89 lines
2.1 KiB
C++
89 lines
2.1 KiB
C++
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/*===================================================================
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Microsoft Denali
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Microsoft Confidential.
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Copyright 1996 Microsoft Corporation. All Rights Reserved.
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Component: Hash tables with LRU threading
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File: DblLink.cpp
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Owner: DGottner
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simple, effective linked list manager
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===================================================================*/
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#include "denpre.h"
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#pragma hdrstop
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#include "DblLink.h"
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#include "memchk.h"
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/*------------------------------------------------------------------
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* C D b l L i n k
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*/
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/*===================================================================
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CDblLink::UnLink
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Unlink this element from the list that it currently resides on
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===================================================================*/
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void CDblLink::UnLink()
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{
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m_pLinkPrev->m_pLinkNext = m_pLinkNext;
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m_pLinkNext->m_pLinkPrev = m_pLinkPrev;
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// Paranoia:
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// reset the node to empty after the unlink
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//
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m_pLinkPrev = m_pLinkNext = this;
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}
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/*===================================================================
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CDblLink::AppendTo
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Append this link onto a list
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Parameters: pListHead - pointer to a the list header (itself
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a CDblLink) to append this item onto.
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Condition: the link must be UnLink'ed before this method is called
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===================================================================*/
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void CDblLink::AppendTo(CDblLink &ListHead)
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{
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UnLink();
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m_pLinkNext = &ListHead; // remember termination is at list head
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m_pLinkPrev = ListHead.m_pLinkPrev;
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ListHead.m_pLinkPrev->m_pLinkNext = this;
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ListHead.m_pLinkPrev = this;
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}
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/*===================================================================
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CDblLink::Prepend
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Prepend this link onto a list
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Parameters: pListHead - pointer to a the list header (itself
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a CDblLink) to prepend this item onto.
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Condition: the link must be UnLink'ed before this method is called
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===================================================================*/
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void CDblLink::PrependTo(CDblLink &ListHead)
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{
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UnLink();
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m_pLinkPrev = &ListHead;
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m_pLinkNext = ListHead.m_pLinkNext;
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ListHead.m_pLinkNext->m_pLinkPrev = this;
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ListHead.m_pLinkNext = this;
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}
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