模板类中定义函数指针

template <class T>
class DICOMMemberCallback : public DICOMCallback
{
public:
typedef  void (T::*TMemberFunctionPointer)(DICOMParser *parser,
doublebyte group,
doublebyte element,
DICOMParser::VRTypes type,
unsigned char* val,
quadbyte len);
...
}

在模板类中定义个函数指针，但那个T::怎么解读呢，求高人指教
[解决办法]
说明T当中有一个
void fun(DICOMParser *parser,
doublebyte group,
doublebyte element,
DICOMParser::VRTypes type,
unsigned char* val,
quadbyte len);
这样的函数