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//+---------------------------------------------------------------------------
//
// Microsoft Windows
// Copyright (C) Microsoft Corporation, 1991 - 1992.
//
// File: SET.CXX
//
// Contents: Bit set
//
// Classes: CSimpleSet, CSet
//
// History: 01-Nov-91 BartoszM Created.
//
//----------------------------------------------------------------------------
#include <pch.cxx>
#pragma hdrstop
#include "set.hxx"
//
// CSimpleSet
//
//
// LowestBit [x] = position of lowest bit in byte x
// EOS if set exhaused.
//
#define EMPTY 16
// 0 1 2 3 4 5 6 7 8 9 a b c d e f
static const char LowestBit[] = {EMPTY, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 6, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 7, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 6, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0};
//+---------------------------------------------------------------------------
//
// Member: CSimpleSet::FirstElement, public
//
// Synopsis: Returns the first element in the set
//
// History: 01-Nov-91 BartoszM Created.
//
//----------------------------------------------------------------------------
int CSimpleSet::FirstElement() const{ unsigned char* pb = (unsigned char*) &_bitset; for ( unsigned i = 0; i < sizeof ( set_t ); i++ ) { if ( pb[i] != 0 ) return LowestBit [ pb[i] ] + i * 8; } return EOS;}
//
// CSet
//
//+---------------------------------------------------------------------------
//
// Member: CSet::CSet, public
//
// Synopsis: Copy constructor
//
// Arguments: [s] -- source set
//
// History: 01-Nov-91 BartoszM Created.
//
//----------------------------------------------------------------------------
CSet::CSet ( CSet& s ){ memcpy ( _aSimpleSet, s._aSimpleSet, sizeof _aSimpleSet );}
//+---------------------------------------------------------------------------
//
// Member: CSet:operator=, public
//
// History: 01-Nov-91 BartoszM Created.
//
//----------------------------------------------------------------------------
CSet& CSet::operator= ( CSet& s ){ memcpy ( _aSimpleSet, s._aSimpleSet, sizeof _aSimpleSet ); return *this;}
//+---------------------------------------------------------------------------
//
// Member: CSet::IsEmpty, public
//
// Synopsis: Checks if the set is empty
//
// History: 01-Nov-91 BartoszM Created.
//
//----------------------------------------------------------------------------
BOOL CSet::IsEmpty() const{ for ( int i = 0; i < SET_ENTRIES; i++ ) { if ( ! _aSimpleSet[i].IsEmpty() ) return FALSE; } return TRUE;}
//+---------------------------------------------------------------------------
//
// Member: CSet::FirstElement, public
//
// Synopsis: Returns the first element
//
// History: 01-Nov-91 BartoszM Created.
//
//----------------------------------------------------------------------------
int CSet::FirstElement() const{ int i = 0;
while ( _aSimpleSet[i].IsEmpty() ) { if ( ++i == SET_ENTRIES ) return EOS; } return i * SIMPLE_SET_SIZE + _aSimpleSet[i].FirstElement();}
//+---------------------------------------------------------------------------
//
// Member: CSet::Clear, public
//
// Synopsis: Removes all elements from set
//
// History: 01-Nov-91 BartoszM Created.
//
//----------------------------------------------------------------------------
void CSet::Clear(){ for ( int i = 0; i < SET_ENTRIES; i++ ) _aSimpleSet[i].Clear();}
//+---------------------------------------------------------------------------
//
// Member: CSet::Fill, public
//
// Synopsis: Fill the set
//
// History: 01-Nov-91 BartoszM Created.
//
//----------------------------------------------------------------------------
void CSet::Fill(){ for ( int i = 0; i < SET_ENTRIES; i++ ) _aSimpleSet[i].Fill();}
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