std::packaged_task<R(Args...)>::reset - cppreference.com (original) (raw)

| void reset(); | | (since C++11) | | ------------- | | ------------- |

Resets the state abandoning the results of previous executions. New shared state is constructed.

Equivalent to *this = packaged_task(std::move(f)), where f is the stored task.

[edit] Parameters

(none)

[edit] Return value

(none)

[edit] Exceptions

• std::future_error if *this has no shared state. The error condition is set to no_state.
• std::bad_alloc if there was not enough memory for a new shared state.
• Any exception thrown by the move constructor of the new packaged_task.

[edit] Example

#include #include #include #include   int main() { std::packaged_task<int(int,int)> task([](int a, int b) { return std::pow(a, b); }); std::future result = task.get_future(); task(2, 9); std::cout << "2^9 = " << result.get() << '\n';   task.reset(); result = task.get_future(); std::thread task_td(std::move(task), 2, 10); task_td.join(); std::cout << "2^10 = " << result.get() << '\n'; }

Output: