| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| |
| // Test the [[nodiscard]] extension in libc++. |
| |
| // template<class I> |
| // unspecified iter_move; |
| |
| #include <iterator> |
| |
| struct WithADL { |
| WithADL() = default; |
| constexpr decltype(auto) operator*() const noexcept; |
| constexpr WithADL& operator++() noexcept; |
| constexpr void operator++(int) noexcept; |
| constexpr bool operator==(WithADL const&) const noexcept; |
| friend constexpr auto iter_move(WithADL&) { return 0; } |
| }; |
| |
| void f() { |
| int* noADL = nullptr; |
| std::ranges::iter_move(noADL); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} |
| |
| WithADL adl; |
| std::ranges::iter_move(adl); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} |
| } |