14 lines · c
1#pragma clang system_header2 3namespace std {4struct mutex {5 void lock();6 void unlock();7};8 9template <typename T> struct lock_guard {10 lock_guard(std::mutex &);11 ~lock_guard();12};13} // namespace std14 1#pragma clang system_header2 3namespace std {4struct mutex {5 void lock();6 void unlock();7};8 9template <typename T> struct lock_guard {10 lock_guard(std::mutex &);11 ~lock_guard();12};13} // namespace std14