| //===----------------------------------------------------------------------===// |
| // 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(const expected& rhs); |
| // |
| // Effects: If rhs.has_value() is false, direct-non-list-initializes unex with rhs.error(). |
| // |
| // Postconditions: rhs.has_value() == this->has_value(). |
| // |
| // Throws: Any exception thrown by the initialization of unex. |
| // |
| // Remarks: |
| // - This constructor is defined as deleted unless is_copy_constructible_v<E> is true. |
| // - This constructor is trivial if is_trivially_copy_constructible_v<E> is true. |
| |
| #include <cassert> |
| #include <expected> |
| #include <type_traits> |
| #include <utility> |
| |
| #include "test_macros.h" |
| |
| struct NonCopyable { |
| NonCopyable(const NonCopyable&) = delete; |
| }; |
| |
| struct CopyableNonTrivial { |
| int i; |
| constexpr CopyableNonTrivial(int ii) : i(ii) {} |
| constexpr CopyableNonTrivial(const CopyableNonTrivial& o) { i = o.i; } |
| friend constexpr bool operator==(const CopyableNonTrivial&, const CopyableNonTrivial&) = default; |
| }; |
| |
| // Test: This constructor is defined as deleted unless is_copy_constructible_v<E> is true. |
| static_assert(std::is_copy_constructible_v<std::expected<void, int>>); |
| static_assert(std::is_copy_constructible_v<std::expected<void, CopyableNonTrivial>>); |
| static_assert(!std::is_copy_constructible_v<std::expected<void, NonCopyable>>); |
| |
| // Test: This constructor is trivial if is_trivially_copy_constructible_v<E> is true. |
| static_assert(std::is_trivially_copy_constructible_v<std::expected<void, int>>); |
| static_assert(!std::is_trivially_copy_constructible_v<std::expected<void, CopyableNonTrivial>>); |
| |
| constexpr bool test() { |
| // copy the error non-trivial |
| { |
| const std::expected<void, CopyableNonTrivial> e1(std::unexpect, 5); |
| auto e2 = e1; |
| assert(!e2.has_value()); |
| assert(e2.error().i == 5); |
| } |
| |
| // copy the error trivial |
| { |
| const std::expected<void, int> e1(std::unexpect, 5); |
| auto e2 = e1; |
| assert(!e2.has_value()); |
| assert(e2.error() == 5); |
| } |
| return true; |
| } |
| |
| void testException() { |
| #ifndef TEST_HAS_NO_EXCEPTIONS |
| struct Except {}; |
| |
| struct Throwing { |
| Throwing() = default; |
| Throwing(const Throwing&) { throw Except{}; } |
| }; |
| |
| // throw on copying error |
| { |
| const std::expected<void, Throwing> e1(std::unexpect); |
| try { |
| [[maybe_unused]] auto e2 = e1; |
| assert(false); |
| } catch (Except) { |
| } |
| } |
| |
| #endif // TEST_HAS_NO_EXCEPTIONS |
| } |
| |
| int main(int, char**) { |
| test(); |
| static_assert(test()); |
| testException(); |
| return 0; |
| } |