-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Paul Eggert wrote: > Bruno Haible <[EMAIL PROTECTED]> writes: > >> Compilers such as Sun C++ really define NULL to 0 >> (in both C and C++ mode!), and misinterpret NULL in varargs and sizeof. > > The problem with varargs is one that has bitten me personally. Ouch! > > But "sizeof (NULL)" is a new one on me. As near as I can make out, > that expression can yield any nonnegative value, as far as the C > standard is concerned. I'd be mildly surprised to find any useful, > portable code that contains "sizeof (NULL)"; normally I would think > "bug" if I saw such an expression. > > This is a trivial point by itself, but I'm raising it since I'm a bit > worried that I am missing something nontrivial here.
I'm pretty sure that Bruno was using "sizeof (NULL)" to demonstrate that GNU C++ manages to use a special 0-valued constant that is (presumably) compatible with pointer-types, while not actually _having_ a pointer type (or, at least, not requiring a cast). I don't think anyone was suggesting that "sizeof (NULL)" be actually used anywhere. :) - -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFHE9497M8hyUobTrERCGY6AJ45nSyE3y1g7bK6INLGvPdjhbNKcgCfZ8GO b40144Y29KqFzvXVaLatQ8w= =dG2Q -----END PGP SIGNATURE-----
