Re: LPCTSTR: whats going wrong here?

From:
David Wilkinson <no-reply@effisols.com>
Newsgroups:
microsoft.public.vc.mfc
Date:
Wed, 23 Apr 2008 11:09:52 -0400
Message-ID:
<uY60VQVpIHA.4476@TK2MSFTNGP04.phx.gbl>
..rhavin grobert wrote:

i.e. you need something that properly manages your character data (LPCTSTR),
and CString does a good job about that.


for what reason? all stayes inside the same dll. to abstact it:

we have class A with member CString m_scA and an inline method
inline LPCTSTR A::GetA() {return m_scA;};

we have class B : public A with member CString m_scB and an inline
method
inline LPCTSTR A::GetWhatever(bool fChoose) {
  return ( fChoose ? m_scB : GetA() );
};

...as GetA() is inline this should equal...

inline LPCTSTR A::GetWhatever(bool fChoose) {
  return ( fChoose ? m_scB : m_scA);
};

for what reason do i need a ctor/dtor?


..rhavin:

Because GetA() returns a LPCTSTR, and the type of your ternary expression is a
CString (determined by m_scB).

If you wrote

inline const CString& A::GetA() const {return m_scA;}

then you would have no copying and I think your code would work.

--
David Wilkinson
Visual C++ MVP

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