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Array3d.h
Package: display_list.zip [view]
Upload User: hcfgz168
Upload Date: 2011-09-11
Package Size: 116k
Code Size: 5k
Category:
OpenGL program
Development Platform:
WINDOWS
- //********************************************
- // Array3d.h
- // class CArray3d :
- //********************************************
- // Careful : this array stores pointers
- // on elements, but does not free memory
- // in destructors, you must call array.Free()
- // to do this.
- //********************************************
- // pierre.alliez@cnet.francetelecom.fr
- // Created : 30/01/98
- // Modified : 18/02/98
- //********************************************
- #ifndef _ARRAY_3D_
- #define _ARRAY_3D_
- template<class T>
- class CArray3d
- {
- // Implementation
- private:
- T** m_pData; // the actual array of data
- int m_nSize; // # of elements (upperBound - 1)
- int m_nMaxSize; // max allocated
- int m_nGrowBy; // grow amount
- public:
- // Construction
- CArray3d()
- {
- m_pData = NULL;
- m_nSize = 0;
- m_nMaxSize = 0;
- m_nGrowBy = 0;
- }
- // Destruction
- ~CArray3d()
- {
- delete [] (BYTE*)m_pData;
- }
- // Attributes
- int GetSize() { return m_nSize; }
- int GetUpperBound() { return m_nSize-1; }
- // Operations
- // Really clean up
- void Free()
- {
- for(int i=0;i<m_nSize;i++)
- if(m_pData[i] != NULL)
- {
- delete m_pData[i];
- m_pData[i] = NULL;
- }
- RemoveAll();
- }
- // Clean up pointers array
- void FreeExtra();
- // Clean up pointers array
- void RemoveAll() { SetSize(0); }
- // Accessing elements
- T* GetAt(int nIndex)
- {
- ASSERT(nIndex >= 0 && nIndex < m_nSize);
- return m_pData[nIndex];
- }
- // SetAt
- void SetAt(int nIndex, T* newElement)
- {
- ASSERT(nIndex >= 0 && nIndex < m_nSize);
- m_pData[nIndex] = newElement;
- }
- // Has
- int Has(T* pElement)
- {
- int size = GetSize();
- for(int i=0;i<size;i++)
- if(GetAt(i) == pElement)
- return 1;
- return 0;
- }
- // Direct Access to the element data (may return NULL)
- T** GetData() { return m_pData; }
- // Add
- int Add(T* newElement)
- {
- int nIndex = m_nSize;
- SetAtGrow(nIndex, newElement);
- return nIndex;
- }
- // overloaded operator helpers
- T* operator[](int nIndex) { return GetAt(nIndex); }
- // Potentially growing the array
- void SetAtGrow(int nIndex, T* newElement)
- {
- ASSERT(nIndex >= 0);
- if (nIndex >= m_nSize)
- SetSize(nIndex+1);
- m_pData[nIndex] = newElement;
- }
- // Operations that move elements around
- void InsertAt(int nIndex, T* newElement, int nCount = 1)
- {
- ASSERT(nIndex >= 0); // will expand to meet need
- ASSERT(nCount > 0); // zero or negative size not allowed
- if (nIndex >= m_nSize)
- {
- // adding after the end of the array
- SetSize(nIndex + nCount); // grow so nIndex is valid
- }
- else
- {
- // inserting in the middle of the array
- int nOldSize = m_nSize;
- SetSize(m_nSize + nCount); // grow it to new size
- // shift old data up to fill gap
- memmove(&m_pData[nIndex+nCount], &m_pData[nIndex],
- (nOldSize-nIndex) * sizeof(T*));
- // re-init slots we copied from
- memset(&m_pData[nIndex], 0, nCount * sizeof(T*));
- }
- // insert new value in the gap
- ASSERT(nIndex + nCount <= m_nSize);
- while (nCount--)
- m_pData[nIndex++] = newElement;
- }
- void RemoveAt(int nIndex, int nCount = 1)
- {
- ASSERT(nIndex >= 0);
- ASSERT(nCount >= 0);
- ASSERT(nIndex + nCount <= m_nSize);
- // just remove a range
- int nMoveCount = m_nSize - (nIndex + nCount);
- if (nMoveCount)
- memcpy(&m_pData[nIndex], &m_pData[nIndex + nCount],
- nMoveCount * sizeof(T*));
- m_nSize -= nCount;
- }
- // IndexFrom
- int IndexFrom(T* pElement)
- {
- for(int i=0;i<m_nSize;i++)
- if(m_pData[i] == pElement)
- return i;
- TRACE("IndexFrom : no elementn");
- return -1;
- }
- // SetSize
- void SetSize(int nNewSize, int nGrowBy = -1)
- {
- ASSERT(nNewSize >= 0);
- if(nGrowBy != -1)
- m_nGrowBy = nGrowBy; // set new size
- // shrink to nothing
- if(nNewSize == 0)
- {
- delete[] (BYTE*)m_pData;
- m_pData = NULL;
- m_nSize = 0;
- m_nMaxSize = 0;
- }
- else
- // create one with exact size
- if(m_pData == NULL)
- {
- m_pData = (T**) new BYTE[nNewSize * sizeof(T*)];
- memset(m_pData, 0, nNewSize * sizeof(T*)); // zero fill
- m_nSize = nNewSize;
- m_nMaxSize = nNewSize;
- }
- else
- if(nNewSize <= m_nMaxSize)
- {
- // it fits
- if (nNewSize > m_nSize)
- {
- // initialize the new elements
- memset(&m_pData[m_nSize], 0, (nNewSize-m_nSize) * sizeof(T*));
- }
- m_nSize = nNewSize;
- }
- else
- {
- // otherwise, grow array
- int nGrowBy = m_nGrowBy;
- if (nGrowBy == 0)
- {
- // heuristically determine growth when nGrowBy == 0
- // (this avoids heap fragmentation in many situations)
- nGrowBy = min(1024, max(4, m_nSize / 8));
- }
- int nNewMax;
- if (nNewSize < m_nMaxSize + nGrowBy)
- nNewMax = m_nMaxSize + nGrowBy; // granularity
- else
- nNewMax = nNewSize; // no slush
- ASSERT(nNewMax >= m_nMaxSize); // no wrap around
- T** pNewData = (T**) new BYTE[nNewMax * sizeof(T*)];
- // copy new data from old
- memcpy(pNewData, m_pData, m_nSize * sizeof(T*));
- // construct remaining elements
- ASSERT(nNewSize > m_nSize);
- memset(&pNewData[m_nSize], 0, (nNewSize-m_nSize) * sizeof(T*));
- // get rid of old stuff (note: no destructors called)
- delete[] (BYTE*)m_pData;
- m_pData = pNewData;
- m_nSize = nNewSize;
- m_nMaxSize = nNewMax;
- }
- }
- };
- #endif // _ARRAY_3D_