obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
directory might differ from line-endings of the respective
files in the upstream repository.

1 files changed, 85 insertions, 0 deletions

diff --git a/libstdc++-v3/testsuite/20_util/tuple/creation_functions/48476.cc b/libstdc++-v3/testsuite/20_util/tuple/creation_functions/48476.cc
new file mode 100644
index 000000000..1607e4552
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/tuple/creation_functions/48476.cc
@@ -0,0 +1,85 @@
+// { dg-options "-std=gnu++0x" }
+
+// Copyright (C) 2011 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 <tuple>
+#include <type_traits>
+#include <testsuite_hooks.h>
+
+template<typename T>
+  typename std::decay<T>::type copy(T&& x)
+  { return std::forward<T>(x); }
+
+template<typename... Args1, typename... Args2>
+  void
+  check_tuple_cat(std::tuple<Args1...> t1, std::tuple<Args2...> t2)
+  {
+    bool test __attribute__((unused)) = true;
+
+    typedef std::tuple<Args1..., Args2...> concatenated;
+  
+    auto cat1 = std::tuple_cat(     t1,       t2 );
+    auto cat2 = std::tuple_cat(copy(t1),      t2 );
+    auto cat3 = std::tuple_cat(     t1,  copy(t2));
+    auto cat4 = std::tuple_cat(copy(t1), copy(t2));
+  
+    static_assert( std::is_same<decltype(cat1), concatenated>::value, "" );
+    static_assert( std::is_same<decltype(cat2), concatenated>::value, "" );
+    static_assert( std::is_same<decltype(cat3), concatenated>::value, "" );
+    static_assert( std::is_same<decltype(cat4), concatenated>::value, "" );
+  
+    VERIFY( cat1 == cat2 );
+    VERIFY( cat1 == cat3 );
+    VERIFY( cat1 == cat4 );
+  }
+
+// libstdc++/48476
+void test01()
+{
+  int i = 0;
+  std::tuple<> t0;
+  std::tuple<int&> t1(i);
+  std::tuple<int&, int> t2(i, 0);
+  std::tuple<int const&, int, double> t3(i, 0, 0);
+  
+  check_tuple_cat(t0, t0);
+  check_tuple_cat(t0, t1);
+  check_tuple_cat(t0, t2);
+  check_tuple_cat(t0, t3);
+  
+  check_tuple_cat(t1, t0);
+  check_tuple_cat(t1, t1);
+  check_tuple_cat(t1, t2);
+  check_tuple_cat(t1, t3);
+  
+  check_tuple_cat(t2, t0);
+  check_tuple_cat(t2, t1);
+  check_tuple_cat(t2, t2);
+  check_tuple_cat(t2, t3);
+  
+  check_tuple_cat(t3, t0);
+  check_tuple_cat(t3, t1);
+  check_tuple_cat(t3, t2);
+  check_tuple_cat(t3, t3);
+}
+
+int main()
+{
+  test01();
+  return 0;
+}