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 // UNSUPPORTED: c++03
10 
11 // <utility>
12 
13 // template <class T1, class T2> struct pair
14 
15 // explicit(see-below) constexpr pair();
16 
17 // This test checks the conditional explicitness of std::pair's default
18 // constructor as introduced by the resolution of https://wg21.link/LWG2510.
19 
20 #include <utility>
21 
22 
23 struct ImplicitlyDefaultConstructible {
24     ImplicitlyDefaultConstructible() = default;
25 };
26 
27 struct ExplicitlyDefaultConstructible {
28     explicit ExplicitlyDefaultConstructible() = default;
29 };
30 
test1()31 std::pair<ImplicitlyDefaultConstructible, ExplicitlyDefaultConstructible> test1() { return {}; } // expected-error 1 {{chosen constructor is explicit in copy-initialization}}
test2()32 std::pair<ExplicitlyDefaultConstructible, ImplicitlyDefaultConstructible> test2() { return {}; } // expected-error 1 {{chosen constructor is explicit in copy-initialization}}
test3()33 std::pair<ExplicitlyDefaultConstructible, ExplicitlyDefaultConstructible> test3() { return {}; } // expected-error 1 {{chosen constructor is explicit in copy-initialization}}
test4()34 std::pair<ImplicitlyDefaultConstructible, ImplicitlyDefaultConstructible> test4() { return {}; }
35