[TDPL] arrays of D future

[Lutger]

 wrote:

> Andrei,
> 
> I must say that the reading is absolutely enjoyable. I do have one
> question regarding the StackImpl example on page 234. Are you forecasting
> future functionality that arrays will support with your use of .empty, .back,
> and .popBack or am I too na�ve to understand that I need to implement this
> functionality in order for your example to compile?

These functions are implemented in std.array, you only need to import that 
module.