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++98, c++03 10 11 // Before GCC 6, aggregate initialization kicks in. 12 // See https://stackoverflow.com/q/41799015/627587. 13 // UNSUPPORTED: gcc-5 14 15 // <utility> 16 17 // template <class T1, class T2> struct pair 18 19 // explicit(see-below) constexpr pair(); 20 21 // This test checks the conditional explicitness of std::pair's default 22 // constructor as introduced by the resolution of LWG 2510. 23 24 #include <utility> 25 26 27 struct ImplicitlyDefaultConstructible { 28 ImplicitlyDefaultConstructible() = default; 29 }; 30 31 struct ExplicitlyDefaultConstructible { 32 explicit ExplicitlyDefaultConstructible() = default; 33 }; 34 35 std::pair<ImplicitlyDefaultConstructible, ExplicitlyDefaultConstructible> test1() { return {}; } // expected-error 1 {{chosen constructor is explicit in copy-initialization}} 36 std::pair<ExplicitlyDefaultConstructible, ImplicitlyDefaultConstructible> test2() { return {}; } // expected-error 1 {{chosen constructor is explicit in copy-initialization}} 37 std::pair<ExplicitlyDefaultConstructible, ExplicitlyDefaultConstructible> test3() { return {}; } // expected-error 1 {{chosen constructor is explicit in copy-initialization}} 38 std::pair<ImplicitlyDefaultConstructible, ImplicitlyDefaultConstructible> test4() { return {}; } 39 40 int main(int, char**) { 41 return 0; 42 } 43