| //===----------------------------------------------------------------------===// |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20 |
| |
| // constexpr expected(expected&& rhs) noexcept(is_nothrow_move_constructible_v<E>); |
| // |
| // Constraints: is_move_constructible_v<E> is true. |
| // |
| // Effects: If rhs.has_value() is false, direct-non-list-initializes unex with std::move(rhs.error()). |
| // |
| // Postconditions: rhs.has_value() is unchanged; rhs.has_value() == this->has_value() is true. |
| // |
| // Throws: Any exception thrown by the initialization of unex. |
| // |
| // Remarks: This constructor is trivial if is_trivially_move_constructible_v<E> is true. |
| |
| #include <cassert> |
| #include <expected> |
| #include <type_traits> |
| #include <utility> |
| |
| #include "test_macros.h" |
| |
| struct NonMovable { |
| NonMovable(NonMovable&&) = delete; |
| }; |
| |
| struct MovableNonTrivial { |
| int i; |
| constexpr MovableNonTrivial(int ii) : i(ii) {} |
| constexpr MovableNonTrivial(MovableNonTrivial&& o) : i(o.i) { o.i = 0; } |
| friend constexpr bool operator==(const MovableNonTrivial&, const MovableNonTrivial&) = default; |
| }; |
| |
| struct MoveMayThrow { |
| MoveMayThrow(MoveMayThrow&&) {} |
| }; |
| |
| // Test Constraints: |
| // - is_move_constructible_v<E> is true. |
| static_assert(std::is_move_constructible_v<std::expected<void, int>>); |
| static_assert(std::is_move_constructible_v<std::expected<void, MovableNonTrivial>>); |
| static_assert(!std::is_move_constructible_v<std::expected<void, NonMovable>>); |
| |
| // Test: This constructor is trivial if is_trivially_move_constructible_v<E> is true. |
| static_assert(std::is_trivially_move_constructible_v<std::expected<void, int>>); |
| static_assert(!std::is_trivially_move_constructible_v<std::expected<void, MovableNonTrivial>>); |
| |
| // Test: noexcept(is_nothrow_move_constructible_v<E>) |
| static_assert(std::is_nothrow_move_constructible_v<std::expected<int, int>>); |
| static_assert(!std::is_nothrow_move_constructible_v<std::expected<MoveMayThrow, int>>); |
| static_assert(!std::is_nothrow_move_constructible_v<std::expected<int, MoveMayThrow>>); |
| static_assert(!std::is_nothrow_move_constructible_v<std::expected<MoveMayThrow, MoveMayThrow>>); |
| |
| constexpr bool test() { |
| // move the error non-trivial |
| { |
| std::expected<void, MovableNonTrivial> e1(std::unexpect, 5); |
| auto e2 = std::move(e1); |
| assert(!e2.has_value()); |
| assert(e2.error().i == 5); |
| assert(!e1.has_value()); |
| assert(e1.error().i == 0); |
| } |
| |
| // move the error trivial |
| { |
| std::expected<void, int> e1(std::unexpect, 5); |
| auto e2 = std::move(e1); |
| assert(!e2.has_value()); |
| assert(e2.error() == 5); |
| assert(!e1.has_value()); |
| } |
| return true; |
| } |
| |
| void testException() { |
| #ifndef TEST_HAS_NO_EXCEPTIONS |
| struct Except {}; |
| |
| struct Throwing { |
| Throwing() = default; |
| Throwing(Throwing&&) { throw Except{}; } |
| }; |
| |
| // throw on moving error |
| { |
| std::expected<void, Throwing> e1(std::unexpect); |
| try { |
| [[maybe_unused]] auto e2 = std::move(e1); |
| assert(false); |
| } catch (Except) { |
| } |
| } |
| |
| #endif // TEST_HAS_NO_EXCEPTIONS |
| } |
| |
| int main(int, char**) { |
| test(); |
| static_assert(test()); |
| testException(); |
| return 0; |
| } |