std::shared_lock::operator= (3) Linux Manual Page

std::shared_lock<Mutex>::operator= – std::shared_lock<Mutex>::operator=

Synopsis

shared_lock& operator=( shared_lock&& other ) noexcept;  (since C++14)

Move assignment operator. Replaces the contents with those of other using move semantics.
If, prior to this call, *this has an associated mutex ((mutex() returns a non-null pointer) and has acquired ownership of it (owns() returns true), the mutex is unlocked by calling unlock_shared().
After this call, other has no associated mutex.

Parameters

other – another shared_lock to replace the state with

Return value

*this