Function discardPromises

3rdparty/libprocess/include/process/future.hpp:1879–1886

// Helper for discarding a set of Promises.
template <typename T>
void discardPromises(std::set<Promise<T>*>* promises)
{
  foreach (Promise<T>* promise, *promises) {
    promise->discard();
    delete promise;
  }
  promises->clear();
}


// Helper for discarding an individual promise in the set.