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