140 lines
2.9 KiB
C++
140 lines
2.9 KiB
C++
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//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1991-1998
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//
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// File: tgrow.hxx
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//
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// Contents: Growable object with a stack-allocated base size
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//
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// Templates: XGrowable
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//
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// Notes: XGrowable is suitable for use with basic types only.
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//
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// History: 19-Feb-97 dlee Created
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// 02-Mar-98 KLam Added Copy method
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//
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//----------------------------------------------------------------------------
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#pragma once
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template <class T, unsigned C = MAX_PATH> class XGrowable
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{
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public:
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XGrowable( unsigned cInit = C ) :
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_pT( _aT ),
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_cT( C )
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{
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Win4Assert( 0 != _cT );
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SetSize( cInit );
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}
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XGrowable( XGrowable<T,C> const & src ) :
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_pT( _aT ),
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_cT( C )
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{
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Win4Assert( 0 != _cT );
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*this = src;
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}
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~XGrowable() { Free(); }
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XGrowable<T,C> & operator =( XGrowable<T,C> const & src )
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{
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Win4Assert( 0 != _cT );
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Copy ( src.Get(), src.Count() );
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return *this;
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}
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T * Copy ( T const * pItem, unsigned cItems, unsigned iStart = 0 )
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{
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// Copies cItems of pItem starting at position iStart
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Win4Assert ( 0 != pItem );
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SetSize ( cItems + iStart );
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RtlCopyMemory ( _pT + iStart, pItem, cItems * sizeof(T) );
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return _pT;
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}
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void Free()
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{
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if ( _pT != _aT )
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{
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delete [] _pT;
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_pT = _aT;
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_cT = C;
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Win4Assert( 0 != _cT );
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}
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}
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T & operator[](unsigned iElem)
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{
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Win4Assert( iElem < _cT );
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return _pT[iElem];
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}
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T const & operator[](unsigned iElem) const
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{
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Win4Assert( iElem < _cT );
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return _pT[iElem];
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}
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T * SetSize( unsigned c )
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{
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Win4Assert( 0 != c );
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if ( c > _cT )
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{
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unsigned cOld = _cT;
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Win4Assert( 0 != _cT );
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do
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{
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_cT *= 2;
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}
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while ( _cT < c );
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T *pTmp = new T [ _cT ];
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RtlCopyMemory( pTmp, _pT, cOld * sizeof T );
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if ( _pT != _aT )
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delete [] _pT;
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_pT = pTmp;
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}
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return _pT;
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}
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void SetSizeInBytes( unsigned cb )
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{
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// round up to the next element size
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SetSize( (cb + sizeof T - 1 ) / sizeof T );
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}
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T * Get() { return _pT; }
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T const * Get() const { return _pT; }
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unsigned Count() const { return _cT; }
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unsigned SizeOf() const { return sizeof T * _cT; }
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void SetBuf( const T* p, unsigned cc )
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{
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Win4Assert( p );
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SetSize( cc );
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RtlCopyMemory( _pT,
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p,
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cc * sizeof( T ) );
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}
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private:
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unsigned _cT;
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T * _pT;
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T _aT[ C ];
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};
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