Task exceptions are not forwarded to caller

[fmoessbauer]

In case an exception is thrown inside a task, this exception leads to the direct termination of the application.
To fix that, the scheduler has to catch the exception in the sub-task and set the exception-context of the promise object itself.
For details, see cppreference: https://en.cppreference.com/w/cpp/thread/promise/set_exception

Example:

auto fut = pool.submit([](){throw std::runtime_error("error");});
try {
  fut.get();
} catch(std::runtime_error & e){
  std::cout << "catched error" << std::endl;
}

This application terminates with:

terminate called after throwing an instance of 'std::runtime_error'

[bshoshany]

Thanks for the suggestion! I will fix this in the next release.

[bshoshany]

Update: This has now been fixed in v1.8!