242 lines
7.6 KiB
C++
242 lines
7.6 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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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 QARRAYDATAPOINTER_H
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#define QARRAYDATAPOINTER_H
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#include <QtCore/qarraydataops.h>
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#include <QtCore/qcontainertools_impl.h>
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QT_BEGIN_NAMESPACE
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template <class T>
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struct QArrayDataPointer
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{
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private:
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typedef QTypedArrayData<T> Data;
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typedef QArrayDataOps<T> DataOps;
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public:
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typedef typename Data::iterator iterator;
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typedef typename Data::const_iterator const_iterator;
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QArrayDataPointer() noexcept
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: d(Data::sharedNull()), ptr(Data::sharedNullData()), size(0)
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{
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}
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QArrayDataPointer(const QArrayDataPointer &other) noexcept
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: d(other.d), ptr(other.ptr), size(other.size)
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{
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other.d->ref();
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}
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QArrayDataPointer(Data *header, T *adata, size_t n = 0) noexcept
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: d(header), ptr(adata), size(n)
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{
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}
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explicit QArrayDataPointer(QPair<QTypedArrayData<T> *, T *> adata, size_t n = 0)
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: d(adata.first), ptr(adata.second), size(n)
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{
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Q_CHECK_PTR(d);
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}
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QArrayDataPointer(QArrayDataPointerRef<T> dd) noexcept
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: d(dd.ptr), ptr(dd.data), size(dd.size)
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{
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}
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QArrayDataPointer &operator=(const QArrayDataPointer &other) noexcept
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{
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QArrayDataPointer tmp(other);
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this->swap(tmp);
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return *this;
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}
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QArrayDataPointer(QArrayDataPointer &&other) noexcept
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: d(other.d), ptr(other.ptr), size(other.size)
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{
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other.d = Data::sharedNull();
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other.ptr = Data::sharedNullData();
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other.size = 0;
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}
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QArrayDataPointer &operator=(QArrayDataPointer &&other) noexcept
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{
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QArrayDataPointer moved(std::move(other));
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this->swap(moved);
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return *this;
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}
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DataOps &operator*() noexcept
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{
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Q_ASSERT(d);
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return *static_cast<DataOps *>(this);
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}
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DataOps *operator->() noexcept
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{
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Q_ASSERT(d);
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return static_cast<DataOps *>(this);
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}
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const DataOps &operator*() const noexcept
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{
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Q_ASSERT(d);
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return *static_cast<const DataOps *>(this);
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}
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const DataOps *operator->() const noexcept
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{
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Q_ASSERT(d);
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return static_cast<const DataOps *>(this);
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}
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~QArrayDataPointer()
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{
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if (!d->deref()) {
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if (d->isMutable())
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(*this)->destroyAll();
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Data::deallocate(d);
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}
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}
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bool isNull() const noexcept
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{
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return d == Data::sharedNull();
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}
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T *data() noexcept { return ptr; }
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const T *data() const noexcept { return ptr; }
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iterator begin(iterator = iterator()) noexcept { return data(); }
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iterator end(iterator = iterator()) noexcept { return data() + size; }
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const_iterator begin(const_iterator = const_iterator()) const noexcept { return data(); }
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const_iterator end(const_iterator = const_iterator()) const noexcept { return data() + size; }
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const_iterator constBegin(const_iterator = const_iterator()) const noexcept { return data(); }
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const_iterator constEnd(const_iterator = const_iterator()) const noexcept { return data() + size; }
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void swap(QArrayDataPointer &other) noexcept
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{
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qSwap(d, other.d);
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qSwap(ptr, other.ptr);
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qSwap(size, other.size);
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}
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void clear() Q_DECL_NOEXCEPT_EXPR(std::is_nothrow_destructible<T>::value)
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{
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QArrayDataPointer tmp;
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swap(tmp);
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}
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bool detach()
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{
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if (d->needsDetach()) {
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QPair<Data *, T *> copy = clone(d->detachFlags());
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QArrayDataPointer old(d, ptr, size);
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d = copy.first;
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ptr = copy.second;
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return true;
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}
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return false;
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}
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// forwards from QArrayData
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size_t allocatedCapacity() noexcept { return d->allocatedCapacity(); }
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size_t constAllocatedCapacity() const noexcept { return d->constAllocatedCapacity(); }
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int refCounterValue() const noexcept { return d->refCounterValue(); }
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bool ref() noexcept { return d->ref(); }
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bool deref() noexcept { return d->deref(); }
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bool isMutable() const noexcept { return d->isMutable(); }
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bool isStatic() const noexcept { return d->isStatic(); }
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bool isShared() const noexcept { return d->isShared(); }
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bool needsDetach() const noexcept { return d->needsDetach(); }
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size_t detachCapacity(size_t newSize) const noexcept { return d->detachCapacity(newSize); }
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typename Data::ArrayOptions &flags() noexcept { return reinterpret_cast<typename Data::ArrayOptions &>(d->flags); }
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typename Data::ArrayOptions flags() const noexcept { return typename Data::ArrayOption(d->flags); }
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typename Data::ArrayOptions detachFlags() const noexcept { return d->detachFlags(); }
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typename Data::ArrayOptions cloneFlags() const noexcept { return d->cloneFlags(); }
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private:
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Q_REQUIRED_RESULT QPair<Data *, T *> clone(QArrayData::ArrayOptions options) const
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{
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QPair<Data *, T *> pair = Data::allocate(d->detachCapacity(size),
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options);
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Q_CHECK_PTR(pair.first);
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QArrayDataPointer copy(pair.first, pair.second, 0);
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if (size)
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copy->copyAppend(begin(), end());
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pair.first = copy.d;
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copy.d = Data::sharedNull();
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return pair;
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}
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protected:
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Data *d;
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T *ptr;
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public:
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uint size;
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};
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template <class T>
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inline bool operator==(const QArrayDataPointer<T> &lhs, const QArrayDataPointer<T> &rhs) noexcept
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{
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return lhs.data() == rhs.data() && lhs.size == rhs.size;
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}
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template <class T>
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inline bool operator!=(const QArrayDataPointer<T> &lhs, const QArrayDataPointer<T> &rhs) noexcept
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{
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return lhs.data() != rhs.data() || lhs.size != rhs.size;
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}
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template <class T>
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inline void qSwap(QArrayDataPointer<T> &p1, QArrayDataPointer<T> &p2) noexcept
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{
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p1.swap(p2);
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}
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QT_END_NAMESPACE
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#endif // include guard
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