--- /dev/null
+// Copyright (C) 2006, 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/>.
+
+// 27.8.1.4 Overridden virtual functions
+
+#include <sstream>
+#include <testsuite_hooks.h>
+
+struct pubbuf
+: std::wstringbuf
+{
+ using std::wstringbuf::eback;
+ using std::wstringbuf::egptr;
+ using std::wstringbuf::pbase;
+ using std::wstringbuf::pptr;
+ using std::wstringbuf::epptr;
+ using std::wstringbuf::overflow;
+};
+
+// libstdc++/26250
+void test01()
+{
+ bool test __attribute__((unused)) = true;
+
+ pubbuf buf;
+
+ VERIFY( buf.overflow(L'x') == L'x' );
+ VERIFY( buf.pptr() - buf.pbase() == 1 );
+
+ // not required but good for efficiency
+ // NB: we are implementing DR 169 and DR 432
+ const int write_positions = buf.epptr() - buf.pbase();
+ VERIFY( write_positions > 1 );
+
+ // 27.7.1.3, p8:
+ VERIFY( buf.egptr() - buf.eback() == 1 );
+}
+
+int main()
+{
+ test01();
+ return 0;
+}