std::shared_lock::owns_lock (3) Linux Manual Page

std::shared_lock<Mutex>::owns_lock – std::shared_lock<Mutex>::owns_lock

Synopsis

bool owns_lock() const noexcept; (since C++14)
Checks whether *this owns a locked mutex or not.

Parameters

(none)

Return value

true if *this has an associated mutex and has acquired shared ownership of it, false otherwise.

See also

              tests whether the lock owns its associated mutex
operator_bool (public member function)