1//===----------------------------------------------------------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is dual licensed under the MIT and the University of Illinois Open 6// Source Licenses. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9 10// <shared_mutex> 11 12// template <class Mutex> class shared_lock; 13 14// explicit operator bool() const noexcept; 15 16#include <shared_mutex> 17#include <cassert> 18 19#if _LIBCPP_STD_VER > 11 20 21std::shared_timed_mutex m; 22 23#endif // _LIBCPP_STD_VER > 11 24 25int main() 26{ 27#if _LIBCPP_STD_VER > 11 28 std::shared_lock<std::shared_timed_mutex> lk0; 29 assert(static_cast<bool>(lk0) == false); 30 std::shared_lock<std::shared_timed_mutex> lk1(m); 31 assert(static_cast<bool>(lk1) == true); 32 lk1.unlock(); 33 assert(static_cast<bool>(lk1) == false); 34 static_assert(noexcept(static_cast<bool>(lk0)), "explicit operator bool() must be noexcept"); 35#endif // _LIBCPP_STD_VER > 11 36} 37