#
template<typename T>
tf::Future class

class to access the result of an execution

tf::Future is a derived class from std::future that will eventually hold the execution result of a submitted taskflow (tf::Executor::run) or an asynchronous task (tf::Executor::async, tf::Executor::silent_async). In addition to the base methods inherited from std::future, you can call tf::Future::cancel to cancel the execution of the running taskflow associated with this future object. The following example cancels a submission of a taskflow that contains 1000 tasks each running one second.

    tf::Executor executor;
    tf::Taskflow taskflow;

    for(int i=0; i<1000; i++) {
      taskflow.emplace([](){
        std::this_thread::sleep_for(std::chrono::seconds(1));
      });
    }

    // submit the taskflow
    tf::Future fu = executor.run(taskflow);

    // request to cancel the submitted execution above
    fu.cancel();

    // wait until the cancellation finishes
    fu.get();

## Constructors, destructors, conversion operators

Future() defaulted
  default constructor
Future(const Future&) deleted
  disabled copy constructor
Future(Future&&) defaulted
  default move constructor

## Public functions

auto operator=(const Future&) -> Future& deleted
  disabled copy assignment
auto operator=(Future&&) -> Future& defaulted
  default move assignment
auto cancel() -> bool
  cancels the execution of the running taskflow associated with this future object

## Function documentation

###
template<typename T>
bool tf::Future<T>::cancel()

cancels the execution of the running taskflow associated with this future object

Returns | `true` if the execution can be cancelled or `false` if the execution has already completed

When you request a cancellation, the executor will stop scheduling any tasks onwards. Tasks that are already running will continue to finish (non-preemptive). You can call tf::Future::wait to wait for the cancellation to complete.

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