1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // UNSUPPORTED: no-threads 10 // UNSUPPORTED: c++03, c++11, c++14, c++17 11 12 // <semaphore> 13 14 // constexpr explicit counting_semaphore(ptrdiff_t desired); 15 16 #include <semaphore> 17 #include <type_traits> 18 19 #include "test_macros.h" 20 21 static_assert(!std::is_default_constructible<std::binary_semaphore>::value, ""); 22 static_assert(!std::is_default_constructible<std::counting_semaphore<>>::value, ""); 23 24 static_assert(!std::is_convertible<int, std::binary_semaphore>::value, ""); 25 static_assert(!std::is_convertible<int, std::counting_semaphore<>>::value, ""); 26 27 #if TEST_STD_VER > 17 28 // Test constexpr-constructibility. (But not destructibility.) 29 constinit std::binary_semaphore bs(1); 30 constinit std::counting_semaphore<> cs(1); 31 #endif 32