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 // UNSUPPORTED: c++98, c++03, c++11
11
12 #include <utility>
13 #include <string>
14 #include <type_traits>
15 #include <complex>
16 #include <memory>
17
18 #include <cassert>
19
main()20 int main()
21 {
22 typedef std::complex<float> cf;
23 {
24 auto t1 = std::make_pair<int, cf> ( 42, { 1,2 } );
25 assert ( std::get<int>(t1) == 42 );
26 assert ( std::get<cf>(t1).real() == 1 );
27 assert ( std::get<cf>(t1).imag() == 2 );
28 }
29
30 {
31 const std::pair<int, const int> p1 { 1, 2 };
32 const int &i1 = std::get<int>(p1);
33 const int &i2 = std::get<const int>(p1);
34 assert ( i1 == 1 );
35 assert ( i2 == 2 );
36 }
37
38 {
39 typedef std::unique_ptr<int> upint;
40 std::pair<upint, int> t(upint(new int(4)), 42);
41 upint p = std::get<upint>(std::move(t)); // get rvalue
42 assert(*p == 4);
43 assert(std::get<upint>(t) == nullptr); // has been moved from
44 }
45
46 {
47 typedef std::unique_ptr<int> upint;
48 const std::pair<upint, int> t(upint(new int(4)), 42);
49 static_assert(std::is_same<const upint&&, decltype(std::get<upint>(std::move(t)))>::value, "");
50 static_assert(noexcept(std::get<upint>(std::move(t))), "");
51 static_assert(std::is_same<const int&&, decltype(std::get<int>(std::move(t)))>::value, "");
52 static_assert(noexcept(std::get<int>(std::move(t))), "");
53 auto&& p = std::get<upint>(std::move(t)); // get const rvalue
54 auto&& i = std::get<int>(std::move(t)); // get const rvalue
55 assert(*p == 4);
56 assert(i == 42);
57 assert(std::get<upint>(t) != nullptr);
58 }
59
60 {
61 int x = 42;
62 int const y = 43;
63 std::pair<int&, int const&> const p(x, y);
64 static_assert(std::is_same<int&, decltype(std::get<int&>(std::move(p)))>::value, "");
65 static_assert(noexcept(std::get<int&>(std::move(p))), "");
66 static_assert(std::is_same<int const&, decltype(std::get<int const&>(std::move(p)))>::value, "");
67 static_assert(noexcept(std::get<int const&>(std::move(p))), "");
68 }
69
70 {
71 int x = 42;
72 int const y = 43;
73 std::pair<int&&, int const&&> const p(std::move(x), std::move(y));
74 static_assert(std::is_same<int&&, decltype(std::get<int&&>(std::move(p)))>::value, "");
75 static_assert(noexcept(std::get<int&&>(std::move(p))), "");
76 static_assert(std::is_same<int const&&, decltype(std::get<int const&&>(std::move(p)))>::value, "");
77 static_assert(noexcept(std::get<int const&&>(std::move(p))), "");
78 }
79
80 {
81 constexpr const std::pair<int, const int> p { 1, 2 };
82 static_assert(std::get<int>(std::move(p)) == 1, "");
83 static_assert(std::get<const int>(std::move(p)) == 2, "");
84 }
85 }
86