A usage example of a C++ template class

This article illustrates the use of template classes in C++, and shares them with you for your reference. Specific methods are as follows:

//#include "StdAfx.h 
#ifndef __AFXTLS_H__ 
#define __AFXTLS_H__ 
#include <Windows.h> 
class CSimpleList 
{ 
public: 
  CSimpleList(int nNextOffset=0); 
  void Construct(int nNextOffset); 
  //interface
  BOOL IsEmpty() const; 
  void AddHead(void *p); 
  void RemoveAll(); 
  void* GetHead() const; 
  void* GetNext(void* preElement) const; 
  BOOL Remove(void* p); 
 
  //The members required to implement the interface
  void  *m_pHead; 
  size_t m_nextOffset; 
  void** GetNextPtr(void* preElement) const; 
}; 
 
//An inline function of a class
inline CSimpleList::CSimpleList(int nNextOffset) 
  {m_pHead = NULL; m_nextOffset = nNextOffset;  } 
 
inline void CSimpleList::Construct(int nNextOffset) 
  {m_nextOffset = nNextOffset;  } 
 
inline BOOL CSimpleList::IsEmpty() const 
{ 
  return m_pHead==NULL; 
} 
//inline void AddHead(void *p) 
//{ 
// 
//} 
inline void CSimpleList::RemoveAll() 
{ 
  m_pHead = NULL; 
} 
inline void* CSimpleList::GetHead() const 
{ 
  return m_pHead; 
} 
inline void* CSimpleList::GetNext(void* preElement) const 
{ 
  return *GetNextPtr(preElement); 
} 
//inline BOOL CSimpleList::Remove(void* p) 
//{ 
// 
//} 
inline void**  CSimpleList::GetNextPtr(void* preElement) const 
{ 
  return (void**)((BYTE*)preElement+m_nextOffset); 
} 
 
 
//Define the template class
template<class TYPE> 
 
class CTypedSimpleList:public CSimpleList 
{ 
public: 
  CTypedSimpleList(int nNextOffset=0) 
    :CSimpleList(nNextOffset){} 
  void Construct(int nNextOffset); 
  //interface
  void AddHead(TYPE p) 
  { 
    CSimpleList::AddHead((void*)p); 
  } 
  TYPE GetHead() 
  { 
    return (TYPE)CSimpleList::GetHead(); 
  } 
  TYPE GetNext(TYPE preElement) 
  { 
    return (TYPE)CSimpleList::GetNext((void*)preElement); 
  } 
  BOOL Remove(TYPE p) 
  { 
    return CSimpleList::Remove(p); 
  } 
   
  //Objects that directly reference classes call this function
  operator TYPE() 
  { 
    return (TYPE)CSimpleList::GetHead(); 
  } 
}; 
#endif 

Usage of template class:

//Test template class
  MyThreadData* pTempData; 
  CTypedSimpleList<MyThreadData*> templateList; 
  list.Construct(offsetof(MyThreadData, pNext)); 
  //Add data to the list
  for (int i=100;i<110;i++) 
  { 
    pTempData = new MyThreadData; 
    pTempData->nShortData = i; 
    templateList.AddHead(pTempData); 
  } 
 
  //Traverses the linked list, freeing the resources occupied by the object
  pTempData = templateList; 
  while (pTempData) 
  { 
    MyThreadData* pNextTempData = pTempData->pNext; 
    printf("TemplateDateList=%dn",pTempData->nShortData); 
    delete pTempData; 
    pTempData = pNextTempData; 
  }

Hope that the article described in the C++ programming to help you.