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std::unique...peratorbool(3)  C++ Standard Libary std::unique...peratorbool(3)

NAME
       std::unique_lock::operatorbool -	std::unique_lock::operatorbool

Synopsis
	  explicit operator bool() const noexcept;  (since C++11)

	  Checks  whether  *this owns a	locked mutex or	not. Effectively calls
       owns_lock().

Parameters
	  (none)

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

See also
	  owns_lock tests whether the lock owns	(i.e., has locked) its associ-
       ated mutex
		    (public member function)

http://cppreference.com		  2022.07.31	  std::unique...peratorbool(3)

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