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
26int 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

source code of libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.default.pass.cpp