Get the result stored in the future
Set the future's state to raised exception
Launch a new fiber that will run the specified callback, set the future when the callback returns
Launch a new fiber that will run the specified callback, set the future when the callback returns
Sets the future with no value
Sets the future with value
Wait for the future to be set
Returns the exception stored in the future's result (if any)
Returns whether the future has a return value
Representation for future calculation result