7#define HB_MUTEX_IMPL_INIT UNUSED
8#define hb_mutex_impl_init(M) HB_STMT_START { new (M) hb_mutex_impl_t; } HB_STMT_END
9#define hb_mutex_impl_lock(M) (M)->lock ()
10#define hb_mutex_impl_unlock(M) (M)->unlock ()
11#define hb_mutex_impl_finish(M) HB_STMT_START { (M)->~hb_mutex_impl_t(); } HB_STMT_END
std::mutex hb_mutex_impl_t