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 // mutex_type *mutex() const noexcept; 15 16 #include <shared_mutex> 17 #include <cassert> 18 19 #if _LIBCPP_STD_VER > 11 20 21 std::shared_timed_mutex m; 22 23 #endif // _LIBCPP_STD_VER > 11 24 25 int main() 26 { 27 #if _LIBCPP_STD_VER > 11 28 std::shared_lock<std::shared_timed_mutex> lk0; 29 assert(lk0.mutex() == nullptr); 30 std::shared_lock<std::shared_timed_mutex> lk1(m); 31 assert(lk1.mutex() == &m); 32 lk1.unlock(); 33 assert(lk1.mutex() == &m); 34 static_assert(noexcept(lk0.mutex()), "mutex() must be noexcept"); 35 #endif // _LIBCPP_STD_VER > 11 36 } 37
