN as a double.
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*/
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Q_CORE_EXPORT double qSNaN() { return qt_snan(); }
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/*!
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Returns the bit pattern of a quiet NaN as a double.
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*/
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Q_CORE_EXPORT double qQNaN() { return qt_qnan(); }
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/*!
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Returns the bit pattern for an infinite number as a double.
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*/
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Q_CORE_EXPORT double qInf() { return qt_inf(); }
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QT_END_NAMESPACE
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