diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 3ef5e292715..8b9518154e0 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,15 @@
+2005-01-24  Paolo Carlini  <pcarlini@suse.de>
+
+	* include/tr1/type_traits: Implement is_signed and is_unsigned.
+	* testsuite/tr1/4_metaprogramming/type_properties/
+	is_signed/is_signed.cc: New.
+	* testsuite/tr1/4_metaprogramming/type_properties/
+	is_signed/typedefs.cc: Likewise.
+	* testsuite/tr1/4_metaprogramming/type_properties/
+	is_unsigned/is_unsigned.cc: Likewise.
+	* testsuite/tr1/4_metaprogramming/type_properties/
+	is_unsigned/typedefs.cc: Likewise.
+
 2005-01-23  Paolo Carlini  <pcarlini@suse.de>
 
 	* docs/html/ext/lwg-active.html, lwg-defects.html: Import Revision 34.
diff --git a/libstdc++-v3/include/tr1/type_traits b/libstdc++-v3/include/tr1/type_traits
index 7fca1b87f7b..34c1c9fd076 100644
--- a/libstdc++-v3/include/tr1/type_traits
+++ b/libstdc++-v3/include/tr1/type_traits
@@ -517,6 +517,24 @@ namespace tr1
     struct has_virtual_destructor
     : public false_type { };
 
+  template<typename>
+    struct is_signed
+    : public false_type { };
+  _DEFINE_SPEC(0, is_signed, signed char, true)
+  _DEFINE_SPEC(0, is_signed, short, true)
+  _DEFINE_SPEC(0, is_signed, int, true)
+  _DEFINE_SPEC(0, is_signed, long, true)
+  _DEFINE_SPEC(0, is_signed, long long, true)
+
+  template<typename>
+    struct is_unsigned
+    : public false_type { };
+  _DEFINE_SPEC(0, is_unsigned, unsigned char, true)
+  _DEFINE_SPEC(0, is_unsigned, unsigned short, true)
+  _DEFINE_SPEC(0, is_unsigned, unsigned int, true)
+  _DEFINE_SPEC(0, is_unsigned, unsigned long, true)
+  _DEFINE_SPEC(0, is_unsigned, unsigned long long, true)
+
   template<typename _Tp>
     struct alignment_of
     : public integral_constant<std::size_t, __alignof__(_Tp)> { };
diff --git a/libstdc++-v3/testsuite/tr1/4_metaprogramming/type_properties/is_signed/is_signed.cc b/libstdc++-v3/testsuite/tr1/4_metaprogramming/type_properties/is_signed/is_signed.cc
new file mode 100644
index 00000000000..a987df279a1
--- /dev/null
+++ b/libstdc++-v3/testsuite/tr1/4_metaprogramming/type_properties/is_signed/is_signed.cc
@@ -0,0 +1,62 @@
+// 2005-01-24  Paolo Carlini  <pcarlini@suse.de>
+//
+// Copyright (C) 2005 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 4.5.3 Type properties
+
+#include <tr1/type_traits>
+#include <testsuite_hooks.h>
+#include <testsuite_tr1.h>
+
+void test01()
+{
+  bool test __attribute__((unused)) = true;
+  using std::tr1::is_signed;
+  using namespace __gnu_test;
+  
+  VERIFY( (test_category<is_signed, void>(false)) );
+  
+  VERIFY( (test_category<is_signed, char>(false)) );
+  VERIFY( (test_category<is_signed, signed char>(true)) );
+  VERIFY( (test_category<is_signed, unsigned char>(false)) );
+#ifdef _GLIBCXX_USE_WCHAR_T
+  VERIFY( (test_category<is_signed, wchar_t>(false)) );
+#endif
+  VERIFY( (test_category<is_signed, short>(true)) );
+  VERIFY( (test_category<is_signed, unsigned short>(false)) );
+  VERIFY( (test_category<is_signed, int>(true)) );
+  VERIFY( (test_category<is_signed, unsigned int>(false)) );
+  VERIFY( (test_category<is_signed, long>(true)) );
+  VERIFY( (test_category<is_signed, unsigned long>(false)) );
+  VERIFY( (test_category<is_signed, long long>(true)) );
+  VERIFY( (test_category<is_signed, unsigned long long>(false)) );
+
+  VERIFY( (test_category<is_signed, float>(false)) );
+  VERIFY( (test_category<is_signed, double>(false)) );
+  VERIFY( (test_category<is_signed, long double>(false)) );
+
+  // Sanity check.
+  VERIFY( (test_category<is_signed, ClassType>(false)) );
+}
+
+int main()
+{
+  test01();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/tr1/4_metaprogramming/type_properties/is_signed/typedefs.cc b/libstdc++-v3/testsuite/tr1/4_metaprogramming/type_properties/is_signed/typedefs.cc
new file mode 100644
index 00000000000..52a528a5fb3
--- /dev/null
+++ b/libstdc++-v3/testsuite/tr1/4_metaprogramming/type_properties/is_signed/typedefs.cc
@@ -0,0 +1,36 @@
+// 2005-01-24  Paolo Carlini  <pcarlini@suse.de>
+//
+// Copyright (C) 2005 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 
+// NB: This file is for testing tr1/type_traits with NO OTHER INCLUDES.
+
+#include <tr1/type_traits>
+
+// { dg-do compile }
+
+void test01()
+{
+  // Check for required typedefs
+  typedef std::tr1::is_signed<int>            test_type;
+  typedef test_type::value_type               value_type;
+  typedef test_type::type                     type;
+  typedef test_type::type::value_type         type_value_type;
+  typedef test_type::type::type               type_type;
+}
diff --git a/libstdc++-v3/testsuite/tr1/4_metaprogramming/type_properties/is_unsigned/is_unsigned.cc b/libstdc++-v3/testsuite/tr1/4_metaprogramming/type_properties/is_unsigned/is_unsigned.cc
new file mode 100644
index 00000000000..fc444b50326
--- /dev/null
+++ b/libstdc++-v3/testsuite/tr1/4_metaprogramming/type_properties/is_unsigned/is_unsigned.cc
@@ -0,0 +1,62 @@
+// 2005-01-24  Paolo Carlini  <pcarlini@suse.de>
+//
+// Copyright (C) 2005 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 4.5.3 Type properties
+
+#include <tr1/type_traits>
+#include <testsuite_hooks.h>
+#include <testsuite_tr1.h>
+
+void test01()
+{
+  bool test __attribute__((unused)) = true;
+  using std::tr1::is_unsigned;
+  using namespace __gnu_test;
+  
+  VERIFY( (test_category<is_unsigned, void>(false)) );
+  
+  VERIFY( (test_category<is_unsigned, char>(false)) );
+  VERIFY( (test_category<is_unsigned, signed char>(false)) );
+  VERIFY( (test_category<is_unsigned, unsigned char>(true)) );
+#ifdef _GLIBCXX_USE_WCHAR_T
+  VERIFY( (test_category<is_unsigned, wchar_t>(false)) );
+#endif
+  VERIFY( (test_category<is_unsigned, short>(false)) );
+  VERIFY( (test_category<is_unsigned, unsigned short>(true)) );
+  VERIFY( (test_category<is_unsigned, int>(false)) );
+  VERIFY( (test_category<is_unsigned, unsigned int>(true)) );
+  VERIFY( (test_category<is_unsigned, long>(false)) );
+  VERIFY( (test_category<is_unsigned, unsigned long>(true)) );
+  VERIFY( (test_category<is_unsigned, long long>(false)) );
+  VERIFY( (test_category<is_unsigned, unsigned long long>(true)) );
+
+  VERIFY( (test_category<is_unsigned, float>(false)) );
+  VERIFY( (test_category<is_unsigned, double>(false)) );
+  VERIFY( (test_category<is_unsigned, long double>(false)) );
+
+  // Sanity check.
+  VERIFY( (test_category<is_unsigned, ClassType>(false)) );
+}
+
+int main()
+{
+  test01();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/tr1/4_metaprogramming/type_properties/is_unsigned/typedefs.cc b/libstdc++-v3/testsuite/tr1/4_metaprogramming/type_properties/is_unsigned/typedefs.cc
new file mode 100644
index 00000000000..195a80c2738
--- /dev/null
+++ b/libstdc++-v3/testsuite/tr1/4_metaprogramming/type_properties/is_unsigned/typedefs.cc
@@ -0,0 +1,36 @@
+// 2005-01-24  Paolo Carlini  <pcarlini@suse.de>
+//
+// Copyright (C) 2005 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 
+// NB: This file is for testing tr1/type_traits with NO OTHER INCLUDES.
+
+#include <tr1/type_traits>
+
+// { dg-do compile }
+
+void test01()
+{
+  // Check for required typedefs
+  typedef std::tr1::is_unsigned<int>          test_type;
+  typedef test_type::value_type               value_type;
+  typedef test_type::type                     type;
+  typedef test_type::type::value_type         type_value_type;
+  typedef test_type::type::type               type_type;
+}