83 lines
1.7 KiB
C++
83 lines
1.7 KiB
C++
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//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1991 - 1992.
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//
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// File: MCURSOR.HXX
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//
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// Contents: Merge Cursor
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//
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// Classes: CMergeCursor
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//
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// History: 06-May-91 BarotszM Created.
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//
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//----------------------------------------------------------------------------
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#pragma once
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#include <keycur.hxx>
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#include "kcurheap.hxx"
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class CKeyCurStack;
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//+---------------------------------------------------------------------------
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//
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// Class: CMergeCursor
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//
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// Purpose: Merge cursor, merges several cursors into one ordered cursor
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// The cursors come from different indexes. The call to
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// NextWorkId may return the same wid, changing only index id.
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//
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// History: 06-May-91 BartoszM Created.
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// 27-Feb-92 AmyA Added HitCount
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//
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//----------------------------------------------------------------------------
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class CMergeCursor: public CKeyCursor
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{
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public:
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CMergeCursor( CKeyCurStack & stkCursor );
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~CMergeCursor() {} // heaps are deleted
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const CKeyBuf * GetKey();
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const CKeyBuf * GetNextKey();
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WORKID WorkId();
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WORKID NextWorkId();
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OCCURRENCE Occurrence();
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OCCURRENCE NextOccurrence();
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ULONG OccurrenceCount();
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OCCURRENCE MaxOccurrence();
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ULONG WorkIdCount();
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ULONG HitCount();
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void RatioFinished ( ULONG& denom, ULONG& num )
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{
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Win4Assert ( !"RatioFinished called on CMergeCursor\n" );
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}
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void FreeStream();
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void RefillStream();
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protected:
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BOOL ReplenishWid();
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CKeyHeap _keyHeap;
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CIdxWidHeap _widHeap;
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};
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