562 lines
12 KiB
C++
562 lines
12 KiB
C++
//+---------------------------------------------------------------------------
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//
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// Copyright (C) Microsoft Corporation, 1992 - 1997.
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//
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// File: DBLINK.HXX
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//
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// Contents: Parametrized doubly linked list and iterators
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//
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// History: 15-Jun-92 BartoszM Created.
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//
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//----------------------------------------------------------------------------
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#pragma once
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//+---------------------------------------------------------------------------
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//
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// Class: CDoubleLink
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//
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// Purpose: Linked element
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//
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// History: 15-Jun-92 BartoszM Created.
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//
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// Notes: Use as base for your class. No need to override anything.
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//
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// class CFoo: public CDoubleLink
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// {
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// // your data and code goes here
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// };
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//
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//----------------------------------------------------------------------------
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class CDoubleLink
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{
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public:
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CDoubleLink* Next() { return _next; }
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CDoubleLink* Prev() { return _prev; }
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void Close() { _next = this; _prev = this; }
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BOOL IsSingle() const { return _next == this; }
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void Unlink()
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{
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_next->_prev = _prev;
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_prev->_next = _next;
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}
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void InsertBefore ( CDoubleLink* pAfter )
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{
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CDoubleLink* pBefore = pAfter->_prev;
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_next = pAfter;
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_prev = pBefore;
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pAfter->_prev = this;
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pBefore->_next = this;
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}
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void InsertAfter ( CDoubleLink* pBefore )
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{
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CDoubleLink* pAfter = pBefore->_next;
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_next = pAfter;
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_prev = pBefore;
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pAfter->_prev = this;
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pBefore->_next = this;
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}
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#ifdef CIEXTMODE
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void CiExtDump(void *ciExtSelf);
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#endif
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protected:
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CDoubleLink* _next;
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CDoubleLink* _prev;
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};
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//+---------------------------------------------------------------------------
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//
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// Class: CDoubleList
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//
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// Purpose: Linked list of indexes
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//
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// History: 15-Jun-92 BartoszM Created.
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//
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// Notes: Use as base for your own class.
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// Add methods as needed.
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// To implement searches use forward and backward
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// iterators described below. For instance, if you implement
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// a SORTED list:
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//
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// Foo* CFooList::Insert ( CFoo* pFoo )
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// {
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// for ( CBackFooIter it(*this); !AtEnd(it); BackUp(it) )
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// {
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// if ( it->Size() <= pFoo->Size() ) // overloaded operator ->
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// {
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// pFoo->InsertAfter(it.GetFoo());
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// return;
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// }
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// }
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// // end of list
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// Push(pFoo);
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// }
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//
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//----------------------------------------------------------------------------
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class CDoubleList
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{
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friend class CForwardIter;
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friend class CBackwardIter;
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friend class CDoubleIter;
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public:
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class CDoubleIter
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{
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friend class CDoubleList;
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protected:
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CDoubleIter ( CDoubleLink* pLink ) : _pLinkCur(pLink) {}
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CDoubleIter ( CDoubleIter& iter ) : _pLinkCur(iter._pLinkCur) {}
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CDoubleLink* _pLinkCur;
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};
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CDoubleList()
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{
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_root.Close();
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}
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BOOL IsEmpty() const { return _root.IsSingle(); }
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void Advance ( CDoubleIter& it );
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void BackUp ( CDoubleIter& it );
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BOOL AtEnd ( CDoubleIter& it);
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void SetToEnd( CDoubleIter& it )
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{
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Win4Assert( !IsEmpty() );
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it._pLinkCur = _root.Prev();
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}
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void SetToBeginning( CDoubleIter& it )
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{
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Win4Assert( !IsEmpty() );
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it._pLinkCur = _root.Next();
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}
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BOOL IsFirst( CDoubleLink & link )
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{
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return _root.Next() == &link;
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}
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BOOL IsLast( CDoubleLink & link )
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{
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return _root.Prev() == &link;
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}
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BOOL IsFirst( CDoubleIter & it )
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{
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Win4Assert( !AtEnd( it ) );
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return _root.Next() == it._pLinkCur;
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}
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BOOL IsLast( CDoubleIter & it )
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{
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Win4Assert( !AtEnd(it) );
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return _root.Prev() == it._pLinkCur;
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}
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// In derived class you can add your own Pop(), Top(), etc.
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// that will cast the results of _Pop(), _Top(), etc...
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#ifdef CIEXTMODE
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void CiExtDump(void *ciExtSelf);
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#endif
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protected:
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CDoubleLink* _Top() { return IsEmpty()? 0: _root.Next(); }
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BOOL _IsRoot ( CDoubleLink* pLink ) const
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{ return pLink == &_root; }
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void _Push ( CDoubleLink* pLink );
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void _Queue ( CDoubleLink* pLink );
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CDoubleLink* _Pop ( void );
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CDoubleLink * _Replace( CDoubleIter & it, CDoubleLink * pNew )
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{
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Win4Assert( !AtEnd(it) );
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Win4Assert( 0 != pNew );
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CDoubleLink * pCurr = it._pLinkCur;
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pNew->InsertAfter( pCurr );
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pCurr->Unlink();
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it._pLinkCur = pNew;
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return pCurr;
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}
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CDoubleLink _root;
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};
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//+---------------------------------------------------------------------------
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//
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// Class: CDoubleIter
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//
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// Purpose: Linked list iterator
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//
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// History: 17-Jun-92 BartoszM Created.
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//
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// Notes: Auxiliary class. See iterators below.
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//
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//----------------------------------------------------------------------------
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//+---------------------------------------------------------------------------
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//
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// Class: CForwardIter
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//
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// Purpose: Linked list iterator
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//
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// History: 17-Jun-92 BartoszM Created.
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//
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// Notes: Use as base for your own forward iterator.
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// Notice the overloading of operator ->
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// -------------------------------------
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// It lets you use iterator like a pointer to Foo.
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//
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// class CForFooIter : public CForwardIter
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// {
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// public:
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//
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// CForFooIter ( CFooList& list ) : CForwardIter(list) {}
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//
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// CFoo* operator->() { return (CFoo*) _pLinkCur; }
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// CFoo* GetFoo() { return (CFoo*) _pLinkCur; }
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// };
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//
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// Example of usage:
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// ----------------
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//
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// for ( CForFooIter it(fooList); !fooList.AtEnd(it); fooList.Advance(it))
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// {
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// it->FooMethod(); // operator ->
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// }
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//
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//----------------------------------------------------------------------------
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class CForwardIter: public CDoubleList::CDoubleIter
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{
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public:
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CForwardIter ( CDoubleList& list ): CDoubleIter(list._root.Next()) {}
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};
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//+---------------------------------------------------------------------------
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//
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// Class: CBackwardIter
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//
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// Purpose: Linked list iterator
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//
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// History: 17-Jun-92 BartoszM Created.
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//
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// Notes: See above.
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//
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//----------------------------------------------------------------------------
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class CBackwardIter: public CDoubleList::CDoubleIter
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{
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public:
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CBackwardIter ( CDoubleList& list ): CDoubleIter(list._root.Prev()) {}
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};
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//+---------------------------------------------------------------------------
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//
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// Member: CDoubleList::AtEnd, public
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//
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// Arguments: [it] -- iterator
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//
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// Returns: TRUE if iterator at end of list
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//
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// History: 17-Jun-92 BartoszM Created.
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//
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// Notes: Works for both iterators (forward and backward)
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//
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//----------------------------------------------------------------------------
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inline BOOL CDoubleList::AtEnd ( CDoubleIter& it)
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{
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return _IsRoot( it._pLinkCur );
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CDoubleList::Advance, public
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//
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// Synopsis: Advances an iterator
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//
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// Arguments: [it] -- iterator
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//
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// History: 17-Jun-92 BartoszM Created.
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//
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//----------------------------------------------------------------------------
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inline void CDoubleList::Advance ( CDoubleIter& it )
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{
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Win4Assert ( !_IsRoot(it._pLinkCur) );
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it._pLinkCur = it._pLinkCur->Next();
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CDoubleList::BackUp, public
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//
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// Synopsis: Backs up an iterator
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//
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// Arguments: [it] -- iterator
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//
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// History: 17-Jun-92 BartoszM Created.
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//
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//----------------------------------------------------------------------------
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inline void CDoubleList::BackUp ( CDoubleIter& it )
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{
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Win4Assert ( !_IsRoot(it._pLinkCur) );
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it._pLinkCur = it._pLinkCur->Prev();
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CDoubleList::Queue, private
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//
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// Arguments: [pLink] -- link to be queued
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//
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// History: 17-Mar-93 WadeR Created. (based on Push, below)
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//
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// Notest: Override, accept only derived class (type safety!), e.g.
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//
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// void CFooList::Queue ( CFoo* pFoo )
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// {
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// _Queue ( pFoo );
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// }
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//
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//----------------------------------------------------------------------------
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inline void CDoubleList::_Queue ( CDoubleLink* pLink )
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{
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pLink->InsertBefore ( &_root );
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CDoubleList::Push, private
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//
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// Arguments: [pLink] -- link to be pushed
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//
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// History: 17-Jun-92 BartoszM Created.
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//
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// Notest: Override, accept only derived class (type safety!), e.g.
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//
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// void CFooList::Push ( CFoo* pFoo )
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// {
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// _Push ( pFoo );
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// }
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//
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//----------------------------------------------------------------------------
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inline void CDoubleList::_Push ( CDoubleLink* pLink )
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{
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pLink->InsertAfter ( &_root );
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CDoubleList::_Pop, private
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//
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// History: 17-Jun-92 BartoszM Created.
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//
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// Notes: Override: cast the result
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//
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// CFoo* CFooList::Pop()
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// {
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// return (CFoo*) _Pop();
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// }
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//
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//----------------------------------------------------------------------------
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inline CDoubleLink* CDoubleList::_Pop ( void )
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{
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CDoubleLink* pLink = 0;
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if ( !IsEmpty() )
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{
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pLink = _root.Next();
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pLink->Unlink();
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}
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return pLink;
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}
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template <class T>
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class TDoubleList : public CDoubleList
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{
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public:
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TDoubleList() : _cEntries(0) {}
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~TDoubleList()
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{
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Clear();
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}
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T * Top()
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{
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return (T *) _Top();
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}
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BOOL IsRoot(T * pLink)
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{
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return _IsRoot( pLink );
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}
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void Push( T * pLink )
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{
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Win4Assert( 0 != pLink );
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_Push( pLink );
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_cEntries++;
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}
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void Queue( T * pLink )
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{
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Win4Assert( 0 != pLink );
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_Queue( pLink );
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_cEntries++;
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}
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T * Pop()
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{
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if ( _cEntries )
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{
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_cEntries--;
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}
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return (T *) _Pop();
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}
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T * GetFirst()
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{
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return !IsEmpty() ? (T * ) _root.Next() : 0 ;
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}
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T * GetLast()
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{
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if ( IsEmpty() )
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return 0;
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else
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return (T *) _root.Prev();
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}
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T * GetIth( ULONG i )
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{
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//
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// Return ith entry
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//
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Win4Assert( i < _cEntries );
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CDoubleLink *pLink = _root.Next();
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while ( i != 0 )
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{
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pLink = pLink->Next();
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i--;
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}
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return (T *) pLink;
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}
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T * RemoveLast()
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{
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T * pEntry = 0;
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if ( !IsEmpty() )
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{
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pEntry = (T *) _root.Prev();
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pEntry->Unlink();
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Win4Assert( _cEntries > 0 );
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_cEntries--;
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}
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else
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{
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//
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// NOTE: Some clients of this class may increment, but never decrement
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// this count. This could happen by directly invoking the Unlink
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// method on a list element instead of using the RemoveFromList
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// method which maintains the entry count.
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//
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Win4Assert( _cEntries == 0 );
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}
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return pEntry;
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}
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void RemoveFromList( T * pEntry )
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{
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pEntry->Unlink();
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Win4Assert( _cEntries > 0 );
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_cEntries--;
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}
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void MoveToFront( T * pLink )
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{
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pLink->Unlink();
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_Push( pLink );
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}
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void Clear()
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{
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while ( Count() > 0 )
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{
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T *pLink = Pop();
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delete pLink;
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}
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}
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unsigned Count() const { return _cEntries; }
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private:
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unsigned _cEntries;
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};
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template <class T, class TList>
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class TFwdListIter : public CForwardIter
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{
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public:
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TFwdListIter ( TList & list ) : CForwardIter(list) {}
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T* operator->() { return (T*) _pLinkCur; }
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T* GetEntry() { return (T*) _pLinkCur; }
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};
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template <class T, class TList>
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class TBackListIter : public CBackwardIter
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{
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public:
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TBackListIter ( TList & list ) : CBackwardIter(list) {}
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T* operator->() { return (T*) _pLinkCur; }
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T* GetEntry() { return (T*) _pLinkCur; }
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};
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