1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 // <utility>
10 
11 // template <class T1, class T2> struct pair
12 
13 // explicit(see-below) constexpr pair();
14 
15 // NOTE: The SFINAE on the default constructor is tested in
16 //       default-sfinae.pass.cpp
17 
18 
19 #include <utility>
20 #include <type_traits>
21 #include <cassert>
22 
23 #include "test_macros.h"
24 #include "archetypes.h"
25 
26 int main(int, char**)
27 {
28     {
29         typedef std::pair<float, short*> P;
30         P p;
31         assert(p.first == 0.0f);
32         assert(p.second == nullptr);
33     }
34 #if TEST_STD_VER >= 11
35     {
36         typedef std::pair<float, short*> P;
37         constexpr P p;
38         static_assert(p.first == 0.0f, "");
39         static_assert(p.second == nullptr, "");
40     }
41     {
42         using NoDefault = ImplicitTypes::NoDefault;
43         using P = std::pair<int, NoDefault>;
44         static_assert(!std::is_default_constructible<P>::value, "");
45         using P2 = std::pair<NoDefault, int>;
46         static_assert(!std::is_default_constructible<P2>::value, "");
47     }
48     {
49         struct Base { };
50         struct Derived : Base { protected: Derived() = default; };
51         static_assert(!std::is_default_constructible<std::pair<Derived, int> >::value, "");
52     }
53 #endif
54 
55   return 0;
56 }
57