| //===----------------------------------------------------------------------===// |
| // |
| // 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: libcpp-has-no-threads |
| |
| // [[nodiscard]] on constructors isn't supported by all compilers |
| // UNSUPPORTED: clang-6, clang-7, clang-8, clang-9 |
| // UNSUPPORTED: apple-clang-9, apple-clang-10, apple-clang-11 |
| |
| // [[nodiscard]] isn't supported in C++98 and C++03 (not even as an extension) |
| // UNSUPPORTED: c++98, c++03 |
| |
| // <mutex> |
| |
| // template <class Mutex> class lock_guard; |
| |
| // [[nodiscard]] explicit lock_guard(mutex_type& m); |
| // [[nodiscard]] lock_guard(mutex_type& m, adopt_lock_t); |
| |
| // Test that we properly apply [[nodiscard]] to lock_guard's constructors, |
| // which is a libc++ extension. |
| |
| // MODULES_DEFINES: _LIBCPP_ENABLE_NODISCARD |
| #define _LIBCPP_ENABLE_NODISCARD |
| #include <mutex> |
| |
| int main(int, char**) { |
| std::mutex m; |
| std::lock_guard<std::mutex>{m}; // expected-error{{ignoring temporary created by a constructor declared with 'nodiscard' attribute}} |
| std::lock_guard<std::mutex>{m, std::adopt_lock}; // expected-error{{ignoring temporary created by a constructor declared with 'nodiscard' attribute}} |
| return 0; |
| } |