libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.default.explicit_LWG2510.verify.cpp

   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
  31 std::pair<ImplicitlyDefaultConstructible, ExplicitlyDefaultConstructible> test1() { return {}; } // expected-error 1 {{chosen constructor is explicit in copy-initialization}}
  32 std::pair<ExplicitlyDefaultConstructible, ImplicitlyDefaultConstructible> test2() { return {}; } // expected-error 1 {{chosen constructor is explicit in copy-initialization}}
  33 std::pair<ExplicitlyDefaultConstructible, ExplicitlyDefaultConstructible> test3() { return {}; } // expected-error 1 {{chosen constructor is explicit in copy-initialization}}
  34 std::pair<ImplicitlyDefaultConstructible, ImplicitlyDefaultConstructible> test4() { return {}; }