C++宏与智能指针技巧

#ifndef WINVER
#define WINVER 0x0500
#endif

#ifndef _WIN32_WINNT
#define _WIN32_WINNT 0x0500
#endif      

#ifndef _WIN32_WINDOWS
#define _WIN32_WINDOWS 0x0500
#endif

#ifndef _WIN32_IE
#define _WIN32_IE 0x0500 
#endif

#ifndef __FILE_LINE__

 #ifndef __STRINGER__
  #define __STRINGER__(x) #x
 #else
  #error "__STRINGER__ has been defined"
 #endif//__STRINGER__

 //1:expand macro value
 //2:value to string
 #ifndef __STR_MACRO__
  #define __STR_MACRO__(x) __STRINGER__(x)
 #else
  #error "__STR_MACRO__ has been defined"
 #endif//__STR_MACRO__

 #define __FILE_LINE__ __FILE__ "("__STR_MACRO__(__LINE__)"):/t"

#endif //__FILE_LINE__
//use example
//#pragma message(__FILE_LINE__"some message")

#ifndef ARRAY_ITEMS
#define ARRAY_ITEMS(array) (sizeof(array)/sizeof(array[0]))
#endif//ARRAY_ITEMS

#ifndef ARRAY_BEGIN
#define ARRAY_BEGIN(array) (&array[0])
#endif//ARRAY_BEGIN

#ifndef ARRAY_END
#define ARRAY_END(array) (ARRAY_BEGIN(array)+ARRAY_ITEMS(array))
#endif//ARRAY_END

#ifndef FIND_ARRAY_ITEM
#include <algorithm>
#define FIND_ARRAY_ITEM(array, value) (std::find(ARRAY_BEGIN(array),ARRAY_END(array),value)-ARRAY_BEGIN(array))
#endif//FIND_ARRAY_ITEM

#ifndef HAS_MASK
#define HAS_MASK(val, mask) (mask==(val&mask))
#endif //HAS_MASK

template<class T>
inline void SafeDelete(T*& p)
{
 if(NULL!=p)
 {
  delete p;
  p = NULL;
 }
}

template<class T>
inline T*& SafeNew(T*& p)
{
 SafeDelete(p);
 p = new T;
 return p;
}

template<class T>
inline void SafeFree(T*& p)
{
 if(NULL!=p)
 {
  free((void*)p);
  p = NULL;
 }
}

template<class T>
inline T*& SafeMalloc(T*& p, unsigned int nSize)
{
 SafeFree(p);
 p = (T*)malloc(nSize);
 return p;
}

 template< class T, eMemType eMT=eNew>
 class CSmartPtr
 {
 private:
  //strange declaretion
  template<class U, eMemType eUMT=eMT> friend class CSmartPtr;

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