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 ~expected(); 12 // 13 // Effects: If has_value() is false, destroys unex. 14 // 15 // Remarks: If is_trivially_destructible_v<E> is true, then this destructor is a trivial destructor. 16 17 #include <cassert> 18 #include <expected> 19 #include <type_traits> 20 #include <utility> 21 22 #include "test_macros.h" 23 24 // Test Remarks: If is_trivially_destructible_v<E> is true, then this destructor is a trivial destructor. 25 struct NonTrivial { 26 ~NonTrivial() {} 27 }; 28 29 static_assert(std::is_trivially_destructible_v<std::expected<void, int>>); 30 static_assert(!std::is_trivially_destructible_v<std::expected<void, NonTrivial>>); 31 32 struct TrackedDestroy { 33 bool& destroyed; 34 constexpr TrackedDestroy(bool& b) : destroyed(b) {} 35 constexpr ~TrackedDestroy() { destroyed = true; } 36 }; 37 38 constexpr bool test() { 39 // has value 40 { [[maybe_unused]] std::expected<void, TrackedDestroy> e(std::in_place); } 41 42 // has error 43 { 44 bool errorDestroyed = false; 45 { [[maybe_unused]] std::expected<void, TrackedDestroy> e(std::unexpect, errorDestroyed); } 46 assert(errorDestroyed); 47 } 48 49 return true; 50 } 51 52 int main(int, char**) { 53 test(); 54 static_assert(test()); 55 return 0; 56 } 57