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https://issues.apache.org/jira/browse/STDCXX-680?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12586200#action_12586200
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Martin Sebor commented on STDCXX-680:
-------------------------------------
Test case:
{noformat}
$ cat t.cpp && gmake t && LC_ALL=en_US ./t
#include <cassert>
#include <locale>
struct MyNumpunct: std::numpunct<char> { };
struct MyNumpunctByname: std::numpunct<char> { };
int main ()
{
const std::locale classic (std::locale::classic ());
const std::locale named ("");
assert (std::has_facet<std::numpunct<char> >(classic));
assert (!std::has_facet<MyNumpunct>(classic));
assert (!std::has_facet<std::numpunct_byname<char> >(classic));
assert (!std::has_facet<MyNumpunctByname>(classic));
if (named != classic) {
assert (std::has_facet<std::numpunct<char> >(named));
assert (!std::has_facet<MyNumpunct>(named));
assert (std::has_facet<std::numpunct_byname<char> >(named));
assert (!std::has_facet<MyNumpunctByname>(named));
}
}
xlCcore -c -I/amd/devco/sebor/stdcxx/include/ansi
-I/amd/devco/sebor/stdcxx/include -I/build/sebor/stdcxx-xlC-9.0-8d/include
-I/amd/devco/sebor/stdcxx/examples/include -O -qtemplateregistry=t.ti t.cpp
xlCcore t.o -o t -I/amd/devco/sebor/stdcxx/include/ansi -liconv -brtl
-L/build/sebor/stdcxx-xlC-9.0-8d/lib
-Wl,-bsvr4,-R/build/sebor/stdcxx-xlC-9.0-8d/lib -lstd8d -lm
-qtemplateregistry=t.ti
Assertion failed: !std::has_facet<MyNumpunct>(classic), file t.cpp, line 13
IOT/Abort trap (core dumped)
{noformat}
> use_facet and has_facet are unreliable unless dynamic_cast is available
> -----------------------------------------------------------------------
>
> Key: STDCXX-680
> URL: https://issues.apache.org/jira/browse/STDCXX-680
> Project: C++ Standard Library
> Issue Type: Bug
> Components: 22. Localization
> Affects Versions: 4.2.0
> Reporter: Travis Vitek
>
> The function that is called by has_facet<>() and use_facet<>() uses
> _RWSTD_DYNAMIC_CAST in an attempt to check that the returned locale facet is
> of the requested type. Unfortunately, if RTTI is not supported or enabled,
> that cast becomes unreliable.
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