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QuickSort enabled CArray template class

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16 Mar 2000 156.7K   3.2K   30  
A CArray derived class that provides quick and convenient sorting
/********************************************************************************************
* MOD-NAME      : QArray.h
* LONG-NAME     : QuickSort algorithm enabled CArray
*
* AUTHOR        : Martin Ziacek, Martin.Ziacek@swh.sk, http://www.swh.sk
* COPYRIGHT     : 1999 Martin Ziacek
* DEPARTMENT    : SWH s.r.o
* TELEPHONE     : +421 7 59684147
* CREATION-DATE : 1.5.1999 8:27:23
* SP-NO         : 
* FUNCTION      : Implementation of QuickSort algorithm as template for array class
*                 and template for simple function QuickSort()
* 
*********************************************************************************************/

#ifndef _QuickSortCArrayAndFunctionTemplate_7EB8E364_1A47_11d3_AFD1_0080ADB99E81_
#define _QuickSortCArrayAndFunctionTemplate_7EB8E364_1A47_11d3_AFD1_0080ADB99E81_

//////////////////////////////////////////////////////////////////////////
// QuickSort functions
//////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////////
// QuickSortRecursive - core of algorithm, do not call it, use QuickSort,
// see below
template <class T> void QuickSortRecursive(T *pArr, int d, int h, BOOL bAscending)
{
	int i,j;
	T str;

	i = h;
	j = d;

	str = pArr[((int) ((d+h) / 2))];

	do {

		if (bAscending) {
			while (pArr[j] < str) j++;
			while (pArr[i] > str) i--;
		} else {
			while (pArr[j] > str) j++;
			while (pArr[i] < str) i--;
		}

		if ( i >= j ) {

			if ( i != j ) {
				T zal;

				zal = pArr[i];
				pArr[i] = pArr[j];
				pArr[j] = zal;

			}

			i--;
			j++;
		}
	} while (j <= i);

	if (d < i) QuickSortRecursive(pArr,d,i,bAscending);
	if (j < h) QuickSortRecursive(pArr,j,h,bAscending);
}

//////////////////////////////////////////////////////////////////////////
// QuickSort - entry to algorithm
//
// T *pArr			... pointer of array to sort
// int iSize		... size of array T *pArr
// BOOL bAscending	... if bAscending == TRUE, then sort ascending,
//						otherwise descending
//
// return TRUE if no error, error can be bad parameter, call ::GetLastError()
// if QuickSort returned FALSE
template <class T> BOOL QuickSort(T *pArr, int iSize, BOOL bAscending = TRUE)
{
	BOOL rc = TRUE;

	if (iSize > 1) {

		try {

			int	low = 0,
				high = iSize - 1;

			QuickSortRecursive(pArr,low,high,bAscending);

		} catch (...) {
			::SetLastError(ERROR_INVALID_PARAMETER);
			rc = FALSE;
		}

	} else {
		::SetLastError(ERROR_INVALID_PARAMETER);
		rc = FALSE;
	}

	return rc;
}

//////////////////////////////////////////////////////////////////////////
// CQArray
//////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////////
// CQArray declaration

template <class T, class PT> class CQArray : public CArray <T, PT>
{
public:
	void QuickSort(BOOL bAscending = TRUE);
};

//////////////////////////////////////////////////////////////////////////
// CQArray implementation

//////////////////////////////////////////////////////////////////////////
// QuickSort - entry to algorithm
//
// BOOL bAscending	... if bAscending == TRUE, then sort ascending, 
//						otherwise descending
//
template <class T, class TP> void CQArray<T,TP>::QuickSort(BOOL bAscending/* = TRUE*/)
{
	if (GetSize() > 1) {
		::QuickSort(GetData(),GetSize(),bAscending);
	}
}

#endif /* _QuickSortCArrayAndFunctionTemplate_7EB8E364_1A47_11d3_AFD1_0080ADB99E81_ */

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