text: //===----------------------------------------------------------------------===//
  //
  //                     The LLVM Compiler Infrastructure
  //
  // This file is dual licensed under the MIT and the University of Illinois Open
  // Source Licenses. See LICENSE.TXT for details.
  //
  //===----------------------------------------------------------------------===//
  
  // <tuple>
  
  // template <class... Types> class tuple;
  
  // template <class U1, class U2> tuple(pair<U1, U2>&& u);
  
  // UNSUPPORTED: c++98, c++03
  
  #include <tuple>
  #include <utility>
  #include <memory>
  #include <cassert>
  
  struct B
  {
      int id_;
  
      explicit B(int i) : id_(i) {}
  
      virtual ~B() {}
  };
  
  struct D
      : B
  {
      explicit D(int i) : B(i) {}
  };
  
  int main()
  {
      {
          typedef std::pair<double, std::unique_ptr<D>> T0;
          typedef std::tuple<int, std::unique_ptr<B>> T1;
          T0 t0(2.5, std::unique_ptr<D>(new D(3)));
          T1 t1 = std::move(t0);
          assert(std::get<0>(t1) == 2);
          assert(std::get<1>(t1)->id_ == 3);
      }
  }
  