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baldurk
768e812e45
* On windows it's strongly desired to be able to compile straight out of a clean checkout or source download. This means anyone can download the source and investigate something quickly, without having to worry about the hassle of figuring out how the project downloads 3rd party dependencies, fetching them, getting them registered in the right place. * This can't be put in a submodule as git submodules don't get downloaded by default so people new to git will get confusing compilation messages, and someone downloading the source from github directly without cloning via git won't get submodules included. * It does add some extra size to a fresh download/checkout which is unfortunate, but absolutely worth the cost. Shallow checkouts still aren't unfeasibly large, and it's only a one-off cost at clone time.
321 lines
12 KiB
C++
321 lines
12 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Copyright (C) 2016 Intel Corporation.
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** Copyright (C) 2014 Keith Gardner <kreios4004@gmail.com>
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** Contact: https://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 https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://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 3 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL3 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 3 requirements
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** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
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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 2.0 or (at your option) the GNU General
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** Public license version 3 or any later version approved by the KDE Free
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** Qt Foundation. The licenses are as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-2.0.html and
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** https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef QVERSIONNUMBER_H
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#define QVERSIONNUMBER_H
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#include <QtCore/qnamespace.h>
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#include <QtCore/qstring.h>
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#include <QtCore/qvector.h>
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#include <QtCore/qmetatype.h>
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#include <QtCore/qtypeinfo.h>
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QT_BEGIN_NAMESPACE
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class QVersionNumber;
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Q_CORE_EXPORT uint qHash(const QVersionNumber &key, uint seed = 0);
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#ifndef QT_NO_DATASTREAM
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Q_CORE_EXPORT QDataStream& operator<<(QDataStream &out, const QVersionNumber &version);
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Q_CORE_EXPORT QDataStream& operator>>(QDataStream &in, QVersionNumber &version);
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#endif
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class QVersionNumber
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{
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/*
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* QVersionNumber stores small values inline, without memory allocation.
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* We do that by setting the LSB in the pointer that would otherwise hold
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* the longer form of the segments.
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* The constants below help us deal with the permutations for 32- and 64-bit,
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* little- and big-endian architectures.
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*/
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enum {
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// in little-endian, inline_segments[0] is shared with the pointer's LSB, while
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// in big-endian, it's inline_segments[7]
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InlineSegmentMarker = Q_BYTE_ORDER == Q_LITTLE_ENDIAN ? 0 : sizeof(void*) - 1,
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InlineSegmentStartIdx = !InlineSegmentMarker, // 0 for BE, 1 for LE
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InlineSegmentCount = sizeof(void*) - 1
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};
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Q_STATIC_ASSERT(InlineSegmentCount >= 3); // at least major, minor, micro
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struct SegmentStorage {
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// Note: we alias the use of dummy and inline_segments in the use of the
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// union below. This is undefined behavior in C++98, but most compilers implement
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// the C++11 behavior. The one known exception is older versions of Sun Studio.
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union {
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quintptr dummy;
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qint8 inline_segments[sizeof(void*)];
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QVector<int> *pointer_segments;
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};
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// set the InlineSegmentMarker and set length to zero
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SegmentStorage() Q_DECL_NOTHROW : dummy(1) {}
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SegmentStorage(const QVector<int> &seg)
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{
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if (dataFitsInline(seg.begin(), seg.size()))
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setInlineData(seg.begin(), seg.size());
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else
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pointer_segments = new QVector<int>(seg);
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}
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SegmentStorage(const SegmentStorage &other)
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{
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if (other.isUsingPointer())
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pointer_segments = new QVector<int>(*other.pointer_segments);
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else
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dummy = other.dummy;
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}
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SegmentStorage &operator=(const SegmentStorage &other)
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{
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if (isUsingPointer() && other.isUsingPointer()) {
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*pointer_segments = *other.pointer_segments;
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} else if (other.isUsingPointer()) {
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pointer_segments = new QVector<int>(*other.pointer_segments);
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} else {
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if (isUsingPointer())
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delete pointer_segments;
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dummy = other.dummy;
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}
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return *this;
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}
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#ifdef Q_COMPILER_RVALUE_REFS
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SegmentStorage(SegmentStorage &&other) Q_DECL_NOTHROW
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: dummy(other.dummy)
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{
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other.dummy = 1;
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}
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SegmentStorage &operator=(SegmentStorage &&other) Q_DECL_NOTHROW
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{
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qSwap(dummy, other.dummy);
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return *this;
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}
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explicit SegmentStorage(QVector<int> &&seg)
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{
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if (dataFitsInline(seg.begin(), seg.size()))
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setInlineData(seg.begin(), seg.size());
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else
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pointer_segments = new QVector<int>(std::move(seg));
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}
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#endif
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#ifdef Q_COMPILER_INITIALIZER_LISTS
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SegmentStorage(std::initializer_list<int> args)
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{
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if (dataFitsInline(args.begin(), int(args.size()))) {
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setInlineData(args.begin(), int(args.size()));
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} else {
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pointer_segments = new QVector<int>(args);
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}
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}
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#endif
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~SegmentStorage() { if (isUsingPointer()) delete pointer_segments; }
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bool isUsingPointer() const Q_DECL_NOTHROW
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{ return (inline_segments[InlineSegmentMarker] & 1) == 0; }
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int size() const Q_DECL_NOTHROW
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{ return isUsingPointer() ? pointer_segments->size() : (inline_segments[InlineSegmentMarker] >> 1); }
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void setInlineSize(int len)
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{ inline_segments[InlineSegmentMarker] = 1 + 2 * len; }
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void resize(int len)
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{
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if (isUsingPointer())
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pointer_segments->resize(len);
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else
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setInlineSize(len);
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}
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int at(int index) const
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{
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return isUsingPointer() ?
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pointer_segments->at(index) :
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inline_segments[InlineSegmentStartIdx + index];
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}
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void setSegments(int len, int maj, int min = 0, int mic = 0)
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{
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if (maj == qint8(maj) && min == qint8(min) && mic == qint8(mic)) {
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int data[] = { maj, min, mic };
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setInlineData(data, len);
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} else {
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setVector(len, maj, min, mic);
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}
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}
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private:
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static bool dataFitsInline(const int *data, int len)
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{
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if (len > InlineSegmentCount)
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return false;
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for (int i = 0; i < len; ++i)
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if (data[i] != qint8(data[i]))
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return false;
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return true;
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}
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void setInlineData(const int *data, int len)
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{
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dummy = 1 + len * 2;
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#if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
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for (int i = 0; i < len; ++i)
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dummy |= quintptr(data[i] & 0xFF) << (8 * (i + 1));
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#elif Q_BYTE_ORDER == Q_BIG_ENDIAN
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for (int i = 0; i < len; ++i)
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dummy |= quintptr(data[i] & 0xFF) << (8 * (sizeof(void *) - i - 1));
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#else
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// the code above is equivalent to:
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setInlineSize(len);
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for (int i = 0; i < len; ++i)
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inline_segments[InlineSegmentStartIdx + i] = data[i] & 0xFF;
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#endif
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}
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Q_CORE_EXPORT void setVector(int len, int maj, int min, int mic);
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} m_segments;
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public:
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inline QVersionNumber() Q_DECL_NOTHROW
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: m_segments()
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{}
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inline explicit QVersionNumber(const QVector<int> &seg)
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: m_segments(seg)
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{}
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// compiler-generated copy/move ctor/assignment operators and the destructor are ok
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#ifdef Q_COMPILER_RVALUE_REFS
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explicit QVersionNumber(QVector<int> &&seg)
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: m_segments(std::move(seg))
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{}
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#endif
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#ifdef Q_COMPILER_INITIALIZER_LISTS
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inline QVersionNumber(std::initializer_list<int> args)
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: m_segments(args)
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{}
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#endif
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inline explicit QVersionNumber(int maj)
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{ m_segments.setSegments(1, maj); }
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inline explicit QVersionNumber(int maj, int min)
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{ m_segments.setSegments(2, maj, min); }
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inline explicit QVersionNumber(int maj, int min, int mic)
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{ m_segments.setSegments(3, maj, min, mic); }
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Q_REQUIRED_RESULT inline bool isNull() const Q_DECL_NOTHROW
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{ return segmentCount() == 0; }
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Q_REQUIRED_RESULT inline bool isNormalized() const Q_DECL_NOTHROW
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{ return isNull() || segmentAt(segmentCount() - 1) != 0; }
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Q_REQUIRED_RESULT inline int majorVersion() const Q_DECL_NOTHROW
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{ return segmentAt(0); }
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Q_REQUIRED_RESULT inline int minorVersion() const Q_DECL_NOTHROW
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{ return segmentAt(1); }
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Q_REQUIRED_RESULT inline int microVersion() const Q_DECL_NOTHROW
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{ return segmentAt(2); }
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Q_REQUIRED_RESULT Q_CORE_EXPORT QVersionNumber normalized() const;
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Q_REQUIRED_RESULT Q_CORE_EXPORT QVector<int> segments() const;
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Q_REQUIRED_RESULT inline int segmentAt(int index) const Q_DECL_NOTHROW
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{ return (m_segments.size() > index) ? m_segments.at(index) : 0; }
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Q_REQUIRED_RESULT inline int segmentCount() const Q_DECL_NOTHROW
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{ return m_segments.size(); }
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Q_REQUIRED_RESULT Q_CORE_EXPORT bool isPrefixOf(const QVersionNumber &other) const Q_DECL_NOTHROW;
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Q_REQUIRED_RESULT Q_CORE_EXPORT static int compare(const QVersionNumber &v1, const QVersionNumber &v2) Q_DECL_NOTHROW;
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Q_REQUIRED_RESULT Q_CORE_EXPORT static Q_DECL_PURE_FUNCTION QVersionNumber commonPrefix(const QVersionNumber &v1, const QVersionNumber &v2);
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Q_REQUIRED_RESULT Q_CORE_EXPORT QString toString() const;
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Q_REQUIRED_RESULT Q_CORE_EXPORT static Q_DECL_PURE_FUNCTION QVersionNumber fromString(const QString &string, int *suffixIndex = Q_NULLPTR);
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private:
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#ifndef QT_NO_DATASTREAM
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friend Q_CORE_EXPORT QDataStream& operator>>(QDataStream &in, QVersionNumber &version);
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#endif
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friend Q_CORE_EXPORT uint qHash(const QVersionNumber &key, uint seed);
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};
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Q_DECLARE_TYPEINFO(QVersionNumber, Q_MOVABLE_TYPE);
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#ifndef QT_NO_DEBUG_STREAM
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Q_CORE_EXPORT QDebug operator<<(QDebug, const QVersionNumber &version);
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#endif
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Q_REQUIRED_RESULT inline bool operator> (const QVersionNumber &lhs, const QVersionNumber &rhs) Q_DECL_NOTHROW
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{ return QVersionNumber::compare(lhs, rhs) > 0; }
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Q_REQUIRED_RESULT inline bool operator>=(const QVersionNumber &lhs, const QVersionNumber &rhs) Q_DECL_NOTHROW
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{ return QVersionNumber::compare(lhs, rhs) >= 0; }
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Q_REQUIRED_RESULT inline bool operator< (const QVersionNumber &lhs, const QVersionNumber &rhs) Q_DECL_NOTHROW
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{ return QVersionNumber::compare(lhs, rhs) < 0; }
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Q_REQUIRED_RESULT inline bool operator<=(const QVersionNumber &lhs, const QVersionNumber &rhs) Q_DECL_NOTHROW
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{ return QVersionNumber::compare(lhs, rhs) <= 0; }
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Q_REQUIRED_RESULT inline bool operator==(const QVersionNumber &lhs, const QVersionNumber &rhs) Q_DECL_NOTHROW
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{ return QVersionNumber::compare(lhs, rhs) == 0; }
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Q_REQUIRED_RESULT inline bool operator!=(const QVersionNumber &lhs, const QVersionNumber &rhs) Q_DECL_NOTHROW
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{ return QVersionNumber::compare(lhs, rhs) != 0; }
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QT_END_NAMESPACE
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Q_DECLARE_METATYPE(QVersionNumber)
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#endif //QVERSIONNUMBER_H
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