Move Source/WTF/wtf to Source/wtf

Source/WTF/wtf/DoublyLinkedList.h

-/*
- * Copyright (C) 2011 Apple Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
- * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
- * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
- * THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef DoublyLinkedList_h
-#define DoublyLinkedList_h
-
-namespace WTF {
-
-// This class allows nodes to share code without dictating data member layout.
-template<typename T> class DoublyLinkedListNode {
-public:
-    DoublyLinkedListNode();
-    
-    void setPrev(T*);
-    void setNext(T*);
-    
-    T* prev() const;
-    T* next() const;
-};
-
-template<typename T> inline DoublyLinkedListNode<T>::DoublyLinkedListNode()
-{
-    setPrev(0);
-    setNext(0);
-}
-
-template<typename T> inline void DoublyLinkedListNode<T>::setPrev(T* prev)
-{
-    static_cast<T*>(this)->m_prev = prev;
-}
-
-template<typename T> inline void DoublyLinkedListNode<T>::setNext(T* next)
-{
-    static_cast<T*>(this)->m_next = next;
-}
-
-template<typename T> inline T* DoublyLinkedListNode<T>::prev() const
-{
-    return static_cast<const T*>(this)->m_prev;
-}
-
-template<typename T> inline T* DoublyLinkedListNode<T>::next() const
-{
-    return static_cast<const T*>(this)->m_next;
-}
-
-template<typename T> class DoublyLinkedList {
-public:
-    DoublyLinkedList();
-    
-    bool isEmpty() const;
-    size_t size() const; // This is O(n).
-    void clear();
-
-    T* head() const;
-    T* removeHead();
-
-    T* tail() const;
-
-    void push(T*);
-    void append(T*);
-    void remove(T*);
-
-private:
-    T* m_head;
-    T* m_tail;
-};
-
-template<typename T> inline DoublyLinkedList<T>::DoublyLinkedList()
-    : m_head(0)
-    , m_tail(0)
-{
-}
-
-template<typename T> inline bool DoublyLinkedList<T>::isEmpty() const
-{
-    return !m_head;
-}
-
-template<typename T> inline size_t DoublyLinkedList<T>::size() const
-{
-    size_t size = 0;
-    for (T* node = m_head; node; node = node->next())
-        ++size;
-    return size;
-}
-
-template<typename T> inline void DoublyLinkedList<T>::clear()
-{
-    m_head = 0;
-    m_tail = 0;
-}
-
-template<typename T> inline T* DoublyLinkedList<T>::head() const
-{
-    return m_head;
-}
-
-template<typename T> inline T* DoublyLinkedList<T>::tail() const
-{
-    return m_tail;
-}
-
-template<typename T> inline void DoublyLinkedList<T>::push(T* node)
-{
-    if (!m_head) {
-        ASSERT(!m_tail);
-        m_head = node;
-        m_tail = node;
-        node->setPrev(0);
-        node->setNext(0);
-        return;
-    }
-
-    ASSERT(m_tail);
-    m_head->setPrev(node);
-    node->setNext(m_head);
-    node->setPrev(0);
-    m_head = node;
-}
-
-template<typename T> inline void DoublyLinkedList<T>::append(T* node)
-{
-    if (!m_tail) {
-        ASSERT(!m_head);
-        m_head = node;
-        m_tail = node;
-        node->setPrev(0);
-        node->setNext(0);
-        return;
-    }
-
-    ASSERT(m_head);
-    m_tail->setNext(node);
-    node->setPrev(m_tail);
-    node->setNext(0);
-    m_tail = node;
-}
-
-template<typename T> inline void DoublyLinkedList<T>::remove(T* node)
-{
-    if (node->prev()) {
-        ASSERT(node != m_head);
-        node->prev()->setNext(node->next());
-    } else {
-        ASSERT(node == m_head);
-        m_head = node->next();
-    }
-
-    if (node->next()) {
-        ASSERT(node != m_tail);
-        node->next()->setPrev(node->prev());
-    } else {
-        ASSERT(node == m_tail);
-        m_tail = node->prev();
-    }
-}
-
-template<typename T> inline T* DoublyLinkedList<T>::removeHead()
-{
-    T* node = head();
-    if (node)
-        remove(node);
-    return node;
-}
-
-} // namespace WTF
-
-using WTF::DoublyLinkedListNode;
-using WTF::DoublyLinkedList;
-
-#endif