--- /dev/null
+// { dg-require-namedlocale "" }
+
+// 2005-04-08 Paolo Carlini <pcarlini@suse.de>
+
+// Copyright (C) 2005, 2009 Free Software Foundation
+//
+// 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/>.
+
+// 22.2.2.2.1 num_put members
+
+#include <locale>
+#include <sstream>
+#include <testsuite_hooks.h>
+
+// libstdc++/20909
+void test01()
+{
+ using namespace std;
+ bool test __attribute__((unused)) = true;
+
+ // A locale that expects grouping.
+ locale loc_de = locale("de_DE");
+
+ const string empty;
+ string result;
+
+ ostringstream oss;
+ oss.imbue(loc_de);
+ const num_put<char>& np = use_facet<num_put<char> >(oss.getloc());
+
+ double d0 = 2e20;
+ double d1 = -2e20;
+
+ oss.str(empty);
+ oss.clear();
+ np.put(oss.rdbuf(), oss, '*', d0);
+ result = oss.str();
+ VERIFY( result == "2e+20" );
+
+ oss.str(empty);
+ oss.clear();
+ np.put(oss.rdbuf(), oss, '*', d1);
+ result = oss.str();
+ VERIFY( result == "-2e+20" );
+
+ oss.str(empty);
+ oss.clear();
+ oss.setf(ios::uppercase);
+ np.put(oss.rdbuf(), oss, '*', d0);
+ result = oss.str();
+ VERIFY( result == "2E+20" );
+
+ oss.str(empty);
+ oss.clear();
+ oss.setf(ios::showpos);
+ np.put(oss.rdbuf(), oss, '*', d0);
+ result = oss.str();
+ VERIFY( result == "+2E+20" );
+}
+
+int main()
+{
+ test01();
+ return 0;
+}
+
+