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 // <latch> 13 14 // inline constexpr explicit latch(ptrdiff_t __expected); 15 16 // Make sure that the ctor of latch is constexpr and explicit. 17 18 #include <latch> 19 20 #include "test_convertible.h" 21 22 static_assert(!test_convertible<std::latch, std::ptrdiff_t>(), "This constructor must be explicit"); 23 24 constexpr bool test() { 25 std::latch l(5); 26 (void)l; 27 return true; 28 } 29 30 int main(int, char**) { 31 test(); 32 static_assert(test(), ""); 33 34 return 0; 35 } 36