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67 lines
1.4 KiB
67 lines
1.4 KiB
//+---------------------------------------------------------------------------
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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: ANDNCUR.HXX
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//
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// Contents: And Not cursor
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//
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// Classes: CAndNotCursor
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//
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// History: 22-Apr-92 AmyA Created.
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//
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//----------------------------------------------------------------------------
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#pragma once
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#ifdef DISPLAY_INCLUDES
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#pragma message( "#include <" __FILE__ ">..." )
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#endif
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#include <cursor.hxx>
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//+---------------------------------------------------------------------------
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//
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// Class: CAndNotCursor
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//
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// Purpose: Boolean And Not cursor (find documents that contain the first
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// key but not the second). Works with a single index.
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//
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// History: 22-Apr-92 AmyA Created.
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//
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//----------------------------------------------------------------------------
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class CAndNotCursor : INHERIT_VIRTUAL_UNWIND, public CCursor
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{
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DECLARE_UNWIND
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public:
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CAndNotCursor ( XCursor & curSource, XCursor & curFilter );
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virtual ~CAndNotCursor();
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WORKID WorkId();
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WORKID NextWorkId();
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ULONG HitCount();
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LONG Rank();
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LONG Hit();
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LONG NextHit();
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void RatioFinished ( ULONG& denom, ULONG& num );
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protected:
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void FindDisjunction();
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WORKID _wid;
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XCursor _curSource;
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XCursor _curFilter;
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};
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