std::unique_lock<Mutex>::operator=
From cppreference.com
< cpp | thread | unique lock
| 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 |
- ↑ 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.