The program below is expected to run successfully to completion since there
is no MyCtype facet installed in the classic locale (and, in fact, no facet
of that type can exist since it doesn't have an accessible ctor).
$ cat u.cpp && g++ -dumpversion && g++ u.cpp -static && ./a.out
#include <cassert>
#include <locale>
struct MyCtype: std::ctype<char> { private: MyCtype (); };
int main ()
{
assert (std::has_facet<std::ctype<char> >(std::locale::classic ()));
assert (!std::has_facet<MyCtype>(std::locale::classic ()));
}
4.1.0
Assertion failed: !std::has_facet<MyCtype>(std::locale::classic ()), file
u.cpp, line 9
Abort (core dumped)
--
Summary: std::has_facet returns true for not installed derived
facets
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: sebor at roguewave dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30127
