102 lines
2.4 KiB
C
102 lines
2.4 KiB
C
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//+-------------------------------------------------------------------------
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//
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// Microsoft Windows
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//
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// Copyright (C) Microsoft Corporation, 1997 - 1997
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//
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// File: glnkenum.h
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//
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//--------------------------------------------------------------------------
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//
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// GLNKENUM.H
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//
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#if !defined(_GLNKENUM_H_)
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#define _GLNKENUM_H_
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// Base class for generic linkable object enumerators
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class GLNKENUM_BASE
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{
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public:
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// Construct an enumerator.
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GLNKENUM_BASE ( const GLNKEL & lnkel, int iDir = 1 )
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{
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Reset( lnkel, iDir ) ;
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}
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// Position to the next pointer
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GLNKEL * PlnkelNext () ;
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// Return the current object pointer
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inline GLNKEL * PlnkelCurrent()
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{ return _plnkelNext ; }
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// Set the enumerator to have a new base
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void Reset ( const GLNKEL & lnkel, int iDir = 0 )
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{
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_plnkelStart = const_cast<GLNKEL *>(& lnkel) ;
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_plnkelNext = NULL ;
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if ( iDir >= 0 )
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_iDir = iDir ;
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}
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protected:
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GLNKEL * _plnkelStart ;
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GLNKEL * _plnkelNext ;
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int _iDir ; // Enumeration direction
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};
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#define BOOL_CROSS_PRODUCT(a,b) (((a) > 0) + (((b) > 0) * 2))
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inline
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GLNKEL * GLNKENUM_BASE :: PlnkelNext ()
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{
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GLNKEL * plnkelResult = NULL ;
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switch ( BOOL_CROSS_PRODUCT( _plnkelNext != NULL, _iDir ) )
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{
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case BOOL_CROSS_PRODUCT( true, true ):
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if ( _plnkelNext->PlnkelNext() != _plnkelStart )
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plnkelResult =_plnkelNext = _plnkelNext->PlnkelNext() ;
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break ;
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case BOOL_CROSS_PRODUCT( true, false ):
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if ( _plnkelNext != _plnkelStart )
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plnkelResult = _plnkelNext = _plnkelNext->PlnkelPrev() ;
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break ;
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case BOOL_CROSS_PRODUCT( false, true ):
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plnkelResult = _plnkelNext = _plnkelStart ;
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break ;
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case BOOL_CROSS_PRODUCT( false, false ):
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plnkelResult = _plnkelNext = _plnkelStart->PlnkelPrev() ;
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break ;
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}
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return plnkelResult ;
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}
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template <class L, bool bAnchor>
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class GLNKENUM : public GLNKENUM_BASE
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{
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public:
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// Construct an enumerator. If 'bAnchor', then the anchor object is
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// skipped during enumeration.
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GLNKENUM ( const L & lnkel, bool bIsAnchor = bAnchor, int iDir = 1 )
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: GLNKENUM_BASE( lnkel, iDir )
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{
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if ( bIsAnchor )
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PlnkelNext() ;
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}
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// Position to the next pointer
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L * PlnkelNext ()
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{ return (L *) GLNKENUM_BASE::PlnkelNext() ; }
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// Return the current object pointer
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L * PlnkelCurrent()
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{ return (L *) _plnkelNext ; }
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// Set the enumerator to have a new base
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void Reset ( const L & lnkel, int iDir = -1 )
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{ GLNKENUM_BASE::Reset( lnkel, iDir ) ; }
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};
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#endif
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