Associative Ranges

[Freddy via Digitalmars-d]

On Sunday, 3 August 2014 at 08:50:47 UTC, Marc Schütz wrote:
> On Sunday, 3 August 2014 at 06:19:12 UTC, Freddy wrote:
>> On Friday, 1 August 2014 at 23:57:37 UTC, Freddy wrote:
>>> I just curious, do Associative Ranges exist. If so where can i
>>> find them. I started thinking about them when i asked this
>>> question:
>>> http://forum.dlang.org/thread/vauuognmhvtjrktazyeb@forum.dlang.org
>> I started a phobos fork for this, what do you think so far
>> https://github.com/Superstar64/phobos/blob/60d3472b1056b298319976f105aa3b9b3f165e97/std/range.d#L1357-1420
>
> Nice!
>
> A few comments after a cursory glance:
>
> 1) "aligns" sounds strange, use "corresponds" instead.
>
> 2) It would be preferable that associative ranges mimic 
> built-in associative arrays as closely as possible, i.e. the 
> range members should be called `byKey` and `byValue`, and it 
> should allow iteration over the associative range directly, 
> instead of using the `range` member.
>
> 3) For the value and key ranges, there should be a guarantee 
> that they can be zipped through, i.e. that the elements in them 
> are in the same order so keys and values correspond to each 
> other. The built-in associative arrays provide `byKey` and 
> `byValue`, which satisfy this condition.
Also won't the implicit range make it hard to implement function
like map (should you map to whole range or to the value)