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=(unexpected&&) = default; 12 13 #include <cassert> 14 #include <expected> 15 #include <utility> 16 17 struct Error { 18 int i; 19 constexpr Error(int ii) : i(ii) {} 20 constexpr Error& operator=(Error&& other) { 21 i = other.i; 22 other.i = 0; 23 return *this; 24 } 25 }; 26 27 constexpr bool test() { 28 std::unexpected<Error> unex1(4); 29 std::unexpected<Error> unex2(5); 30 unex1 = std::move(unex2); 31 assert(unex1.error().i == 5); 32 assert(unex2.error().i == 0); 33 return true; 34 } 35 36 int main(int, char**) { 37 test(); 38 static_assert(test()); 39 return 0; 40 } 41