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// { 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;

}