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// UNSUPPORTED: libcpp-has-no-threads 11// UNSUPPORTED: c++98, c++03, c++11 12 13// <shared_mutex> 14 15// template <class Mutex> class shared_lock; 16 17// shared_lock(); 18 19#include <shared_mutex> 20#include <cassert> 21 22int main() 23{ 24 std::shared_lock<std::shared_timed_mutex> ul; 25 assert(!ul.owns_lock()); 26 assert(ul.mutex() == nullptr); 27} 28