📄 sortable_cobarray.shtml.htm

📁 mfc资料集合5
💻 HTM
字号:
<HTML>
<HEAD>
   <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
   <META NAME="Author" CONTENT="Zafir Anjum">
   <TITLE>C++ & MFC - Sortable CObArray class</TITLE>
</HEAD>
<body background="../fancyhome/back.gif" tppabs="http://www.codeguru.com/fancyhome/back.gif" bgcolor="#FFFFFF" link="#B50029" vlink="#8E2323" alink="#FF0000">
<table WIDTH="100%">
<tr WIDTH="100%">
<td><td>
</tr>
</table>


<CENTER>
<H3>
<FONT COLOR="#AOAO99">Sortable CObArray class</FONT></H3></CENTER>

<CENTER>
<H3>

<HR></H3></CENTER>

<p>This article was contributed by <A HREF="mailto:douglas.peterson@telex.com">Douglas Peterson</A>.

<PRE><TT>
<FONT COLOR="#990000">
// <B>SortableObArray.h</B>
/////////////////////////////////////////////////////////////////////

class CSortableObArray : public CObArray
{
public:
	void Sort(int(*CompareFunc)(CObject* pFirst, CObject* pSecond));
	void Sort(int iStartPos, int iElements, int(*CompareFunc)(CObject* pFirst, CObject* pSecond));
};


template< class TYPE >
class CTypedSortableObArray : public CSortableObArray
{
public:
	// Accessing elements
	TYPE GetAt(int nIndex) const
	{ return (TYPE)CSortableObArray::GetAt(nIndex); }
	TYPE& ElementAt(int nIndex)
	{ return (TYPE&)CSortableObArray::ElementAt(nIndex); }
	void SetAt(int nIndex, TYPE ptr)
	{ CSortableObArray::SetAt(nIndex, ptr); }
	
	// Potentially growing the array
	void SetAtGrow(int nIndex, TYPE newElement)
	{ CSortableObArray::SetAtGrow(nIndex, newElement); }
	int Add(TYPE newElement)
	{ return CSortableObArray::Add(newElement); }
	int Append(const CTypedPtrArray< CSortableObArray, TYPE >& src)
	{ return CSortableObArray::Append(src); }
	void Copy(const CTypedPtrArray< CSortableObArray, TYPE >& src)
	{ CSortableObArray::Copy(src); }
	
	// Operations that move elements around
	void InsertAt(int nIndex, TYPE newElement, int nCount = 1)
	{ CSortableObArray::InsertAt(nIndex, newElement, nCount); }
	void InsertAt(int nStartIndex, CTypedSortableObArray< TYPE >* pNewArray)
	{ CSortableObArray::InsertAt(nStartIndex, pNewArray); }
	
	// overloaded operator helpers
	TYPE operator[](int nIndex) const
	{ return (TYPE)CSortableObArray::operator[](nIndex); }
	TYPE& operator[](int nIndex)
	{ return (TYPE&)CSortableObArray::operator[](nIndex); }
	
	void Sort( int(*CompareFunc)(TYPE pFirstObj, TYPE pSecondObj) )
	{ CSortableObArray::Sort((int(*)(CObject*,CObject*))CompareFunc); }
	void Sort( int iStartPos, int iElements, int(*CompareFunc)(TYPE pFirstObj, TYPE pSecondObj) )
	{ CSortableObArray::Sort(iStartPos, iElements, (int(*)(CObject*,CObject*))CompareFunc); }
};



// <B>SortableObArray.cpp</B>
///////////////////////////////////////////////////////////////////

#define STRIDE_FACTOR 3

void CSortableObArray::Sort(int(*CompareFunc)(CObject* pFirst, CObject* pSecond))
{
	// CompareFunc is expected to return a positive integer if pFirstObj
	// should follow pSecondObj (is greater than)
	
	// Uses Shell Sort
	
	// Basically it does a bunch of smaller insertion sorts than insertion sorts the
	//  whole thing.  Insertion sorting is much faster on a list that is already
	//  mostly sorted.
	
	// ** NOTE:  Because GetSize() is called to retrieve the number of elements, you should
	//            call SetSize() with the number of valid elements.  An alternative is
	//            shown in the sort function below.
	
	ASSERT_VALID(this);
	
	BOOL bFound;
	int iElements = GetSize();
	int iInner,iOuter,iStride = 1;
	CObject *pTmp;
	
	while (iStride <= iElements)
		iStride = iStride * STRIDE_FACTOR + 1;
	
	while (iStride > (STRIDE_FACTOR - 1))
	{
		iStride = iStride / STRIDE_FACTOR;
		for (iOuter = iStride; iOuter < iElements; iOuter++)
		{
			bFound = 0;
			iInner = iOuter - iStride;
			while ((iInner >= 0) && !bFound)
			{
				if (CompareFunc(m_pData[iInner+iStride],m_pData[iInner]) < 0)
				{
					pTmp = m_pData[iInner+iStride];
					m_pData[iInner+iStride] = m_pData[iInner];
					m_pData[iInner] = pTmp;
					iInner -= iStride;
				}
				else
					bFound = 1;
			}
		}
	}
}

void CSortableObArray::Sort(int iStartPos, int iElements, int(*CompareFunc)(CObject* pFirst, CObject* pSecond))
{
	// This variation allows you to sort only a portion of the array
	
	ASSERT_VALID(this);
	ASSERT( iStartPos >= 0 && iStartPos <= GetUpperBound() );
	ASSERT( GetSize() - iStartPos >= iElements );
	
	BOOL bFound;
	int iInner,iOuter,iStride = 1;
	CObject *pTmp;
	CObject **pData = &m_pData[iStartPos];
	
	while (iStride <= iElements)
		iStride = iStride * STRIDE_FACTOR + 1;
	
	while (iStride > (STRIDE_FACTOR - 1))
	{
		iStride = iStride / STRIDE_FACTOR;
		for (iOuter = iStride; iOuter < iElements; iOuter++)
		{
			bFound = 0;
			iInner = iOuter - iStride;
			while ((iInner >= 0) && !bFound)
			{
				if (CompareFunc(pData[iInner+iStride],pData[iInner]) < 0)
				{
					pTmp = pData[iInner+iStride];
					pData[iInner+iStride] = pData[iInner];
					pData[iInner] = pTmp;
					iInner -= iStride;
				}
				else
					bFound = 1;
			}
		}
	}
}
</FONT><FONT COLOR="#000000">


// <B>Usage</B>
//////////////////////////////////////////////////////////

// Create a CObject based class
class CMyObject : public CObject
{
public:
	CString name;
	static int CompBackward(CObject* pFirstObj, CObject* pSecondObj)
	{
		return -lstrcmp(((CMyObject*)pFirstObj)->name,((CMyObject*)pSecondObj)->name);
	}
};

// Create an array object
CTypedSortableObArray< CMyObject* > array;

array.SetSize(10);

// Fill the array with a bunch of objects
for (int i=0; i < 10; i++)
{
	CMyObject * pObj = new CMyObject;
	pObj->name.Format("Object #%d",i);
	array[i] = pObj;
}

// Sort the array
array.Sort(CMyObject::CompBackward);

// Display the contents of the now sorted array
for (int i=0; i < 10; i++)
{
	TRACE1("%s\n",array[i]->name);
}


</FONT></TT></PRE>
<P>
<HR>
<TABLE BORDER=0 WIDTH="100%" >
<TR>
<TD WIDTH="33%"><FONT SIZE=-1><A HREF="../index.htm" tppabs="http://www.codeguru.com/">Goto
HomePage</A></FONT></TD>

<TD WIDTH="33%">
<CENTER><FONT SIZE=-2>&copy; 1997 Zafir Anjum</FONT>&nbsp;</CENTER>
</TD>

<TD WIDTH="34%">
<DIV ALIGN=right><FONT SIZE=-1>Contact me: <A
HREF="mailto:zafir@home.com">zafir@home.com</A>&nbsp;</FONT></DIV>
</TD>
</TR>
</TABLE>
<CENTER><FONT SIZE=-2>8350</FONT></CENTER>
</BODY>
</HTML>
⌨️ 快捷键说明

复制代码 Ctrl + C
搜索代码 Ctrl + F
全屏模式 F11
切换主题 Ctrl + Shift + D
显示快捷键 ?
增大字号 Ctrl + =
减小字号 Ctrl + -