| //===----------------------------------------------------------------------===// |
| // |
| // 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. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // UNSUPPORTED: c++98, c++03, c++11, c++14 |
| // <optional> |
| |
| // optional<T>& operator=(nullopt_t) noexcept; |
| |
| #include <optional> |
| #include <type_traits> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| #include "archetypes.hpp" |
| |
| using std::optional; |
| using std::nullopt_t; |
| using std::nullopt; |
| |
| int main() |
| { |
| { |
| optional<int> opt; |
| static_assert(noexcept(opt = nullopt) == true, ""); |
| opt = nullopt; |
| assert(static_cast<bool>(opt) == false); |
| } |
| { |
| optional<int> opt(3); |
| opt = nullopt; |
| assert(static_cast<bool>(opt) == false); |
| } |
| using TT = TestTypes::TestType; |
| TT::reset(); |
| { |
| optional<TT> opt; |
| static_assert(noexcept(opt = nullopt) == true, ""); |
| assert(TT::destroyed == 0); |
| opt = nullopt; |
| assert(TT::constructed == 0); |
| assert(TT::alive == 0); |
| assert(TT::destroyed == 0); |
| assert(static_cast<bool>(opt) == false); |
| } |
| assert(TT::alive == 0); |
| assert(TT::destroyed == 0); |
| TT::reset(); |
| { |
| optional<TT> opt(42); |
| assert(TT::destroyed == 0); |
| TT::reset_constructors(); |
| opt = nullopt; |
| assert(TT::constructed == 0); |
| assert(TT::alive == 0); |
| assert(TT::destroyed == 1); |
| assert(static_cast<bool>(opt) == false); |
| } |
| assert(TT::alive == 0); |
| assert(TT::destroyed == 1); |
| TT::reset(); |
| } |