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      1 //===----------------------------------------------------------------------===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is dual licensed under the MIT and the University of Illinois Open
      6 // Source Licenses. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 
     10 // <tuple>
     11 
     12 // template <class... Types> class tuple;
     13 
     14 // template <class... UTypes>
     15 //   tuple& operator=(tuple<UTypes...>&& u);
     16 
     17 // UNSUPPORTED: c++98, c++03
     18 
     19 #include <tuple>
     20 #include <string>
     21 #include <memory>
     22 #include <utility>
     23 #include <cassert>
     24 
     25 struct B
     26 {
     27     int id_;
     28 
     29     explicit B(int i= 0) : id_(i) {}
     30 
     31     virtual ~B() {}
     32 };
     33 
     34 struct D
     35     : B
     36 {
     37     explicit D(int i) : B(i) {}
     38 };
     39 
     40 int main()
     41 {
     42     {
     43         typedef std::tuple<double> T0;
     44         typedef std::tuple<int> T1;
     45         T0 t0(2.5);
     46         T1 t1;
     47         t1 = std::move(t0);
     48         assert(std::get<0>(t1) == 2);
     49     }
     50     {
     51         typedef std::tuple<double, char> T0;
     52         typedef std::tuple<int, int> T1;
     53         T0 t0(2.5, 'a');
     54         T1 t1;
     55         t1 = std::move(t0);
     56         assert(std::get<0>(t1) == 2);
     57         assert(std::get<1>(t1) == int('a'));
     58     }
     59     {
     60         typedef std::tuple<double, char, D> T0;
     61         typedef std::tuple<int, int, B> T1;
     62         T0 t0(2.5, 'a', D(3));
     63         T1 t1;
     64         t1 = std::move(t0);
     65         assert(std::get<0>(t1) == 2);
     66         assert(std::get<1>(t1) == int('a'));
     67         assert(std::get<2>(t1).id_ == 3);
     68     }
     69     {
     70         D d(3);
     71         D d2(2);
     72         typedef std::tuple<double, char, D&> T0;
     73         typedef std::tuple<int, int, B&> T1;
     74         T0 t0(2.5, 'a', d2);
     75         T1 t1(1.5, 'b', d);
     76         t1 = std::move(t0);
     77         assert(std::get<0>(t1) == 2);
     78         assert(std::get<1>(t1) == int('a'));
     79         assert(std::get<2>(t1).id_ == 2);
     80     }
     81     {
     82         typedef std::tuple<double, char, std::unique_ptr<D>> T0;
     83         typedef std::tuple<int, int, std::unique_ptr<B>> T1;
     84         T0 t0(2.5, 'a', std::unique_ptr<D>(new D(3)));
     85         T1 t1;
     86         t1 = std::move(t0);
     87         assert(std::get<0>(t1) == 2);
     88         assert(std::get<1>(t1) == int('a'));
     89         assert(std::get<2>(t1)->id_ == 3);
     90     }
     91 }
     92