893 lines
14 KiB
C
893 lines
14 KiB
C
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/*++
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TFDLIST.H
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This header file defines templates for manipulating doubly linked lists.
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These are intrusive lists - the client must provide a DLIST_ENTRY item
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within each data member for us to maintain the list.
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--*/
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#ifndef _TFDLIST_H_
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#define _TFDLIST_H_
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class DLIST_ENTRY {
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/*++
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Class Description :
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This class is intended to be incorporated into classes which are held
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within doubly linked lists. This class will define two pointers used
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to chain the items within the lists.
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IMPORTANT : m_pNext and m_pPrev point to DLIST_ENTRY's and not to the
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top of the containing item - the template classes provided following here
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are to be used to manipulate these items.
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--*/
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private :
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//
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// These are private - they don't make sense for clients !
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//
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DLIST_ENTRY( DLIST_ENTRY& ) ;
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DLIST_ENTRY& operator=(DLIST_ENTRY&) ;
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protected :
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//
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// The items which allows maintain the doubly linked list !
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//
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class DLIST_ENTRY* m_pNext ;
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class DLIST_ENTRY* m_pPrev ;
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//
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// The base class for all iterators !
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//
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friend class DLISTIterator ;
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void
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InsertAfter( DLIST_ENTRY* p ) {
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/*++
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Routine Description :
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Insert an item into the list after THIS !
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Arguments :
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p - the item to be inserted !
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Return Value
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None.
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--*/
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_ASSERT( m_pNext != 0 ) ;
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_ASSERT( m_pPrev != 0 ) ;
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_ASSERT( p->m_pNext == p ) ;
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_ASSERT( p->m_pPrev == p ) ;
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DLIST_ENTRY* pNext = m_pNext ;
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p->m_pNext = pNext ;
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p->m_pPrev = this ;
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pNext->m_pPrev = p ;
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m_pNext = p ;
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}
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void
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InsertBefore( DLIST_ENTRY* p ) {
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/*++
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Routine Description :
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Insert an item into the list before THIS !
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Arguments :
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p - the item to be inserted !
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Return Value
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None.
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--*/
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_ASSERT( m_pNext != 0 ) ;
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_ASSERT( m_pPrev != 0 ) ;
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_ASSERT( p->m_pNext == p ) ;
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_ASSERT( p->m_pPrev == p ) ;
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DLIST_ENTRY* pPrev = m_pPrev ;
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p->m_pNext = this ;
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p->m_pPrev = pPrev ;
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pPrev->m_pNext = p ;
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m_pPrev = p ;
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}
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public :
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//
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// Initialize a list !
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//
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DLIST_ENTRY() {
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m_pNext = this ;
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m_pPrev = this ;
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}
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//
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// It would be nice to comment out this Destructor in Retail builds,
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// however - VC5 has a compiler bug where if you allocate an array of
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// DLIST_ENTRY objects it adds a DWORD to hold the number of allocated
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// objects. Unless you have a Destructor (even a do nothing like this
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// one will be in retail), the delete[] operator won't do the math
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// to account for the DWORD counter - and you get Assert's etc...
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// in your memory allocators.
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//
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//#ifdef DEBUG
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//
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// Destroy an item in a list - should be empty when destroyed !
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//
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~DLIST_ENTRY() {
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_ASSERT( m_pNext == this ) ;
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_ASSERT( m_pPrev == this ) ;
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_ASSERT( m_pNext == m_pPrev ) ;
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}
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//#endif
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BOOL
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IsEmpty() {
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/*++
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Routine Description :
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This function returns TRUE if there is nothing else in the list but us.
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Arguments :
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None.
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Return Value :
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TRUE if Empty, FALSE otherwise !
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--*/
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_ASSERT( m_pPrev != 0 && m_pNext != 0 ) ;
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return m_pPrev == this ;
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}
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void
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RemoveEntry( ) {
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/*++
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Routine Description :
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Remote this item from the list !
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Arguments :
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None.
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Return Value :
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None.
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--*/
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_ASSERT( m_pNext != 0 ) ;
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_ASSERT( m_pPrev != 0 ) ;
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DLIST_ENTRY* pPrev = m_pPrev ;
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DLIST_ENTRY* pNext = m_pNext ;
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pPrev->m_pNext = pNext ;
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pNext->m_pPrev = pPrev ;
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m_pPrev = this ;
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m_pNext = this ;
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}
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void
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Join( DLIST_ENTRY& head ) {
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/*++
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Routine Description :
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Take one list and join it with another.
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The referenced head of the list is not to become an element in the list,
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and is left with an empty head !
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Arguments ;
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head - the head of the list that is to become empty, and whose elements
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are to be joined into this list !
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Return Value :
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None.
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--*/
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_ASSERT( m_pNext != 0 ) ;
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_ASSERT( m_pPrev != 0 ) ;
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if( !head.IsEmpty() ) {
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//
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// First - save the guy that is at the head of our list !
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//
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DLIST_ENTRY* pNext = m_pNext ;
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head.m_pPrev->m_pNext = pNext ;
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pNext->m_pPrev = head.m_pPrev ;
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head.m_pNext->m_pPrev = this ;
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m_pNext = head.m_pNext ;
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head.m_pNext = &head ;
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head.m_pPrev = &head ;
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}
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_ASSERT( head.IsEmpty() ) ;
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}
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} ;
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class DLISTIterator {
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/*++
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Class Description :
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Implement an iterator which can go both directions over
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doubly linked lists built on the DLIST_ENTRY class !
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This is the base class for a set of templates that will
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provide iteration over generic items which contain DLIST_ENTRY
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objects for their list manipulation !
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--*/
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protected :
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//
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// The current position in the list !
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//
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DLIST_ENTRY *m_pCur ;
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//
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// the DLIST_ENTRY which is both head & tail of the list
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// (since it is circular !)
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//
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DLIST_ENTRY *m_pHead ;
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public :
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//
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// TRUE if we're using the m_pNext pointers to go forward !
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// This member should not be manipulated by clients - its exposed
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// for read only purposes only.
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//
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BOOL m_fForward ;
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DLISTIterator(
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DLIST_ENTRY* pHead,
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BOOL fForward = TRUE
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) :
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m_pHead( pHead ),
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m_fForward( fForward ),
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m_pCur( fForward ? pHead->m_pNext : pHead->m_pPrev ) {
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_ASSERT( m_pHead != 0 ) ;
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}
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void
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ReBind( DLIST_ENTRY* pHead,
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BOOL fForward
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) {
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m_pHead = pHead ;
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m_fForward = fForward ;
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m_pCur = fForward ? pHead->m_pNext : pHead->m_pPrev ;
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}
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void
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ReBind( DLIST_ENTRY* pHead ) {
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m_pHead = pHead ;
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m_pCur = m_fForward ? pHead->m_pNext : pHead->m_pPrev ;
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}
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void
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Prev() {
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/*++
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Routine Description :
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This function moves the iterator back one slot.
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Note that m_pHead is the end of the list, and we avoiud
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setting m_pCur equal to m_pHead !
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Arguments :
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None.
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Return Value :
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None.
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--*/
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_ASSERT( m_pCur != m_pHead || m_pHead->IsEmpty() || m_fForward ) ;
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m_pCur = m_pCur->m_pPrev ;
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m_fForward = FALSE ;
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}
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void
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Next() {
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/*++
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Routine Description :
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This function moves the iterator forward one slot.
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Note that m_pHead is the end of the list, and we avoiud
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setting m_pCur equal to m_pHead !
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Arguments :
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None.
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Return Value :
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None.
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--*/
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_ASSERT( m_pCur != m_pHead || m_pHead->IsEmpty() || !m_fForward ) ;
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m_pCur = m_pCur->m_pNext ;
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m_fForward = TRUE ;
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}
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void
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Front() {
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/*++
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Routine Description :
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Reset the iterator to reference the first item of the list !
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Arguments :
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None.
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Return Value :
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None.
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--*/
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m_pCur = m_pHead->m_pNext ;
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m_fForward = TRUE ;
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}
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void
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Back() {
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/*++
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Routine Description :
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Reset the iterator to reference the last item of the list !
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Arguments :
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None.
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Return Value :
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None.
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--*/
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m_pCur = m_pHead->m_pPrev ;
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m_fForward = FALSE ;
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}
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BOOL
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AtEnd() {
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/*++
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Routine Description :
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Return TRUE if we are at the end of the list !
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This is a little more complicated to compute -
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depends on which way we are going !
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Arguments :
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None.
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Return Value :
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None.
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--*/
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return m_pCur == m_pHead ;
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}
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DLIST_ENTRY*
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CurrentEntry() {
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return m_pCur ;
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}
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DLIST_ENTRY*
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RemoveItemEntry() {
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/*++
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Routine Description :
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Remove the item that the iterator currently
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references from the list.
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If we are going forward then the iterator
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will be setting on the previous element,
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otherwise the iterator is left on the next element.
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We have to take care that we don't leave the iterator
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sitting on an invalid element.
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Arguments :
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None.
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Return Value :
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Pointer to the removed item.
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--*/
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if( m_pCur == m_pHead )
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return 0 ;
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DLIST_ENTRY* pTemp = m_pCur ;
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if( m_fForward ) {
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m_pCur = pTemp->m_pNext;
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} else {
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m_pCur = pTemp->m_pPrev ;
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}
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pTemp->RemoveEntry() ;
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return pTemp ;
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}
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void
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InsertBefore( DLIST_ENTRY* p ) {
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/*++
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Routine Description :
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Insert an item before our current position in the list !
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Arguments :
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None.
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Return Value :
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Nothin
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--*/
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m_pCur->InsertBefore( p ) ;
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}
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void
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InsertAfter( DLIST_ENTRY* p ) {
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/*++
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Routine Description :
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Insert an Item after our current position in the list !
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Arguments :
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None.
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Return Value :
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Nothin
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--*/
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m_pCur->InsertAfter( p ) ;
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}
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} ;
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template< class LISTHEAD >
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class TDListIterator : public DLISTIterator {
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/*++
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Class Description :
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This class provides an iterator which can walk over a specified List !
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--*/
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public :
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typedef LISTHEAD::EXPORTDATA Data ;
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private :
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#if 0
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//
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// Make the following functions private !
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// They come from DLISTIterator and are not for use by our customers !
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//
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void
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ReBind( DLIST_ENTRY* pHead,
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BOOL fForward
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) ;
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void
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ReBind( DLIST_ENTRY* pHead ) ;
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#endif
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//
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// Make the following functions private !
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// They come from DLISTIterator and are not for use by our customers !
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//
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DLIST_ENTRY*
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RemoveItemEntry() ;
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//
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// Make the following functions private !
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// They come from DLISTIterator and are not for use by our customers !
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//
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DLIST_ENTRY*
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CurrentEntry() ;
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//
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// Make the following functions private !
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// They come from DLISTIterator and are not for use by our customers !
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//
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void
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InsertBefore( DLIST_ENTRY* ) ;
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//
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// Make the following functions private !
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// They come from DLISTIterator and are not for use by our customers !
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//
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void
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InsertAfter( DLIST_ENTRY* ) ;
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public :
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TDListIterator(
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LISTHEAD* pHead,
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BOOL fForward = TRUE
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) :
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||
|
DLISTIterator( pHead, fForward ) {
|
||
|
}
|
||
|
|
||
|
TDListIterator(
|
||
|
LISTHEAD& head,
|
||
|
BOOL fForward = TRUE
|
||
|
) : DLISTIterator( &head, fForward ) {
|
||
|
}
|
||
|
|
||
|
TDListIterator(
|
||
|
DLIST_ENTRY* pHead,
|
||
|
BOOL fForward = TRUE
|
||
|
) :
|
||
|
DLISTIterator( pHead, fForward ) {
|
||
|
}
|
||
|
|
||
|
void
|
||
|
ReBind( LISTHEAD* pHead ) {
|
||
|
DLISTIterator::ReBind( pHead ) ;
|
||
|
}
|
||
|
|
||
|
void
|
||
|
ReBind( LISTHEAD* pHead, BOOL fForward ) {
|
||
|
DLISTIterator::ReBind( pHead, fForward ) ;
|
||
|
}
|
||
|
|
||
|
inline Data*
|
||
|
Current( ) {
|
||
|
return LISTHEAD::Convert( m_pCur ) ;
|
||
|
}
|
||
|
|
||
|
inline Data*
|
||
|
RemoveItem( ) {
|
||
|
DLIST_ENTRY* pTemp = DLISTIterator::RemoveItemEntry() ;
|
||
|
return LISTHEAD::Convert( pTemp ) ;
|
||
|
}
|
||
|
|
||
|
inline void
|
||
|
InsertBefore( Data* p ) {
|
||
|
DLIST_ENTRY* pTemp = LISTHEAD::Convert( p ) ;
|
||
|
DLISTIterator::InsertBefore( pTemp ) ;
|
||
|
}
|
||
|
|
||
|
inline void
|
||
|
InsertAfter( Data* p ) {
|
||
|
DLIST_ENTRY* pTemp = LISTHEAD::Convert( p ) ;
|
||
|
DLISTIterator::InsertAfter( pTemp ) ;
|
||
|
}
|
||
|
|
||
|
//
|
||
|
// For debug purposes - let people know what the head is !
|
||
|
//
|
||
|
LISTHEAD*
|
||
|
GetHead() {
|
||
|
return (LISTHEAD*)m_pHead ;
|
||
|
}
|
||
|
} ;
|
||
|
|
||
|
template< class Data,
|
||
|
Data::PFNDLIST pfnConvert >
|
||
|
class TDListHead : private DLIST_ENTRY {
|
||
|
/*++
|
||
|
|
||
|
Class Description :
|
||
|
|
||
|
This class defines the head of a doubly linked list of items of DATAHELPER::LISTDATA
|
||
|
We provide all the functions required to manipulate the list, and a mechanism
|
||
|
for creating iterators.
|
||
|
|
||
|
--*/
|
||
|
public :
|
||
|
|
||
|
//
|
||
|
// Publicly redefine the type that we deal with into a nice short form !
|
||
|
//
|
||
|
typedef Data EXPORTDATA ;
|
||
|
|
||
|
private :
|
||
|
|
||
|
//
|
||
|
// These kinds of iterators are our friends !
|
||
|
//
|
||
|
friend class TDListIterator< TDListHead<Data, pfnConvert> > ;
|
||
|
|
||
|
static inline Data*
|
||
|
Convert( DLIST_ENTRY* p ) {
|
||
|
/*++
|
||
|
|
||
|
Routine Description :
|
||
|
|
||
|
This function takes a pointer to a DLIST_ENTRY and returns a pointer
|
||
|
to the beginning of the data item !
|
||
|
|
||
|
Arguments :
|
||
|
|
||
|
p - pointer to a DLIST_ENTRY found within our list !
|
||
|
|
||
|
Return Value :
|
||
|
|
||
|
Pointer to the Data Item containing the referenced DLIST_ENTRY !
|
||
|
|
||
|
--*/
|
||
|
|
||
|
if( p ) {
|
||
|
return (Data*)(((PCHAR)p) - (PCHAR)(pfnConvert(0))) ;
|
||
|
}
|
||
|
return 0 ;
|
||
|
}
|
||
|
|
||
|
static inline DLIST_ENTRY*
|
||
|
Convert( Data* pData ) {
|
||
|
return pfnConvert(pData) ;
|
||
|
}
|
||
|
|
||
|
//
|
||
|
// Copy Constructor and Operator= are private, as they don't make sense !
|
||
|
//
|
||
|
|
||
|
|
||
|
public :
|
||
|
|
||
|
//
|
||
|
// Redefine this to be public !
|
||
|
//
|
||
|
inline BOOL
|
||
|
IsEmpty() {
|
||
|
return DLIST_ENTRY::IsEmpty() ;
|
||
|
}
|
||
|
|
||
|
inline void
|
||
|
PushFront( Data* pData ) {
|
||
|
/*++
|
||
|
|
||
|
Routine Description :
|
||
|
|
||
|
Push the Data item onto the front of the doubly linked list !
|
||
|
|
||
|
Arguments :
|
||
|
|
||
|
pData - item to add to the front of the list
|
||
|
|
||
|
Return Value :
|
||
|
|
||
|
None.
|
||
|
|
||
|
--*/
|
||
|
_ASSERT( pData != 0 ) ;
|
||
|
_ASSERT( m_pNext != 0 ) ;
|
||
|
_ASSERT( m_pPrev != 0 ) ;
|
||
|
DLIST_ENTRY* p = Convert(pData);
|
||
|
InsertAfter( p ) ;
|
||
|
_ASSERT( m_pNext != 0 ) ;
|
||
|
_ASSERT( m_pPrev != 0 ) ;
|
||
|
}
|
||
|
|
||
|
inline void
|
||
|
PushBack( Data* pData ) {
|
||
|
/*++
|
||
|
|
||
|
Routine Description :
|
||
|
|
||
|
Push the Data item onto the back of the doubly linked list !
|
||
|
|
||
|
Arguments :
|
||
|
|
||
|
pData - item to add to the front of the list
|
||
|
|
||
|
Return Value :
|
||
|
|
||
|
None.
|
||
|
|
||
|
--*/
|
||
|
|
||
|
_ASSERT( pData != 0 ) ;
|
||
|
_ASSERT( m_pNext != 0 ) ;
|
||
|
_ASSERT( m_pPrev != 0 ) ;
|
||
|
DLIST_ENTRY* p = Convert(pData) ;
|
||
|
InsertBefore( p ) ;
|
||
|
_ASSERT( m_pNext != 0 ) ;
|
||
|
_ASSERT( m_pPrev != 0 ) ;
|
||
|
}
|
||
|
|
||
|
inline Data*
|
||
|
PopFront() {
|
||
|
/*++
|
||
|
|
||
|
Routine Description :
|
||
|
|
||
|
Remove the data item from the front of the List !
|
||
|
|
||
|
Arguments :
|
||
|
|
||
|
None.
|
||
|
|
||
|
Return Value :
|
||
|
|
||
|
The front of the list - NULL if empty !
|
||
|
|
||
|
--*/
|
||
|
|
||
|
_ASSERT( m_pNext != 0 ) ;
|
||
|
_ASSERT( m_pPrev != 0 ) ;
|
||
|
DLIST_ENTRY* pReturn = 0;
|
||
|
if( m_pNext != this ) {
|
||
|
pReturn = m_pNext ;
|
||
|
pReturn->RemoveEntry() ;
|
||
|
}
|
||
|
_ASSERT( m_pNext != 0 ) ;
|
||
|
_ASSERT( m_pPrev != 0 ) ;
|
||
|
return Convert( pReturn ) ;
|
||
|
}
|
||
|
|
||
|
inline Data*
|
||
|
PopBack() {
|
||
|
/*++
|
||
|
|
||
|
Routine Description :
|
||
|
|
||
|
Remove the data item from the Back of the List !
|
||
|
|
||
|
Arguments :
|
||
|
|
||
|
None.
|
||
|
|
||
|
Return Value :
|
||
|
|
||
|
The Back of the list - NULL if empty !
|
||
|
|
||
|
--*/
|
||
|
|
||
|
|
||
|
_ASSERT( m_pNext != 0 ) ;
|
||
|
_ASSERT( m_pPrev != 0 ) ;
|
||
|
DLIST_ENTRY* pReturn = 0 ;
|
||
|
if( m_pPrev != this ) {
|
||
|
pReturn = m_pPrev ;
|
||
|
pReturn->RemoveEntry() ;
|
||
|
}
|
||
|
_ASSERT( m_pNext != 0 ) ;
|
||
|
_ASSERT( m_pPrev != 0 ) ;
|
||
|
return Convert( pReturn ) ;
|
||
|
}
|
||
|
|
||
|
static inline void
|
||
|
Remove( Data* pData ) {
|
||
|
/*++
|
||
|
|
||
|
Routine Description :
|
||
|
|
||
|
Remove the specified item from the list !
|
||
|
|
||
|
Arguments :
|
||
|
|
||
|
None.
|
||
|
|
||
|
Return Value :
|
||
|
|
||
|
The Back of the list - NULL if empty !
|
||
|
|
||
|
--*/
|
||
|
|
||
|
DLIST_ENTRY* p = Convert( pData ) ;
|
||
|
p->RemoveEntry() ;
|
||
|
}
|
||
|
|
||
|
inline Data*
|
||
|
GetFront() {
|
||
|
/*++
|
||
|
|
||
|
Routine Description :
|
||
|
|
||
|
Return the data item from the Front of the List !
|
||
|
|
||
|
Arguments :
|
||
|
|
||
|
None.
|
||
|
|
||
|
Return Value :
|
||
|
|
||
|
The Front of the list - NULL if empty !
|
||
|
|
||
|
--*/
|
||
|
|
||
|
|
||
|
_ASSERT( m_pNext != 0 ) ;
|
||
|
_ASSERT( m_pPrev != 0 ) ;
|
||
|
if( m_pNext == this ) {
|
||
|
return 0 ;
|
||
|
}
|
||
|
return Convert( m_pNext ) ;
|
||
|
}
|
||
|
|
||
|
inline Data*
|
||
|
GetBack() {
|
||
|
/*++
|
||
|
|
||
|
Routine Description :
|
||
|
|
||
|
Return the data item from the Back of the List !
|
||
|
|
||
|
Arguments :
|
||
|
|
||
|
None.
|
||
|
|
||
|
Return Value :
|
||
|
|
||
|
The Back of the list - NULL if empty !
|
||
|
|
||
|
--*/
|
||
|
|
||
|
|
||
|
_ASSERT( m_pNext != 0 ) ;
|
||
|
_ASSERT( m_pPrev != 0 ) ;
|
||
|
if( m_pPrev == this ) {
|
||
|
return 0 ;
|
||
|
}
|
||
|
return Convert( m_pPrev ) ;
|
||
|
}
|
||
|
|
||
|
inline void
|
||
|
Join( TDListHead& head ) {
|
||
|
/*++
|
||
|
|
||
|
Routine Description :
|
||
|
|
||
|
Take one list and join it with another.
|
||
|
The referenced head of the list is not to become an element in the list,
|
||
|
and is left with an empty head !
|
||
|
|
||
|
Arguments ;
|
||
|
|
||
|
head - the head of the list that is to become empty, and whose elements
|
||
|
are to be joined into this list !
|
||
|
|
||
|
Return Value :
|
||
|
|
||
|
None.
|
||
|
|
||
|
--*/
|
||
|
|
||
|
DLIST_ENTRY::Join( head ) ;
|
||
|
}
|
||
|
} ;
|
||
|
|
||
|
#endif // _TFDLIST_H_
|