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136 lines
3.3 KiB
136 lines
3.3 KiB
/*
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* @doc INTERNAL
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*
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* @module DYNARRAY.H -- CDynamicArray class which is used to complement
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* the CLstBxWndHost object.
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*
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* Original Author:
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* Jerry Kim
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*
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* History: <nl>
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* 12/15/97 - v-jerrki Created
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*
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* Copyright (c) 1997-2000 Microsoft Corporation. All rights reserved.
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*/
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#include "_w32sys.h"
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#ifndef __DYNARRAY_H__
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#define __DYNARRAY_H__
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#define DYNARRAY_ARRAY_SIZE 128
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#define DYNARRAY_ARRAY_SLOT 256
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template<class T>
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class CDynamicArray
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{
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protected:
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T* _rg[DYNARRAY_ARRAY_SLOT];
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int _nMax; //indicate maximum valid index
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public:
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static T _sDummy; // dummy struct if invalid index is requested
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public:
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CDynamicArray() : _nMax(0) { memset(_rg, 0, sizeof(T*) * DYNARRAY_ARRAY_SLOT); }
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~CDynamicArray() { Clear(); }
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//==========================================================================
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// Reinitializes the class to its construction state
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//==========================================================================
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void Clear()
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{
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// Start removing all items from the list
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// Start removing items from the list
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for (int i = ((_nMax - 1) / DYNARRAY_ARRAY_SIZE); i >= 0; i--)
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{
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if (_rg[i])
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delete _rg[i];
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}
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_nMax = 0;
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memset(_rg, 0, sizeof(T*) * DYNARRAY_ARRAY_SLOT);
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}
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const T& Get(int i);
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T& operator[](int i);
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};
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//==========================================================================
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// The function returns the requested index. if the requested index is
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// invalid then return dummy variable
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//==========================================================================
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template <class T>
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const T& CDynamicArray<T>::Get(int i)
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{
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// If item is negative or equal to zero, for efficiency reasons,
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// then just return the item in the head of array
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Assert(i >= 0);
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Assert(i < DYNARRAY_ARRAY_SLOT * DYNARRAY_ARRAY_SIZE);
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// Get the number of links we have to travel
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int nSlot = i / DYNARRAY_ARRAY_SIZE;
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int nIdx = i % DYNARRAY_ARRAY_SIZE;
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// That link doesn't exist so just pass dummy struct
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Assert(nSlot < DYNARRAY_ARRAY_SLOT);
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if (i >= _nMax || nSlot >= DYNARRAY_ARRAY_SLOT || _rg[nSlot] == NULL)
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{
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_sDummy._fSelected = 0;
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_sDummy._lparamData = 0;
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_sDummy._uHeight = 0;
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return _sDummy;
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}
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//return value at requested index
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return _rg[nSlot][nIdx];
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}
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//==========================================================================
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// The function will be called if a l-value is requested therefore
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// the index does not necessarily have to be valid
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//==========================================================================
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template <class T>
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T& CDynamicArray<T>::operator[](int i)
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{
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Assert(i >= 0);
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// Get the slot number and index
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int nSlot = i / DYNARRAY_ARRAY_SIZE;
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int nIdx = i % DYNARRAY_ARRAY_SIZE;
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// Check if the slot exists
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Assert(nSlot < DYNARRAY_ARRAY_SLOT);
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if (nSlot >= DYNARRAY_ARRAY_SLOT)
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return _sDummy;
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if (_rg[nSlot] == NULL)
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{
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//Need to allocate memory for this
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T* prg = new T[DYNARRAY_ARRAY_SIZE];
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if (!prg)
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{
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_sDummy._fSelected = 0;
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_sDummy._lparamData = 0;
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_sDummy._uHeight = 0;
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return _sDummy;
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}
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memset(prg, 0, sizeof(T) * DYNARRAY_ARRAY_SIZE);
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_rg[nSlot] = prg;
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if (nSlot >= _nMax / DYNARRAY_ARRAY_SIZE)
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_nMax = (nSlot + 1) * DYNARRAY_ARRAY_SIZE;
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}
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//return value at requested index
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return _rg[nSlot][nIdx];
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}
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#endif //__DYNARRAY_H__
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