Re: Returning ranges from a function (was: How to loop (elegant) throug a vector ?)

[Maciej Sobczak <see.my.homepage@gmail.com>]

On 20 Cze, 19:12, Stefan Bellon <bel...@software-erosion.org> wrote:

> Now you can do the following:
>
>    function Get_Range
>      return Integer_Range_Objects.Range_Type
>    is
>    begin
>       return (42 .. 128 => <>);
>    end Get_Range;
>
> And then:
>
>    for I in Get_Range'Range loop
>       Do_Something (I);
>    end loop;
>
> It's not as elegant as I wished (because of the additional 'Range), but
> it is simple and light-weight enough to be usable.

As far as I can tell, it creates the physical array that might not be
necessarily optimized out by the compiler. You need to store it
somewhere.
It would be nicer to return a "range" that is not dependent on memory
constraints. See xrange in Python.

--
Maciej Sobczak * www.msobczak.com * www.inspirel.com