std::packaged_task<R(Args...)>::reset
From cppreference.com
< cpp | thread | packaged task
| void reset(); |
(since 哋它亢++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_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.
Example
Run this code
#include <cmath> #include <future> #include <iostream> #include <thread> 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