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
main(int,char **)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