qlinkedlist.h
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上传日期:2022-06-22
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- /****************************************************************************
- **
- ** Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
- ** Contact: Qt Software Information (qt-info@nokia.com)
- **
- ** This file is part of the QtCore module of the Qt Toolkit.
- **
- ** Commercial Usage
- ** Licensees holding valid Qt Commercial licenses may use this file in
- ** accordance with the Qt Commercial License Agreement provided with the
- ** Software or, alternatively, in accordance with the terms contained in
- ** a written agreement between you and Nokia.
- **
- **
- ** GNU General Public License Usage
- ** Alternatively, this file may be used under the terms of the GNU
- ** General Public License versions 2.0 or 3.0 as published by the Free
- ** Software Foundation and appearing in the file LICENSE.GPL included in
- ** the packaging of this file. Please review the following information
- ** to ensure GNU General Public Licensing requirements will be met:
- ** http://www.fsf.org/licensing/licenses/info/GPLv2.html and
- ** http://www.gnu.org/copyleft/gpl.html. In addition, as a special
- ** exception, Nokia gives you certain additional rights. These rights
- ** are described in the Nokia Qt GPL Exception version 1.3, included in
- ** the file GPL_EXCEPTION.txt in this package.
- **
- ** Qt for Windows(R) Licensees
- ** As a special exception, Nokia, as the sole copyright holder for Qt
- ** Designer, grants users of the Qt/Eclipse Integration plug-in the
- ** right for the Qt/Eclipse Integration to link to functionality
- ** provided by Qt Designer and its related libraries.
- **
- ** If you are unsure which license is appropriate for your use, please
- ** contact the sales department at qt-sales@nokia.com.
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- ****************************************************************************/
- #ifndef QLINKEDLIST_H
- #define QLINKEDLIST_H
- #include <QtCore/qiterator.h>
- #include <QtCore/qatomic.h>
- #ifndef QT_NO_STL
- #include <iterator>
- #include <list>
- #endif
- QT_BEGIN_HEADER
- QT_BEGIN_NAMESPACE
- QT_MODULE(Core)
- struct Q_CORE_EXPORT QLinkedListData
- {
- QLinkedListData *n, *p;
- QBasicAtomicInt ref;
- int size;
- uint sharable : 1;
- static QLinkedListData shared_null;
- };
- template <typename T>
- struct QLinkedListNode
- {
- inline QLinkedListNode(const T &arg): t(arg) { }
- QLinkedListNode *n, *p;
- T t;
- };
- template <class T>
- class QLinkedList
- {
- typedef QLinkedListNode<T> Node;
- union { QLinkedListData *d; QLinkedListNode<T> *e; };
- public:
- inline QLinkedList() : d(&QLinkedListData::shared_null) { d->ref.ref(); }
- inline QLinkedList(const QLinkedList<T> &l) : d(l.d) { d->ref.ref(); if (!d->sharable) detach(); }
- ~QLinkedList();
- QLinkedList<T> &operator=(const QLinkedList<T> &);
- bool operator==(const QLinkedList<T> &l) const;
- inline bool operator!=(const QLinkedList<T> &l) const { return !(*this == l); }
- inline int size() const { return d->size; }
- inline void detach()
- { if (d->ref != 1) detach_helper(); }
- inline bool isDetached() const { return d->ref == 1; }
- inline void setSharable(bool sharable) { if (!sharable) detach(); d->sharable = sharable; }
- inline bool isEmpty() const { return d->size == 0; }
- void clear();
- void append(const T &);
- void prepend(const T &);
- T takeFirst();
- T takeLast();
- int removeAll(const T &t);
- bool removeOne(const T &t);
- bool contains(const T &t) const;
- int count(const T &t) const;
- class const_iterator;
- class iterator
- {
- public:
- typedef std::bidirectional_iterator_tag iterator_category;
- typedef ptrdiff_t difference_type;
- typedef T value_type;
- typedef T *pointer;
- typedef T &reference;
- Node *i;
- inline iterator() : i(0) {}
- inline iterator(Node *n) : i(n) {}
- inline iterator(const iterator &o) : i(o.i) {}
- inline iterator &operator=(const iterator &o) { i = o.i; return *this; }
- inline T &operator*() const { return i->t; }
- inline T *operator->() const { return &i->t; }
- inline bool operator==(const iterator &o) const { return i == o.i; }
- inline bool operator!=(const iterator &o) const { return i != o.i; }
- inline bool operator==(const const_iterator &o) const
- { return i == o.i; }
- inline bool operator!=(const const_iterator &o) const
- { return i != o.i; }
- inline iterator &operator++() { i = i->n; return *this; }
- inline iterator operator++(int) { Node *n = i; i = i->n; return n; }
- inline iterator &operator--() { i = i->p; return *this; }
- inline iterator operator--(int) { Node *n = i; i = i->p; return n; }
- inline iterator operator+(int j) const
- { Node *n = i; if (j > 0) while (j--) n = n->n; else while (j++) n = n->p; return n; }
- inline iterator operator-(int j) const { return operator+(-j); }
- inline iterator &operator+=(int j) { return *this = *this + j; }
- inline iterator &operator-=(int j) { return *this = *this - j; }
- };
- friend class iterator;
- class const_iterator
- {
- public:
- typedef std::bidirectional_iterator_tag iterator_category;
- typedef ptrdiff_t difference_type;
- typedef T value_type;
- typedef const T *pointer;
- typedef const T &reference;
- Node *i;
- inline const_iterator() : i(0) {}
- inline const_iterator(Node *n) : i(n) {}
- inline const_iterator(const const_iterator &o) : i(o.i){}
- inline const_iterator(iterator ci) : i(ci.i){}
- inline const_iterator &operator=(const const_iterator &o) { i = o.i; return *this; }
- inline const T &operator*() const { return i->t; }
- inline const T *operator->() const { return &i->t; }
- inline bool operator==(const const_iterator &o) const { return i == o.i; }
- inline bool operator!=(const const_iterator &o) const { return i != o.i; }
- inline const_iterator &operator++() { i = i->n; return *this; }
- inline const_iterator operator++(int) { Node *n = i; i = i->n; return n; }
- inline const_iterator &operator--() { i = i->p; return *this; }
- inline const_iterator operator--(int) { Node *n = i; i = i->p; return n; }
- inline const_iterator operator+(int j) const
- { Node *n = i; if (j > 0) while (j--) n = n->n; else while (j++) n = n->p; return n; }
- inline const_iterator operator-(int j) const { return operator+(-j); }
- inline const_iterator &operator+=(int j) { return *this = *this + j; }
- inline const_iterator &operator-=(int j) { return *this = *this - j; }
- };
- friend class const_iterator;
- // stl style
- inline iterator begin() { detach(); return e->n; }
- inline const_iterator begin() const { return e->n; }
- inline const_iterator constBegin() const { return e->n; }
- inline iterator end() { detach(); return e; }
- inline const_iterator end() const { return e; }
- inline const_iterator constEnd() const { return e; }
- iterator insert(iterator before, const T &t);
- iterator erase(iterator pos);
- iterator erase(iterator first, iterator last);
- // more Qt
- typedef iterator Iterator;
- typedef const_iterator ConstIterator;
- inline int count() const { return d->size; }
- inline T& first() { Q_ASSERT(!isEmpty()); return *begin(); }
- inline const T& first() const { Q_ASSERT(!isEmpty()); return *begin(); }
- T& last() { Q_ASSERT(!isEmpty()); return *(--end()); }
- const T& last() const { Q_ASSERT(!isEmpty()); return *(--end()); }
- inline void removeFirst() { Q_ASSERT(!isEmpty()); erase(begin()); }
- inline void removeLast() { Q_ASSERT(!isEmpty()); erase(--end()); }
- // stl compatibility
- inline void push_back(const T &t) { append(t); }
- inline void push_front(const T &t) { prepend(t); }
- inline T& front() { return first(); }
- inline const T& front() const { return first(); }
- inline T& back() { return last(); }
- inline const T& back() const { return last(); }
- inline void pop_front() { removeFirst(); }
- inline void pop_back() { removeLast(); }
- inline bool empty() const { return isEmpty(); }
- typedef int size_type;
- typedef T value_type;
- typedef value_type *pointer;
- typedef const value_type *const_pointer;
- typedef value_type &reference;
- typedef const value_type &const_reference;
- typedef ptrdiff_t difference_type;
- #ifndef QT_NO_STL
- static inline QLinkedList<T> fromStdList(const std::list<T> &list)
- { QLinkedList<T> tmp; qCopy(list.begin(), list.end(), std::back_inserter(tmp)); return tmp; }
- inline std::list<T> toStdList() const
- { std::list<T> tmp; qCopy(constBegin(), constEnd(), std::back_inserter(tmp)); return tmp; }
- #endif
- #ifdef QT3_SUPPORT
- // compatibility
- inline QT3_SUPPORT iterator remove(iterator pos) { return erase(pos); }
- inline QT3_SUPPORT int findIndex(const T& t) const
- { int i=0; for (const_iterator it = begin(); it != end(); ++it, ++i) if(*it == t) return i; return -1;}
- inline QT3_SUPPORT iterator find(iterator from, const T& t)
- { while (from != end() && !(*from == t)) ++from; return from; }
- inline QT3_SUPPORT iterator find(const T& t)
- { return find(begin(), t); }
- inline QT3_SUPPORT const_iterator find(const_iterator from, const T& t) const
- { while (from != end() && !(*from == t)) ++from; return from; }
- inline QT3_SUPPORT const_iterator find(const T& t) const
- { return find(begin(), t); }
- #endif
- // comfort
- QLinkedList<T> &operator+=(const QLinkedList<T> &l);
- QLinkedList<T> operator+(const QLinkedList<T> &l) const;
- inline QLinkedList<T> &operator+=(const T &t) { append(t); return *this; }
- inline QLinkedList<T> &operator<< (const T &t) { append(t); return *this; }
- inline QLinkedList<T> &operator<<(const QLinkedList<T> &l) { *this += l; return *this; }
- private:
- void detach_helper();
- void free(QLinkedListData*);
- };
- template <typename T>
- inline QLinkedList<T>::~QLinkedList()
- {
- if (!d)
- return;
- if (!d->ref.deref())
- free(d);
- }
- template <typename T>
- void QLinkedList<T>::detach_helper()
- {
- union { QLinkedListData *d; Node *e; } x;
- x.d = new QLinkedListData;
- x.d->ref = 1;
- x.d->size = d->size;
- x.d->sharable = true;
- Node *i = e->n, *j = x.e;
- while (i != e) {
- j->n = new Node(i->t);
- j->n->p = j;
- i = i->n;
- j = j->n;
- }
- j->n = x.e;
- x.e->p = j;
- if (!d->ref.deref())
- free(d);
- d = x.d;
- }
- template <typename T>
- void QLinkedList<T>::free(QLinkedListData *x)
- {
- Node *y = reinterpret_cast<Node*>(x);
- Node *i = y->n;
- if (x->ref == 0) {
- while(i != y) {
- Node *n = i;
- i = i->n;
- delete n;
- }
- delete x;
- }
- }
- template <typename T>
- void QLinkedList<T>::clear()
- {
- *this = QLinkedList<T>();
- }
- template <typename T>
- QLinkedList<T> &QLinkedList<T>::operator=(const QLinkedList<T> &l)
- {
- if (d != l.d) {
- l.d->ref.ref();
- if (!d->ref.deref())
- free(d);
- d = l.d;
- if (!d->sharable)
- detach_helper();
- }
- return *this;
- }
- template <typename T>
- bool QLinkedList<T>::operator== (const QLinkedList<T> &l) const
- {
- if (d->size != l.d->size)
- return false;
- if (e == l.e)
- return true;
- Node *i = e->n;
- Node *il = l.e->n;
- while (i != e) {
- if (! (i->t == il->t))
- return false;
- i = i->n;
- il = il->n;
- }
- return true;
- }
- template <typename T>
- void QLinkedList<T>::append(const T &t)
- {
- detach();
- Node *i = new Node(t);
- i->n = e;
- i->p = e->p;
- i->p->n = i;
- e->p = i;
- d->size++;
- }
- template <typename T>
- void QLinkedList<T>::prepend(const T &t)
- {
- detach();
- Node *i = new Node(t);
- i->n = e->n;
- i->p = e;
- i->n->p = i;
- e->n = i;
- d->size++;
- }
- template <typename T>
- int QLinkedList<T>::removeAll(const T &_t)
- {
- detach();
- const T t = _t;
- Node *i = e->n;
- int c = 0;
- while (i != e) {
- if (i->t == t) {
- Node *n = i;
- i->n->p = i->p;
- i->p->n = i->n;
- i = i->n;
- delete n;
- c++;
- } else {
- i = i->n;
- }
- }
- d->size-=c;
- return c;
- }
- template <typename T>
- bool QLinkedList<T>::removeOne(const T &_t)
- {
- detach();
- iterator it = qFind(begin(), end(), _t);
- if (it != end()) {
- erase(it);
- return true;
- }
- return false;
- }
- template <typename T>
- inline T QLinkedList<T>::takeFirst()
- {
- T t = first();
- removeFirst();
- return t;
- }
- template <typename T>
- inline T QLinkedList<T>::takeLast()
- {
- T t = last();
- removeLast();
- return t;
- }
- template <typename T>
- bool QLinkedList<T>::contains(const T &t) const
- {
- Node *i = e;
- while ((i = i->n) != e)
- if (i->t == t)
- return true;
- return false;
- }
- template <typename T>
- int QLinkedList<T>::count(const T &t) const
- {
- Node *i = e;
- int c = 0;
- while ((i = i->n) != e)
- if (i->t == t)
- c++;
- return c;
- }
- template <typename T>
- typename QLinkedList<T>::iterator QLinkedList<T>::insert(iterator before, const T &t)
- {
- Node *i = before.i;
- Node *m = new Node(t);
- m->n = i;
- m->p = i->p;
- m->p->n = m;
- i->p = m;
- d->size++;
- return m;
- }
- template <typename T>
- typename QLinkedList<T>::iterator QLinkedList<T>::erase(typename QLinkedList<T>::iterator afirst,
- typename QLinkedList<T>::iterator alast)
- {
- while (afirst != alast)
- erase(afirst++);
- return alast;
- }
- template <typename T>
- typename QLinkedList<T>::iterator QLinkedList<T>::erase(iterator pos)
- {
- detach();
- Node *i = pos.i;
- if (i != e) {
- Node *n = i;
- i->n->p = i->p;
- i->p->n = i->n;
- i = i->n;
- delete n;
- d->size--;
- }
- return i;
- }
- template <typename T>
- QLinkedList<T> &QLinkedList<T>::operator+=(const QLinkedList<T> &l)
- {
- detach();
- int n = l.d->size;
- d->size += n;
- Node *o = l.e->n;
- while (n--) {
- Node *i = new Node(o->t);
- o = o->n;
- i->n = e;
- i->p = e->p;
- i->p->n = i;
- e->p = i;
- }
- return *this;
- }
- template <typename T>
- QLinkedList<T> QLinkedList<T>::operator+(const QLinkedList<T> &l) const
- {
- QLinkedList<T> n = *this;
- n += l;
- return n;
- }
- Q_DECLARE_SEQUENTIAL_ITERATOR(LinkedList)
- Q_DECLARE_MUTABLE_SEQUENTIAL_ITERATOR(LinkedList)
- QT_END_NAMESPACE
- QT_END_HEADER
- #endif // QLINKEDLIST_H