JavaScriptCore-1097.3.tar.gz

[apple/javascriptcore.git] / wtf / SentinelLinkedList.h

diff --git a/wtf/SentinelLinkedList.h b/wtf/SentinelLinkedList.h
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--- a/wtf/SentinelLinkedList.h
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-/*
- * 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.
- */
-
-//    A SentinelLinkedList is a linked list with dummy head and tail sentinels,
-//    which allow for branch-less insertion and removal, and removal without a
-//    pointer to the list.
-//    
-//    Requires: Node is a concrete class with:
-//        Node(SentinelTag);
-//        void setPrev(Node*);
-//        Node* prev();
-//        void setNext(Node*);
-//        Node* next();
-
-#ifndef SentinelLinkedList_h
-#define SentinelLinkedList_h
-
-namespace WTF {
-
-enum SentinelTag { Sentinel };
-
-template <typename Node> class SentinelLinkedList {
-public:
-    typedef Node* iterator;
-
-    SentinelLinkedList();
-
-    void push(Node*);
-    static void remove(Node*);
-
-    iterator begin();
-    iterator end();
-
-private:
-    Node m_headSentinel;
-    Node m_tailSentinel;
-};
-
-template <typename Node> inline SentinelLinkedList<Node>::SentinelLinkedList()
-    : m_headSentinel(Sentinel)
-    , m_tailSentinel(Sentinel)
-{
-    m_headSentinel.setNext(&m_tailSentinel);
-    m_headSentinel.setPrev(0);
-
-    m_tailSentinel.setPrev(&m_headSentinel);
-    m_tailSentinel.setNext(0);
-}
-
-template <typename Node> inline typename SentinelLinkedList<Node>::iterator SentinelLinkedList<Node>::begin()
-{
-    return m_headSentinel.next();
-}
-
-template <typename Node> inline typename SentinelLinkedList<Node>::iterator SentinelLinkedList<Node>::end()
-{
-    return &m_tailSentinel;
-}
-
-template <typename Node> inline void SentinelLinkedList<Node>::push(Node* node)
-{
-    ASSERT(node);
-    Node* prev = &m_headSentinel;
-    Node* next = m_headSentinel.next();
-
-    node->setPrev(prev);
-    node->setNext(next);
-
-    prev->setNext(node);
-    next->setPrev(node);
-}
-
-template <typename Node> inline void SentinelLinkedList<Node>::remove(Node* node)
-{
-    Node* prev = node->prev();
-    Node* next = node->next();
-
-    prev->setNext(next);
-    next->setPrev(prev);
-}
-
-}
-
-using WTF::SentinelLinkedList;
-
-#endif
-