CComBSTR and const char*

Does  anyone know why atlbase.h doesn't implement the following methods?

#ifndef OLE2ANSI
  /*explicit*/ CComBSTR(LPCSTR pSrc);
  /*explicit*/ CComBSTR(int nSize, LPCSTR sz = NULL);
  CComBSTR& operator=(LPCSTR pSrc);
  void Append(LPCSTR);

In my opinion the value of this class is in these 3 methods and they aren't

Thanx in advance,
Bart S.
Symmetry Technology Labs, Inc.