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std::packaged_task::operator=

From cppreference.com
packaged_task& operator=(const packaged_task&) = delete;
(1)
packaged_task& operator=(packaged_task&& rhs)
(2)
1) Copy assignment operator is deleted, std::packaged_task is move-only.

Note: C++11 does not specify const here, this is the defect 2067.

2) Releases the shared state, if any, destroys the previously-held task, and moves the shared state and the task owned by rhs into *this. rhs is left without a shared state and with a moved-from task.

[edit] Parameters

rhs - the std::packaged_task to move from

[edit] Exceptions

2)
noexcept specification:  
noexcept
  (since C++11)

[edit] Example