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 U1, class U2> tuple(const pair<U1, U2>& u);
15
16 // UNSUPPORTED: c++98, c++03
17
18 #include <tuple>
19 #include <utility>
20 #include <cassert>
21
main()22 int main()
23 {
24 {
25 typedef std::pair<double, char> T0;
26 typedef std::tuple<int, short> T1;
27 T0 t0(2.5, 'a');
28 T1 t1 = t0;
29 assert(std::get<0>(t1) == 2);
30 assert(std::get<1>(t1) == short('a'));
31 }
32 #if _LIBCPP_STD_VER > 11
33 {
34 typedef std::pair<double, char> P0;
35 typedef std::tuple<int, short> T1;
36 constexpr P0 p0(2.5, 'a');
37 constexpr T1 t1 = p0;
38 static_assert(std::get<0>(t1) != std::get<0>(p0), "");
39 static_assert(std::get<1>(t1) == std::get<1>(p0), "");
40 static_assert(std::get<0>(t1) == 2, "");
41 static_assert(std::get<1>(t1) == short('a'), "");
42 }
43 #endif
44 }
45