75 lines
1.7 KiB
C++
75 lines
1.7 KiB
C++
//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1995.
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//
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// File: RowComp.hxx
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//
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// Contents: Compares two rows.
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//
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// Classes: CRowComparator
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//
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// History: 05-Jun-95 KyleP Created
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//
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//----------------------------------------------------------------------------
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#pragma once
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#include <compare.hxx>
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//+---------------------------------------------------------------------------
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//
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// Class: CRowComparator
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//
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// Purpose: Compares two rows.
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//
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// History: 05-Jun-95 KyleP Created.
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//
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//----------------------------------------------------------------------------
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class CRowComparator
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{
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public:
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CRowComparator();
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~CRowComparator();
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unsigned Init( CSort const & sort,
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DBBINDING * aBinding,
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DBCOLUMNINFO const * aColumnInfo,
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DBORDINAL cColumnInfo );
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BOOL IsLT( BYTE * pbRow1,
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ULONG cbRow1,
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int IndexRow1,
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BYTE * pbRow2,
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ULONG cbRow2,
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int IndexRow2 );
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private:
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//
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// Holds length and status codes for sort columns. Used in buffer
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// managed by row cache.
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//
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struct SColumnStatus
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{
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DBROWSTATUS Status;
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DBLENGTH Length;
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};
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unsigned * _aoColumn; // Offset of each column in _pbRow1, _pbRow2.
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//
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// Comparison fields.
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//
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unsigned _cColumn; // Count of columns.
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FDBCmp * _aCmp; // Comparators. One per column.
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int * _aDir; // 1 for ascending, -1 for descending.
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};
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