Static Length Propagation of Ranges

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On Thursday, 20 October 2016 at 13:05:05 UTC, Nordlöw wrote:
> On Thursday, 20 October 2016 at 12:38:40 UTC, Nordlöw wrote:
>> ElementType!R[n] arrayN(size_t n, R)(R r)
>> {
>>     assert(r.length == n);
>>     typeof(return) dst;
>>     import std.algorithm.mutation : copy;
>>     r.copy(dst[]);
>>     return dst;
>> }
>
> Is there a place for part of this logic in Phobos?
>
> I'm thinking perhaps array{N,Exactly} should be added to 
> std.array.
>
> The idea came to me after learning about dependent types in 
> Idris:
>
> http://www.idris-lang.org/

There was a pull request awhile back for a small function that 
creates fixed-length arrays, but I think it was only intended to 
create them from dynamic arrays (such as `auto sarr = [1, 2, 
3].staticArray`). Personally I think it would be nice to have a 
version of `array` that creates a static array, but I don't know 
how often it would be used or what the pitfalls are, if any.