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Jean-Marc Bourguet
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 Posted: Sat Oct 02, 2004 4:55 am Post subject: cast |
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In the following code
struct C {
operator char const*() const;
};
void f(char*);
void g(C x) {
f((char*)(x));
f(const_cast<char*>(static_cast<char const*>(x)));
}
Comeau 4.3.3 (web interface), Sun C++ 5.5 Patch 113817-06
2004/01/29 and g++ 3.4.2 all complain about the "C cast".
My reading of 5.4/5 seems to indicate that they should not. Usually
when all the compilers agree against my understanding of the standard,
they are correct, so I wonder what clause did I misread or forget.
Yours,
--
Jean-Marc
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Tom Widmer
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| Posted: Tue Oct 05, 2004 3:26 pm Post subject: Re: cast |
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On Sat, 2 Oct 2004 04:55:02 GMT, [email]jm (AT) bourguet (DOT) org[/email] (Jean-Marc Bourguet)
wrote:
| Quote: |
In the following code
struct C {
operator char const*() const;
};
void f(char*);
void g(C x) {
f((char*)(x));
f(const_cast<char*>(static_cast<char const*>(x)));
}
Comeau 4.3.3 (web interface), Sun C++ 5.5 Patch 113817-06
2004/01/29 and g++ 3.4.2 all complain about the "C cast".
My reading of 5.4/5 seems to indicate that they should not. Usually
when all the compilers agree against my understanding of the standard,
they are correct, so I wonder what clause did I misread or forget.
|
I think the relevent clause is 13.3.1.5/1. Basically, operator char
const* is not considered a viable function when the target is char*,
since char const* cannot be converted to char* via a standard
conversion sequence.
Tom
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[ comp.std.c++ is moderated. To submit articles, try just posting with ]
[ your news-reader. If that fails, use mailto:std-c++@ncar.ucar.edu ]
[ --- Please see the FAQ before posting. --- ]
[ FAQ: http://www.jamesd.demon.co.uk/csc/faq.html ]
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