From: Howard Hinnant (hinnant_at_[hidden])
Date: 2005-05-10 14:23:26
On May 10, 2005, at 5:41 AM, Gennaro Prota wrote:
> --- Doug Gregor <dgregor_at_[hidden]> wrote:
>> The stream extraction operators for dynamic_bitset are failing on
>> CodeWarrior 9.4. See: http://tinyurl.com/addko
>> Is anyone familiar enough with the quirks of Metrowerks' iostreams to
>> fix this issue?
>
> Hi Doug, Jeremy and Howard
>
> unfortunately, due to a series of vicissitudes that would be too long
> to tell,
> I have no home connection at the moment (a situation that lasts from
> several
> months) and thus I can't work on CVS. Howard Hinnant is probably the
> person who
> knows Metrowerks compiler and library best. Howard?
This is preliminary, but I'm currently thinking this is compiler error.
The following local array:
std::string strings[] = {
// NOTE: "const" gives the usual problems with Borland
// (in Tests::stream_extractor instantiation)
#if !(defined __BORLANDC__ \
&& BOOST_WORKAROUND(BOOST_RWSTD_VER, BOOST_TESTED_AT(0x20101)))
// Borland 5.5.1 with RW
library crashes
// empty string
std::string(""),
// no bitset
spaces,
#endif
// no bitset
std::string("x"),
std::string("\t xyz"),
// bitset of size 1
std::string("0"),
std::string("1"),
std::string(" 0 "),
std::string(" 1 "),
spaces + "1",
"1" + spaces,
spaces + "1" + spaces,
std::string(" x1x "),
std::string(" 1x "),
// long bitset
long_string,
" " + long_string + " xyz",
spaces + long_string,
spaces + long_string + spaces
};
in run_test_cases() appears to get destructed right after it is
constructed. I haven't figured out what the trigger is yet. I haven't
been able to reproduce the symptom in a smaller example, and it doesn't
appear to happen with the other strings[] local array:
std::string strings[] = {
std::string(""),
std::string("0"),
std::string("1"),
std::string("11100"),
get_long_string()
};
Destruction of "short" strings is harmless as we're using the short
string optimization. But once you hit strings[13] (corresponding to
the long_string entry) then the test starts working with a string with
entries other than '0' and '1', and things pretty much fall apart.
A workaround is to declare the strings[] array static.
I've sent a test case to the compiler team and if they turn up any
further information or workarounds I'll pass it on here.
-Howard