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https://issues.apache.org/jira/browse/STDCXX-214?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martin Sebor updated STDCXX-214:
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Summary: [LWG #467] std::char_traits<char>::compare() broken for negative
characters (was: std::char_traits<char>::compare() broken for negative
characters)
This problem is the subject of Library Working Group issue 467:
http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#467
> [LWG #467] std::char_traits<char>::compare() broken for negative characters
> ---------------------------------------------------------------------------
>
> Key: STDCXX-214
> URL: https://issues.apache.org/jira/browse/STDCXX-214
> Project: C++ Standard Library
> Issue Type: Bug
> Components: 21. Strings
> Affects Versions: 4.1.3, 4.1.2
> Environment: all
> Reporter: Martin Sebor
> Assigned To: Martin Sebor
>
> Moved from the Rogue Wave bug tracking database:
> ****Created By: sebor @ May 03, 2004 03:04:54 PM****
> According to Table 37 in [lib.char.traits.require]:
> X::compare(p,q,n) yields: 0 if for each i in [0,n), X::eq(p[i],q[i]) is true;
> else, a negative value if, for some j in [0,n), X::lt(p[j],q[j]) is true and
> for each i in [0,j) X::eq(p[i],q[i]) is true; else a positive value.
> The following fails with gcc 3.4 on SunOS 5.7 because
> char_traits<char>::compare() uses memcmp() which, on this platform, compares
> characters as if they were unsigned.
> $ cat t.cpp && ./t
> /* 1 */ #include <cassert>
> /* 2 */ #include <string>
> /* 3 */
> /* 4 */ int main ()
> /* 5 */ {
> /* 6 */ typedef std::char_traits<char> Traits;
> /* 7 */
> /* 8 */ const char s[] = "\0\377";
> /* 9 */
> /* 10 */ if (Traits::lt (s [0], s [1]))
> /* 11 */ assert (Traits::compare (s + 0, s + 1, 1) < 0);
> /* 12 */ else
> /* 13 */ assert (Traits::compare (s + 0, s + 1, 1) > 0);
> /* 14 */ }
> /* 15 */
> Assertion failed: Traits::compare (s + 0, s + 1, 1) > 0, file t.cpp, line 13
> Abort (core dumped)
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