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, c++11, c++14, c++17, c++20 10 11 // constexpr unexpected& operator=(const unexpected&) = default; 12 13 #include <cassert> 14 #include <expected> 15 16 struct Error { 17 int i; 18 constexpr Error(int ii) : i(ii) {} 19 }; 20 21 constexpr bool test() { 22 std::unexpected<Error> unex1(4); 23 const std::unexpected<Error> unex2(5); 24 unex1 = unex2; 25 assert(unex1.error().i == 5); 26 return true; 27 } 28 29 int main(int, char**) { 30 test(); 31 static_assert(test()); 32 return 0; 33 } 34