std::unique_lock<Mutex>:: operator=

unique_lock & operator = ( unique_lock && other ) ;		(since C++11)

Move assignment operator. Replaces the contents with those of other using move semantics.

If prior to the call * this has an associated mutex and has acquired ownership of it, the mutex is unlocked.

Parameters

other

-

another unique_lock to replace the state with

Return value

* this

Exceptions

Throws nothing.

Notes

With a recursive mutex it is possible for both * this and other to own the same mutex before the assignment. In this case, * this will own the mutex after the assignment and other will not.

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 2104	C++11	the move assignment operator was noexcept , but it may throw an exception in the case of undefined behavior [1]	it is not noexcept

1. ↑ For example, * this is constructed with std::adopt_lock , but the calling thread does not have the ownership of the associated mutex. In this case, * this cannot properly release the ownership of the associated mutex, and it may result in an exception to be thrown.