/// <summary>
/// Adds a new callback to invoke if the future has an error.
/// </summary>
/// <param name="callback">The callback to invoke.</param>
/// <returns>The future so additional calls can be chained together.</returns>
public IFuture <T> OnError(FutureErrorCallback callback)
{
if (_state == FutureState.Error)
{
callback(this.error);
}
else if (_state != FutureState.Success && !_errorCallbacks.Contains(callback))
{
_errorCallbacks.Add(callback);
}
return(this);
}
public IFuture <TResult> OnError(FutureErrorCallback callback)
{
return(this.future.OnError(callback));
}
