Re: Can i use CComPtr in CSimplemap?

"Igor Tandetnik" <>
Tue, 16 Dec 2008 18:33:08 -0500
wtller <> wrote:

  and here, CSimpleMap use the newer alloc'd object's address:

  void SetAtIndex(int nIndex, TKey& key, TVal& val)
ATLASSERT(nIndex >= 0 && nIndex < m_nSize);
new(&m_aKey[nIndex]) Wrapper<TKey>(key);

 but CComPtr cannot use it's address if it's member 'p' isn't null

 //The assert on operator& usually indicates a bug. If this is really
//what is needed, however, take the address of the p member
explicitly. T** operator&()
return &p;

Which VC version are you running? In my copy of VC7.1 and VC8,
SetAtIndex (well, actually, InternalSetAtIndex) looks differently:

 void InternalSetAtIndex(int nIndex, const TKey& key, const TVal& val)
  new(m_aKey + nIndex) Wrapper<TKey>(key);
  new(m_aVal + nIndex) Wrapper<TVal>(val);

This neatly bypasses the pitfall of an overloaded operator&. With the
code you show, I'm afraid you are sadly out of luck.
With best wishes,
    Igor Tandetnik

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