| //===----------------------------------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is dual licensed under the MIT and the University of Illinois Open |
| // Source Licenses. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <optional> |
| |
| // optional<T>& operator=(optional<T>&& rhs) |
| // noexcept(is_nothrow_move_assignable<T>::value && |
| // is_nothrow_move_constructible<T>::value); |
| |
| #include <experimental/optional> |
| #include <type_traits> |
| #include <cassert> |
| |
| #if _LIBCPP_STD_VER > 11 |
| |
| using std::experimental::optional; |
| |
| struct X |
| { |
| static bool throw_now; |
| |
| X() = default; |
| X(X&&) |
| { |
| if (throw_now) |
| throw 6; |
| } |
| X& operator=(X&&) noexcept |
| { |
| return *this; |
| } |
| }; |
| |
| struct Y {}; |
| |
| bool X::throw_now = false; |
| |
| #endif // _LIBCPP_STD_VER > 11 |
| |
| int main() |
| { |
| #if _LIBCPP_STD_VER > 11 |
| { |
| static_assert(std::is_nothrow_move_assignable<optional<int>>::value, ""); |
| optional<int> opt; |
| constexpr optional<int> opt2; |
| opt = std::move(opt2); |
| static_assert(static_cast<bool>(opt2) == false, ""); |
| assert(static_cast<bool>(opt) == static_cast<bool>(opt2)); |
| } |
| { |
| optional<int> opt; |
| constexpr optional<int> opt2(2); |
| opt = std::move(opt2); |
| static_assert(static_cast<bool>(opt2) == true, ""); |
| static_assert(*opt2 == 2, ""); |
| assert(static_cast<bool>(opt) == static_cast<bool>(opt2)); |
| assert(*opt == *opt2); |
| } |
| { |
| optional<int> opt(3); |
| constexpr optional<int> opt2; |
| opt = std::move(opt2); |
| static_assert(static_cast<bool>(opt2) == false, ""); |
| assert(static_cast<bool>(opt) == static_cast<bool>(opt2)); |
| } |
| { |
| optional<int> opt(3); |
| constexpr optional<int> opt2(2); |
| opt = std::move(opt2); |
| static_assert(static_cast<bool>(opt2) == true, ""); |
| static_assert(*opt2 == 2, ""); |
| assert(static_cast<bool>(opt) == static_cast<bool>(opt2)); |
| assert(*opt == *opt2); |
| } |
| { |
| static_assert(!std::is_nothrow_move_assignable<optional<X>>::value, ""); |
| optional<X> opt; |
| optional<X> opt2(X{}); |
| assert(static_cast<bool>(opt2) == true); |
| try |
| { |
| X::throw_now = true; |
| opt = std::move(opt2); |
| assert(false); |
| } |
| catch (int i) |
| { |
| assert(i == 6); |
| assert(static_cast<bool>(opt) == false); |
| } |
| } |
| { |
| static_assert(std::is_nothrow_move_assignable<optional<Y>>::value, ""); |
| } |
| #endif // _LIBCPP_STD_VER > 11 |
| } |