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Posted to dev@stdcxx.apache.org by "Farid Zaripov (JIRA)" <ji...@apache.org> on 2007/08/27 21:01:38 UTC
[jira] Resolved: (STDCXX-462) std::time_get example exposes
undefined behavior
[ https://issues.apache.org/jira/browse/STDCXX-462?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Farid Zaripov resolved STDCXX-462.
----------------------------------
Resolution: Fixed
Documentation updated thus: http://svn.apache.org/viewvc?rev=570219&view=rev
> std::time_get example exposes undefined behavior
> ------------------------------------------------
>
> Key: STDCXX-462
> URL: https://issues.apache.org/jira/browse/STDCXX-462
> Project: C++ Standard Library
> Issue Type: Bug
> Components: Documentation
> Affects Versions: 4.1.2, 4.1.3
> Reporter: Martin Sebor
> Assignee: Farid Zaripov
> Priority: Critical
> Fix For: 4.2
>
>
> The example program demonstrating the use of the std::time_get facet (http://incubator.apache.org/stdcxx/doc/stdlibref/time-get.html) exposes undefined behavior. Quoting from the following post http://www.mail-archive.com/stdcxx-dev@incubator.apache.org/msg03760.html:
> Martin Sebor wrote:
> > Farid Zaripov wrote:
> [...]
> >> Btw below is a part of the conforming program (taken from
> >> time_get.cpp)?
> >
> > It's not a conforming program. The locale must stay around as
> > long as the last reference to the facet obtained from it. The
> > tests that fail to follow this rule should be changed.
> >
> >>
> >> -------------------
> >> const std::time_get<char, Iter> &tg =
> >> std::use_facet<std::time_get<char, Iter> >(std::locale ("C"));
> >>
> >> // Display time_base::dateorder value.
> >> std::cout << "time_base::dateorder == " << tg.date_order () <<
> >> ".\n";
> >> -------------------
> >>
> >> This fragment fails on Dinkumware STL because of tg.date_order() uses
> >> (internal)
> >> pointer to the destroyed locale object.
> >
> > Right, and that's allowed.
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