32 Thread support library [thread]

32.5 Mutual exclusion [thread.mutex]

32.5.5 Locks [thread.lock]

32.5.5.5 Class template shared_­lock [thread.lock.shared]

32.5.5.5.4 Modifiers [thread.lock.shared.mod]

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void swap(shared_lock& sl) noexcept;
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Effects: Swaps the data members of *this and sl.
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mutex_type* release() noexcept;
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Postconditions: pm == nullptr and owns == false.
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Returns: The previous value of pm.
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template<class Mutex> void swap(shared_lock<Mutex>& x, shared_lock<Mutex>& y) noexcept;
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Effects: As if by x.swap(y).