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Showing content from https://en.cppreference.com/w/cpp/algorithm/../ranges/../thread/shared_lock.html below:

std::shared_lock - cppreference.com

template< class Mutex > class shared_lock;

(since C++14)

The class shared_lock is a general-purpose shared mutex ownership wrapper allowing deferred locking, timed locking and transfer of lock ownership. Locking a shared_lock locks the associated shared mutex in shared mode (to lock it in exclusive mode, std::unique_lock can be used).

The shared_lock class is movable, but not copyable – it meets the requirements of MoveConstructible and MoveAssignable but not of CopyConstructible or CopyAssignable.

shared_lock meets the Lockable requirements. If Mutex meets the SharedTimedLockable requirements, shared_lock also meets TimedLockable requirements.

In order to wait in a shared mutex in shared ownership mode, std::condition_variable_any can be used (std::condition_variable requires std::unique_lock and so can only wait in unique ownership mode).

[edit] Template parameters Mutex - the type of the shared mutex to lock. The type must meet the SharedLockable requirements [edit] Member types Type Definition mutex_type Mutex [edit] Member functions constructs a shared_lock, optionally locking the supplied mutex
(public member function) [edit] unlocks the associated mutex
(public member function) [edit] unlocks the mutex, if owned, and acquires ownership of another
(public member function) [edit] Shared locking locks the associated mutex
(public member function) [edit] tries to lock the associated mutex
(public member function) [edit] tries to lock the associated mutex, for the specified duration
(public member function) [edit] tries to lock the associated mutex, until a specified time point
(public member function) [edit] unlocks the associated mutex
(public member function) [edit] Modifiers swaps the data members with another shared_lock
(public member function) [edit] disassociates the mutex without unlocking
(public member function) [edit] Observers returns a pointer to the associated mutex
(public member function) [edit] tests whether the lock owns its associated mutex
(public member function) [edit] tests whether the lock owns its associated mutex
(public member function) [edit] [edit] Non-member functions [edit] Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior LWG 2981 C++17 redundant deduction guide from shared_lock<Mutex> was provided removed

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