linked_lists.h
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- /**
- * @file linked_lists.h
- * @brief LLLinkedList class header amd implementation file.
- *
- * $LicenseInfo:firstyear=2001&license=viewergpl$
- *
- * Copyright (c) 2001-2010, Linden Research, Inc.
- *
- * Second Life Viewer Source Code
- * The source code in this file ("Source Code") is provided by Linden Lab
- * to you under the terms of the GNU General Public License, version 2.0
- * ("GPL"), unless you have obtained a separate licensing agreement
- * ("Other License"), formally executed by you and Linden Lab. Terms of
- * the GPL can be found in doc/GPL-license.txt in this distribution, or
- * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
- *
- * There are special exceptions to the terms and conditions of the GPL as
- * it is applied to this Source Code. View the full text of the exception
- * in the file doc/FLOSS-exception.txt in this software distribution, or
- * online at
- * http://secondlifegrid.net/programs/open_source/licensing/flossexception
- *
- * By copying, modifying or distributing this software, you acknowledge
- * that you have read and understood your obligations described above,
- * and agree to abide by those obligations.
- *
- * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
- * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
- * COMPLETENESS OR PERFORMANCE.
- * $/LicenseInfo$
- */
- #ifndef LL_LINKED_LISTS_H
- #define LL_LINKED_LISTS_H
- /**
- * Provides a standard doubly linked list for fun and profit
- * Utilizes a neat trick off of Flipcode where the back pointer is a
- * pointer to a pointer, allowing easier transfer of nodes between lists, &c
- * And a template class, of course
- */
- #include "llerror.h"
- template <class DATA_TYPE> class LLLinkedList
- {
- public:
- friend class LLLinkNode;
- // External interface
- // basic constructor
- LLLinkedList() : mHead(NULL), mCurrentp(NULL), mInsertBefore(NULL)
- {
- mCurrentp = mHead.mNextp;
- mCurrentOperatingp = mHead.mNextp;
- mCount = 0;
- }
- // basic constructor
- LLLinkedList(BOOL (*insert_before)(DATA_TYPE *data_new, DATA_TYPE *data_tested)) : mHead(NULL), mCurrentp(NULL), mInsertBefore(insert_before)
- {
- mCurrentp = mHead.mNextp;
- mCurrentOperatingp = mHead.mNextp;
- mCount = 0;
- }
- // destructor destroys list and nodes, but not data in nodes
- ~LLLinkedList()
- {
- removeAllNodes();
- }
- // set mInsertBefore
- void setInsertBefore(BOOL (*insert_before)(DATA_TYPE *data_new, DATA_TYPE *data_tested))
- {
- mInsertBefore = insert_before;
- }
- //
- // WARNING!!!!!!!
- // addData and addDataSorted are NOT O(1) operations, but O(n) because they check
- // for existence of the data in the linked list first. Why, I don't know - djs
- // If you don't care about dupes, use addDataNoCheck
- //
- // put data into a node and stick it at the front of the list
- inline BOOL addData(DATA_TYPE *data);
- // put data into a node and sort into list by mInsertBefore()
- // calls normal add if mInsertBefore isn't set
- inline BOOL addDataSorted(DATA_TYPE *data);
- inline BOOL addDataNoCheck(DATA_TYPE *data);
- // bubbleSortList
- // does an improved bubble sort of the list . . . works best with almost sorted data
- // does nothing if mInsertBefore isn't set
- // Nota Bene: Swaps are accomplished by swapping data pointers
- inline void bubbleSortList();
- // put data into a node and stick it at the end of the list
- inline BOOL addDataAtEnd(DATA_TYPE *data);
- // returns number of items in the list
- inline S32 getLength() const;
- inline BOOL isEmpty();
- // search the list starting at mHead.mNextp and remove the link with mDatap == data
- // leave mCurrentp and mCurrentOperatingp on the next entry
- // return TRUE if found, FALSE if not found
- inline BOOL removeData(DATA_TYPE *data);
- // search the list starting at mHead.mNextp and delete the link with mDatap == data
- // leave mCurrentp and mCurrentOperatingp on the next entry
- // return TRUE if found, FALSE if not found
- inline BOOL deleteData(DATA_TYPE *data);
- // remove all nodes from the list and delete the associated data
- inline void deleteAllData();
- // remove all nodes from the list but do not delete data
- inline void removeAllNodes();
- // check to see if data is in list
- // if TRUE then mCurrentp and mCurrentOperatingp point to data
- inline BOOL checkData(DATA_TYPE *data);
- // place mCurrentp on first node
- inline void resetList();
- // return the data currently pointed to, set mCurentOperatingp to that node and bump mCurrentp
- inline DATA_TYPE *getCurrentData();
- // same as getCurrentData() but a more intuitive name for the operation
- inline DATA_TYPE *getNextData();
- // reset the list and return the data currently pointed to, set mCurentOperatingp to that node and bump mCurrentp
- inline DATA_TYPE *getFirstData();
- // reset the list and return the data at position n, set mCurentOperatingp to that node and bump mCurrentp
- // Note: n is zero-based
- inline DATA_TYPE *getNthData( U32 n);
- // reset the list and return the last data in it, set mCurentOperatingp to that node and bump mCurrentp
- inline DATA_TYPE *getLastData();
- // remove the Node at mCurentOperatingp
- // leave mCurrentp and mCurentOperatingp on the next entry
- inline void removeCurrentData();
- // remove the Node at mCurentOperatingp and add it to newlist
- // leave mCurrentp and mCurentOperatingp on the next entry
- void moveCurrentData(LLLinkedList *newlist, BOOL b_sort);
- BOOL moveData(DATA_TYPE *data, LLLinkedList *newlist, BOOL b_sort);
- // delete the Node at mCurentOperatingp
- // leave mCurrentp anf mCurentOperatingp on the next entry
- void deleteCurrentData();
- private:
- // node that actually contains the data
- class LLLinkNode
- {
- public:
- // assign the mDatap pointer
- LLLinkNode(DATA_TYPE *data) : mDatap(data), mNextp(NULL), mPrevpp(NULL)
- {
- }
- // destructor does not, by default, destroy associated data
- // however, the mDatap must be NULL to ensure that we aren't causing memory leaks
- ~LLLinkNode()
- {
- if (mDatap)
- {
- llerror("Attempting to call LLLinkNode destructor with a non-null mDatap!", 1);
- }
- }
- // delete associated data and NULL out pointer
- void deleteData()
- {
- delete mDatap;
- mDatap = NULL;
- }
- // NULL out pointer
- void removeData()
- {
- mDatap = NULL;
- }
- DATA_TYPE *mDatap;
- LLLinkNode *mNextp;
- LLLinkNode **mPrevpp;
- };
- // add a node at the front of the list
- void addData(LLLinkNode *node)
- {
- // don't allow NULL to be passed to addData
- if (!node)
- {
- llerror("NULL pointer passed to LLLinkedList::addData", 0);
- }
- // add the node to the front of the list
- node->mPrevpp = &mHead.mNextp;
- node->mNextp = mHead.mNextp;
- // if there's something in the list, fix its back pointer
- if (node->mNextp)
- {
- node->mNextp->mPrevpp = &node->mNextp;
- }
- mHead.mNextp = node;
- }
- LLLinkNode mHead; // fake head node. . . makes pointer operations faster and easier
- LLLinkNode *mCurrentp; // mCurrentp is the Node that getCurrentData returns
- LLLinkNode *mCurrentOperatingp; // this is the node that the various mumbleCurrentData functions act on
- BOOL (*mInsertBefore)(DATA_TYPE *data_new, DATA_TYPE *data_tested); // user function set to allow sorted lists
- U32 mCount;
- };
- template <class DATA_TYPE>
- BOOL LLLinkedList<DATA_TYPE>::addData(DATA_TYPE *data)
- {
- // don't allow NULL to be passed to addData
- if (!data)
- {
- llerror("NULL pointer passed to LLLinkedList::addData", 0);
- }
- LLLinkNode *tcurr = mCurrentp;
- LLLinkNode *tcurrop = mCurrentOperatingp;
- if ( checkData(data))
- {
- mCurrentp = tcurr;
- mCurrentOperatingp = tcurrop;
- return FALSE;
- }
- // make the new node
- LLLinkNode *temp = new LLLinkNode(data);
- // add the node to the front of the list
- temp->mPrevpp = &mHead.mNextp;
- temp->mNextp = mHead.mNextp;
- // if there's something in the list, fix its back pointer
- if (temp->mNextp)
- {
- temp->mNextp->mPrevpp = &temp->mNextp;
- }
- mHead.mNextp = temp;
- mCurrentp = tcurr;
- mCurrentOperatingp = tcurrop;
- mCount++;
- return TRUE;
- }
- template <class DATA_TYPE>
- BOOL LLLinkedList<DATA_TYPE>::addDataNoCheck(DATA_TYPE *data)
- {
- // don't allow NULL to be passed to addData
- if (!data)
- {
- llerror("NULL pointer passed to LLLinkedList::addData", 0);
- }
- LLLinkNode *tcurr = mCurrentp;
- LLLinkNode *tcurrop = mCurrentOperatingp;
- // make the new node
- LLLinkNode *temp = new LLLinkNode(data);
- // add the node to the front of the list
- temp->mPrevpp = &mHead.mNextp;
- temp->mNextp = mHead.mNextp;
- // if there's something in the list, fix its back pointer
- if (temp->mNextp)
- {
- temp->mNextp->mPrevpp = &temp->mNextp;
- }
- mHead.mNextp = temp;
- mCurrentp = tcurr;
- mCurrentOperatingp = tcurrop;
- mCount++;
- return TRUE;
- }
- template <class DATA_TYPE>
- BOOL LLLinkedList<DATA_TYPE>::addDataSorted(DATA_TYPE *data)
- {
- LLLinkNode *tcurr = mCurrentp;
- LLLinkNode *tcurrop = mCurrentOperatingp;
- // don't allow NULL to be passed to addData
- if (!data)
- {
- llerror("NULL pointer passed to LLLinkedList::addDataSorted", 0);
- }
- if (checkData(data))
- {
- // restore
- mCurrentp = tcurr;
- mCurrentOperatingp = tcurrop;
- return FALSE;
- }
- // mInsertBefore not set?
- if (!mInsertBefore)
- {
- addData(data);
- // restore
- mCurrentp = tcurr;
- mCurrentOperatingp = tcurrop;
- return FALSE;
- }
- // empty list?
- if (!mHead.mNextp)
- {
- addData(data);
- // restore
- mCurrentp = tcurr;
- mCurrentOperatingp = tcurrop;
- return TRUE;
- }
- // make the new node
- LLLinkNode *temp = new LLLinkNode(data);
- // walk the list until mInsertBefore returns true
- mCurrentp = mHead.mNextp;
- while (mCurrentp->mNextp)
- {
- if (mInsertBefore(data, mCurrentp->mDatap))
- {
- // insert before the current one
- temp->mPrevpp = mCurrentp->mPrevpp;
- temp->mNextp = mCurrentp;
- *(temp->mPrevpp) = temp;
- mCurrentp->mPrevpp = &temp->mNextp;
- // restore
- mCurrentp = tcurr;
- mCurrentOperatingp = tcurrop;
- mCount++;
- return TRUE;
- }
- else
- {
- mCurrentp = mCurrentp->mNextp;
- }
- }
- // on the last element, add before?
- if (mInsertBefore(data, mCurrentp->mDatap))
- {
- // insert before the current one
- temp->mPrevpp = mCurrentp->mPrevpp;
- temp->mNextp = mCurrentp;
- *(temp->mPrevpp) = temp;
- mCurrentp->mPrevpp = &temp->mNextp;
- // restore
- mCurrentp = tcurr;
- mCurrentOperatingp = tcurrop;
- }
- else // insert after
- {
- temp->mPrevpp = &mCurrentp->mNextp;
- temp->mNextp = NULL;
- mCurrentp->mNextp = temp;
- // restore
- mCurrentp = tcurr;
- mCurrentOperatingp = tcurrop;
- }
- mCount++;
- return TRUE;
- }
- template <class DATA_TYPE>
- void LLLinkedList<DATA_TYPE>::bubbleSortList()
- {
- // mInsertBefore not set
- if (!mInsertBefore)
- {
- return;
- }
- LLLinkNode *tcurr = mCurrentp;
- LLLinkNode *tcurrop = mCurrentOperatingp;
- BOOL b_swapped = FALSE;
- DATA_TYPE *temp;
- // Nota Bene: This will break if more than 0x7FFFFFFF members in list!
- S32 length = 0x7FFFFFFF;
- S32 count = 0;
- do
- {
- b_swapped = FALSE;
- mCurrentp = mHead.mNextp;
- count = 0;
- while ( (count + 1 < length)
- &&(mCurrentp))
- {
- if (mCurrentp->mNextp)
- {
- if (!mInsertBefore(mCurrentp->mDatap, mCurrentp->mNextp->mDatap))
- {
- // swap data pointers!
- temp = mCurrentp->mDatap;
- mCurrentp->mDatap = mCurrentp->mNextp->mDatap;
- mCurrentp->mNextp->mDatap = temp;
- b_swapped = TRUE;
- }
- }
- else
- {
- break;
- }
- count++;
- mCurrentp = mCurrentp->mNextp;
- }
- length = count;
- } while (b_swapped);
- // restore
- mCurrentp = tcurr;
- mCurrentOperatingp = tcurrop;
- }
- template <class DATA_TYPE>
- BOOL LLLinkedList<DATA_TYPE>::addDataAtEnd(DATA_TYPE *data)
- {
- LLLinkNode *tcurr = mCurrentp;
- LLLinkNode *tcurrop = mCurrentOperatingp;
- // don't allow NULL to be passed to addData
- if (!data)
- {
- llerror("NULL pointer passed to LLLinkedList::addData", 0);
- }
- if (checkData(data))
- {
- mCurrentp = tcurr;
- mCurrentOperatingp = tcurrop;
- return FALSE;
- }
- // make the new node
- LLLinkNode *temp = new LLLinkNode(data);
- // add the node to the end of the list
- // if empty, add to the front and be done with it
- if (!mHead.mNextp)
- {
- temp->mPrevpp = &mHead.mNextp;
- temp->mNextp = NULL;
- mHead.mNextp = temp;
- }
- else
- {
- // otherwise, walk to the end of the list
- mCurrentp = mHead.mNextp;
- while (mCurrentp->mNextp)
- {
- mCurrentp = mCurrentp->mNextp;
- }
- temp->mPrevpp = &mCurrentp->mNextp;
- temp->mNextp = NULL;
- mCurrentp->mNextp = temp;
- }
- // restore
- mCurrentp = tcurr;
- mCurrentOperatingp = tcurrop;
- mCount++;
- return TRUE;
- }
- // returns number of items in the list
- template <class DATA_TYPE>
- S32 LLLinkedList<DATA_TYPE>::getLength() const
- {
- // S32 length = 0;
- // for (LLLinkNode* temp = mHead.mNextp; temp != NULL; temp = temp->mNextp)
- // {
- // length++;
- // }
- return mCount;
- }
- template <class DATA_TYPE>
- BOOL LLLinkedList<DATA_TYPE>::isEmpty()
- {
- return (mCount == 0);
- }
- // search the list starting at mHead.mNextp and remove the link with mDatap == data
- // leave mCurrentp and mCurrentOperatingp on the next entry
- // return TRUE if found, FALSE if not found
- template <class DATA_TYPE>
- BOOL LLLinkedList<DATA_TYPE>::removeData(DATA_TYPE *data)
- {
- BOOL b_found = FALSE;
- // don't allow NULL to be passed to addData
- if (!data)
- {
- llerror("NULL pointer passed to LLLinkedList::removeData", 0);
- }
- LLLinkNode *tcurr = mCurrentp;
- LLLinkNode *tcurrop = mCurrentOperatingp;
- mCurrentp = mHead.mNextp;
- mCurrentOperatingp = mHead.mNextp;
- while (mCurrentOperatingp)
- {
- if (mCurrentOperatingp->mDatap == data)
- {
- b_found = TRUE;
- // remove the node
- // if there is a next one, fix it
- if (mCurrentOperatingp->mNextp)
- {
- mCurrentOperatingp->mNextp->mPrevpp = mCurrentOperatingp->mPrevpp;
- }
- *(mCurrentOperatingp->mPrevpp) = mCurrentOperatingp->mNextp;
- // remove the LLLinkNode
- // if we were on the one we want to delete, bump the cached copies
- if (mCurrentOperatingp == tcurrop)
- {
- tcurrop = tcurr = mCurrentOperatingp->mNextp;
- }
- else if (mCurrentOperatingp == tcurr)
- {
- tcurrop = tcurr = mCurrentOperatingp->mNextp;
- }
- mCurrentp = mCurrentOperatingp->mNextp;
- mCurrentOperatingp->removeData();
- delete mCurrentOperatingp;
- mCurrentOperatingp = mCurrentp;
- mCount--;
- break;
- }
- mCurrentOperatingp = mCurrentOperatingp->mNextp;
- }
- // restore
- mCurrentp = tcurr;
- mCurrentOperatingp = tcurrop;
- return b_found;
- }
- // search the list starting at mHead.mNextp and delete the link with mDatap == data
- // leave mCurrentp and mCurrentOperatingp on the next entry
- // return TRUE if found, FALSE if not found
- template <class DATA_TYPE>
- BOOL LLLinkedList<DATA_TYPE>::deleteData(DATA_TYPE *data)
- {
- BOOL b_found = FALSE;
- // don't allow NULL to be passed to addData
- if (!data)
- {
- llerror("NULL pointer passed to LLLinkedList::removeData", 0);
- }
- LLLinkNode *tcurr = mCurrentp;
- LLLinkNode *tcurrop = mCurrentOperatingp;
- mCurrentp = mHead.mNextp;
- mCurrentOperatingp = mHead.mNextp;
- while (mCurrentOperatingp)
- {
- if (mCurrentOperatingp->mDatap == data)
- {
- b_found = TRUE;
- // remove the node
- // if there is a next one, fix it
- if (mCurrentOperatingp->mNextp)
- {
- mCurrentOperatingp->mNextp->mPrevpp = mCurrentOperatingp->mPrevpp;
- }
- *(mCurrentOperatingp->mPrevpp) = mCurrentOperatingp->mNextp;
- // delete the LLLinkNode
- // if we were on the one we want to delete, bump the cached copies
- if (mCurrentOperatingp == tcurrop)
- {
- tcurrop = tcurr = mCurrentOperatingp->mNextp;
- }
- // and delete the associated data
- llassert(mCurrentOperatingp);
- mCurrentp = mCurrentOperatingp->mNextp;
- mCurrentOperatingp->deleteData();
- delete mCurrentOperatingp;
- mCurrentOperatingp = mCurrentp;
- mCount--;
- break;
- }
- mCurrentOperatingp = mCurrentOperatingp->mNextp;
- }
- // restore
- mCurrentp = tcurr;
- mCurrentOperatingp = tcurrop;
- return b_found;
- }
- // remove all nodes from the list and delete the associated data
- template <class DATA_TYPE>
- void LLLinkedList<DATA_TYPE>::deleteAllData()
- {
- LLLinkNode *temp;
- // reset mCurrentp
- mCurrentp = mHead.mNextp;
- while (mCurrentp)
- {
- temp = mCurrentp->mNextp;
- mCurrentp->deleteData();
- delete mCurrentp;
- mCurrentp = temp;
- }
- // reset mHead and mCurrentp
- mHead.mNextp = NULL;
- mCurrentp = mHead.mNextp;
- mCurrentOperatingp = mHead.mNextp;
- mCount = 0;
- }
- // remove all nodes from the list but do not delete data
- template <class DATA_TYPE>
- void LLLinkedList<DATA_TYPE>::removeAllNodes()
- {
- LLLinkNode *temp;
- // reset mCurrentp
- mCurrentp = mHead.mNextp;
- while (mCurrentp)
- {
- temp = mCurrentp->mNextp;
- mCurrentp->removeData();
- delete mCurrentp;
- mCurrentp = temp;
- }
- // reset mHead and mCurrentp
- mHead.mNextp = NULL;
- mCurrentp = mHead.mNextp;
- mCurrentOperatingp = mHead.mNextp;
- mCount = 0;
- }
- // check to see if data is in list
- // if TRUE then mCurrentp and mCurrentOperatingp point to data
- template <class DATA_TYPE>
- BOOL LLLinkedList<DATA_TYPE>::checkData(DATA_TYPE *data)
- {
- // reset mCurrentp
- mCurrentp = mHead.mNextp;
- while (mCurrentp)
- {
- if (mCurrentp->mDatap == data)
- {
- mCurrentOperatingp = mCurrentp;
- return TRUE;
- }
- mCurrentp = mCurrentp->mNextp;
- }
- mCurrentOperatingp = mCurrentp;
- return FALSE;
- }
- // place mCurrentp on first node
- template <class DATA_TYPE>
- void LLLinkedList<DATA_TYPE>::resetList()
- {
- mCurrentp = mHead.mNextp;
- mCurrentOperatingp = mHead.mNextp;
- }
- // return the data currently pointed to, set mCurentOperatingp to that node and bump mCurrentp
- template <class DATA_TYPE>
- DATA_TYPE *LLLinkedList<DATA_TYPE>::getCurrentData()
- {
- if (mCurrentp)
- {
- mCurrentOperatingp = mCurrentp;
- mCurrentp = mCurrentp->mNextp;
- return mCurrentOperatingp->mDatap;
- }
- else
- {
- return NULL;
- }
- }
- // same as getCurrentData() but a more intuitive name for the operation
- template <class DATA_TYPE>
- DATA_TYPE *LLLinkedList<DATA_TYPE>::getNextData()
- {
- if (mCurrentp)
- {
- mCurrentOperatingp = mCurrentp;
- mCurrentp = mCurrentp->mNextp;
- return mCurrentOperatingp->mDatap;
- }
- else
- {
- return NULL;
- }
- }
- // reset the list and return the data currently pointed to, set mCurentOperatingp to that node and bump mCurrentp
- template <class DATA_TYPE>
- DATA_TYPE *LLLinkedList<DATA_TYPE>::getFirstData()
- {
- mCurrentp = mHead.mNextp;
- mCurrentOperatingp = mHead.mNextp;
- if (mCurrentp)
- {
- mCurrentOperatingp = mCurrentp;
- mCurrentp = mCurrentp->mNextp;
- return mCurrentOperatingp->mDatap;
- }
- else
- {
- return NULL;
- }
- }
- // Note: n is zero-based
- template <class DATA_TYPE>
- DATA_TYPE *LLLinkedList<DATA_TYPE>::getNthData( U32 n )
- {
- mCurrentOperatingp = mHead.mNextp;
- // if empty, return NULL
- if (!mCurrentOperatingp)
- {
- return NULL;
- }
- for( U32 i = 0; i < n; i++ )
- {
- mCurrentOperatingp = mCurrentOperatingp->mNextp;
- if( !mCurrentOperatingp )
- {
- return NULL;
- }
- }
- mCurrentp = mCurrentOperatingp->mNextp;
- return mCurrentOperatingp->mDatap;
- }
- // reset the list and return the last data in it, set mCurentOperatingp to that node and bump mCurrentp
- template <class DATA_TYPE>
- DATA_TYPE *LLLinkedList<DATA_TYPE>::getLastData()
- {
- mCurrentOperatingp = mHead.mNextp;
- // if empty, return NULL
- if (!mCurrentOperatingp)
- return NULL;
- // walk until we're pointing at the last entry
- while (mCurrentOperatingp->mNextp)
- {
- mCurrentOperatingp = mCurrentOperatingp->mNextp;
- }
- mCurrentp = mCurrentOperatingp->mNextp;
- return mCurrentOperatingp->mDatap;
- }
- // remove the Node at mCurentOperatingp
- // leave mCurrentp and mCurentOperatingp on the next entry
- // return TRUE if found, FALSE if not found
- template <class DATA_TYPE>
- void LLLinkedList<DATA_TYPE>::removeCurrentData()
- {
- if (mCurrentOperatingp)
- {
- // remove the node
- // if there is a next one, fix it
- if (mCurrentOperatingp->mNextp)
- {
- mCurrentOperatingp->mNextp->mPrevpp = mCurrentOperatingp->mPrevpp;
- }
- *(mCurrentOperatingp->mPrevpp) = mCurrentOperatingp->mNextp;
- // remove the LLLinkNode
- mCurrentp = mCurrentOperatingp->mNextp;
- mCurrentOperatingp->removeData();
- delete mCurrentOperatingp;
- mCount--;
- mCurrentOperatingp = mCurrentp;
- }
- }
- // remove the Node at mCurentOperatingp and add it to newlist
- // leave mCurrentp and mCurentOperatingp on the next entry
- // return TRUE if found, FALSE if not found
- template <class DATA_TYPE>
- void LLLinkedList<DATA_TYPE>::moveCurrentData(LLLinkedList *newlist, BOOL b_sort)
- {
- if (mCurrentOperatingp)
- {
- // remove the node
- // if there is a next one, fix it
- if (mCurrentOperatingp->mNextp)
- {
- mCurrentOperatingp->mNextp->mPrevpp = mCurrentOperatingp->mPrevpp;
- }
- *(mCurrentOperatingp->mPrevpp) = mCurrentOperatingp->mNextp;
- // remove the LLLinkNode
- mCurrentp = mCurrentOperatingp->mNextp;
- // move the node to the new list
- newlist->addData(mCurrentOperatingp);
- if (b_sort)
- bubbleSortList();
- mCurrentOperatingp = mCurrentp;
- }
- }
- template <class DATA_TYPE>
- BOOL LLLinkedList<DATA_TYPE>::moveData(DATA_TYPE *data, LLLinkedList *newlist, BOOL b_sort)
- {
- BOOL b_found = FALSE;
- // don't allow NULL to be passed to addData
- if (!data)
- {
- llerror("NULL pointer passed to LLLinkedList::removeData", 0);
- }
- LLLinkNode *tcurr = mCurrentp;
- LLLinkNode *tcurrop = mCurrentOperatingp;
- mCurrentp = mHead.mNextp;
- mCurrentOperatingp = mHead.mNextp;
- while (mCurrentOperatingp)
- {
- if (mCurrentOperatingp->mDatap == data)
- {
- b_found = TRUE;
- // remove the node
- // if there is a next one, fix it
- if (mCurrentOperatingp->mNextp)
- {
- mCurrentOperatingp->mNextp->mPrevpp = mCurrentOperatingp->mPrevpp;
- }
- *(mCurrentOperatingp->mPrevpp) = mCurrentOperatingp->mNextp;
- // if we were on the one we want to delete, bump the cached copies
- if ( (mCurrentOperatingp == tcurrop)
- ||(mCurrentOperatingp == tcurr))
- {
- tcurrop = tcurr = mCurrentOperatingp->mNextp;
- }
- // remove the LLLinkNode
- mCurrentp = mCurrentOperatingp->mNextp;
- // move the node to the new list
- newlist->addData(mCurrentOperatingp);
- if (b_sort)
- newlist->bubbleSortList();
- mCurrentOperatingp = mCurrentp;
- break;
- }
- mCurrentOperatingp = mCurrentOperatingp->mNextp;
- }
- // restore
- mCurrentp = tcurr;
- mCurrentOperatingp = tcurrop;
- return b_found;
- }
- // delete the Node at mCurentOperatingp
- // leave mCurrentp anf mCurentOperatingp on the next entry
- // return TRUE if found, FALSE if not found
- template <class DATA_TYPE>
- void LLLinkedList<DATA_TYPE>::deleteCurrentData()
- {
- if (mCurrentOperatingp)
- {
- // remove the node
- // if there is a next one, fix it
- if (mCurrentOperatingp->mNextp)
- {
- mCurrentOperatingp->mNextp->mPrevpp = mCurrentOperatingp->mPrevpp;
- }
- *(mCurrentOperatingp->mPrevpp) = mCurrentOperatingp->mNextp;
- // remove the LLLinkNode
- mCurrentp = mCurrentOperatingp->mNextp;
- mCurrentOperatingp->deleteData();
- if (mCurrentOperatingp->mDatap)
- llerror("This is impossible!", 0);
- delete mCurrentOperatingp;
- mCurrentOperatingp = mCurrentp;
- mCount--;
- }
- }
- #endif