33 Thread support library [thread]

33.4 Mutual exclusion [thread.mutex]

33.4.4 Locks [thread.lock]

33.4.4.3 Class template unique_­lock [thread.lock.unique]

33.4.4.3.3 unique_­lock modifiers [thread.lock.unique.mod]

void swap(unique_lock& u) noexcept;

mutex_type* release() noexcept;

template <class Mutex> void swap(unique_lock<Mutex>& x, unique_lock<Mutex>& y) noexcept;