+// 2003-07-06 Benjamin Kosnik <bkoz@redhat.com>
+
+// Copyright (C) 2003, 2009 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <locale>
+#include <sstream>
+#include <ostream>
+#include <testsuite_hooks.h>
+
+class numpunct_checked : public std::numpunct<char>
+{
+ typedef std::numpunct<char> base;
+
+public:
+ explicit
+ numpunct_checked(std::size_t refs = 0): base(refs) { }
+
+ string_type
+ base_truename() const
+ { return base::do_truename(); }
+
+protected:
+ virtual string_type
+ do_truename() const
+ { return base::do_truename() + "st"; }
+};
+
+// Thwart locale caching strategies that incorrectly overwrite base
+// class data.
+void test01()
+{
+ using namespace std;
+
+ bool test __attribute__((unused)) = true;
+ const string basestr("true");
+ const string derivedstr("truest");
+
+ const locale loc(locale::classic(), new numpunct_checked);
+ stringbuf sbuf;
+ ostream os(&sbuf);
+ os.setf(ios_base::boolalpha);
+
+ // Pre-cache sanity check.
+ const numpunct<char>& np = use_facet<numpunct<char> >(loc);
+ VERIFY( np.truename() == derivedstr );
+
+ // Cache.
+ os.imbue(loc);
+ os << true;
+ VERIFY( sbuf.str() == derivedstr );
+
+ // Post-cache sanity check, make sure that base class is still fine.
+ VERIFY( np.truename() == derivedstr );
+ const numpunct_checked& npd = static_cast<const numpunct_checked&>(np);
+ VERIFY( npd.base_truename() == basestr );
+}
+
+int main()
+{
+ test01();
+ return 0;
+}