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95 lines
3.5 KiB
C++
95 lines
3.5 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Copyright (C) 2016-2019 Ivailo Monev
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**
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** This file is part of the QtCore module of the Katie Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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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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QT_BEGIN_NAMESPACE
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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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static const union { unsigned char c[8]; double d; } qt_be_inf_bytes = { { 0x7f, 0xf0, 0, 0, 0, 0, 0, 0 } };
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static const union { unsigned char c[8]; double d; } qt_le_inf_bytes = { { 0, 0, 0, 0, 0, 0, 0xf0, 0x7f } };
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#ifdef QT_ARMFPA
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static const union { unsigned char c[8]; double d; } qt_armfpa_inf_bytes = { { 0, 0, 0xf0, 0x7f, 0, 0, 0, 0 } };
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#endif
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Q_CORE_EXPORT double qInf()
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{
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#ifdef QT_ARMFPA
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return qt_armfpa_inf_bytes.d;
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#else
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return (QSysInfo::ByteOrder == QSysInfo::BigEndian
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? qt_be_inf_bytes.d
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: qt_le_inf_bytes.d);
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#endif
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}
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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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static const union { unsigned char c[8]; double d; } qt_be_snan_bytes = { { 0x7f, 0xf8, 0, 0, 0, 0, 0, 0 } };
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static const union { unsigned char c[8]; double d; } qt_le_snan_bytes = { { 0, 0, 0, 0, 0, 0, 0xf8, 0x7f } };
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#ifdef QT_ARMFPA
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static const union { unsigned char c[8]; double d; } qt_armfpa_snan_bytes = { { 0, 0, 0xf8, 0x7f, 0, 0, 0, 0 } };
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#endif
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Q_CORE_EXPORT double qSNaN()
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{
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#ifdef QT_ARMFPA
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return qt_armfpa_snan_bytes.d;
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#else
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return (QSysInfo::ByteOrder == QSysInfo::BigEndian
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? qt_be_snan_bytes.d
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: qt_le_snan_bytes.d);
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#endif
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}
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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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static const union { unsigned char c[8]; double d; } qt_be_qnan_bytes = { { 0xff, 0xf8, 0, 0, 0, 0, 0, 0 } };
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static const union { unsigned char c[8]; double d; } qt_le_qnan_bytes = { { 0, 0, 0, 0, 0, 0, 0xf8, 0xff } };
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#ifdef QT_ARMFPA
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static const union { unsigned char c[8]; double d; } qt_armfpa_qnan_bytes = { { 0, 0, 0xf8, 0xff, 0, 0, 0, 0 } };
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#endif
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Q_CORE_EXPORT double qQNaN()
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{
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#ifdef QT_ARMFPA
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return qt_armfpa_qnan_bytes.d;
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#else
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return (QSysInfo::ByteOrder == QSysInfo::BigEndian
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? qt_be_qnan_bytes.d
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: qt_le_qnan_bytes.d);
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#endif
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}
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QT_END_NAMESPACE
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