I'm encountering something very weird when using packaged tasks. When reading ~packaged_task I get the impression that if a std::packaged_task is destroyed before it is executed, the promise will be broken and an attempt to get the result from the future should throw std::future_error.
However, on Visual Studio 2013 this doesn't seem to be the case. Take this following code:
#include <iostream>
#include <future>
#include <functional>
int main() {
std::future<int> f;
{
std::packaged_task<int()> task([](){return 3; });
f = task.get_future();
}
std::cout<<f.get()<<std::endl;
return 0;
}
I'm expecting to get an std::future_error on f.get() but instead it blocks, waiting for the packaged task to be executed.
Trying another compiler: http://ideone.com/Wt0WOc does indeed throw a std::future_error("Broken promise")...
Am I seeing a bug in Visual Studio 2013 or have I missed something?
