Re: CString ... are 'they' nuts?

From:
"AliR \(VC++ MVP\)" <AliR@online.nospam>
Newsgroups:
microsoft.public.vc.mfc
Date:
Thu, 5 Feb 2009 14:07:56 -0600
Message-ID:
<aMHil.10256$pr6.753@flpi149.ffdc.sbc.com>
Why didn't you just make your operator overload take a UINT?

// the only real overload, we need to check for ResourceID
const CQString& operator=(UINT ResourceID);


That way you have yours that takes a resource ID, and CString has his own
that takes a LPCTSTR.

And also you won't have to cast your resource ID into a LPCTSTR when you
want to use the assignment operator.

Ali

".rhavin grobert" <clqrq@yahoo.de> wrote in message
news:741e8083-bb60-485d-92d3-48ee756ad64b@s9g2000prg.googlegroups.com...

On 4 Feb., 18:13, ".rhavin grobert" <cl...@yahoo.de> wrote:

that leads me to the question: can i derive from CString if the only
thing i do is overload the operator=()...


My solution...

//-----------------------------------------------------------------------------
class CQString : public CString
{
public:
// overloaded contructors refer to baseclass
inline CQString() {};
inline CQString(const CString& stringSrc) : CString(stringSrc) {};
inline CQString(LPCTSTR lpsz) : CString(lpsz) {};

 #ifdef _UNICODE
inline CQString(LPCSTR lpsz) : CString(lpsz) {};
 #else
inline CQString(LPCWSTR lpsz) : CString(lpsz) {};
 #endif

// additional constructor for resource-id's
inline CQString(UINT nRscID) {LoadString(nRscID);};

// destructor does nothing
virtual inline ~CQString() {};

// the only real overload, we need to check for ResourceID
const CQString& operator=(LPCTSTR lpsz);
};

//-----------------------------------------------------------------------------
// the only real overload, we need to check for ResourceID
const CQString& CQString::operator=(LPCTSTR lpsz)
{
if (lpsz != NULL && HIWORD(lpsz) == NULL)
{
UINT nID = LOWORD((DWORD)lpsz);
if (!LoadString(nID))
TRACE1("Warning: implicit LoadString(%u) failed\n", nID);
return *this;
}
ASSERT(lpsz == NULL || AfxIsValidString(lpsz));
AssignCopy(SafeStrlen(lpsz), lpsz);
return *this;
}

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