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.
Parameters
(none).
Return value
(none).
Exceptions
-
std::future_errorif*thishas no shared state. The error condition is set tono_state. -
std::bad_allocif there was not enough memory for a new shared state. - any exception thrown by the move constructor of the new
packaged_task
Example
#include <iostream>
#include <cmath>
#include <thread>
#include <future>
int main()
{
std::packaged_task<int(int,int)> task([](int a, int b) {
return std::pow(a, b);
});
std::future<int> 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:
2^9 = 512 2^10 = 1024
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