Converting array in to aliased tuple type.

[visitor]

On Monday, 25 December 2017 at 21:11:08 UTC, aliak wrote:
> On Monday, 25 December 2017 at 17:59:54 UTC, visitor wrote:
>> On Monday, 25 December 2017 at 15:03:08 UTC, aliak wrote:
>>> On Monday, 25 December 2017 at 14:08:08 UTC, Mengu wrote:
>>>>
>>> I was kind of hoping for some magical D variadic alias 
>>> template on Tuple or something that will just deconstruct the 
>>> arguments in to tuple components.
>>
>> i don't think it's better but :
>>
>> https://run.dlang.io/is/2rgOzh
>
> Heh, no it's probably not, but interesting! So it does work 
> with a static array. Is it that .array on a range is not able 
> to infer a size and hence produce a static array for the given 
> situation? Is this a D limitation, a logical one or maybe just 
> not implemented yet?
>
> Cheers!

i don't know the reason, and would be glad to be unlighted :)
There is a Tuple constructor which takes a static array as a 
param :
https://dlang.org/phobos/std_typecons.html#.Tuple.this.2
i needed to iterate with an index when building the static array 
later, so i transformed the range (a.split(',').map!(to!int)) 
into a dynamic array, to do so.
one could use std.range enumerate() instead:

auto points = data.split(':')
                   .map!( a => a.split(',').map!(to!int) )
                   .map!( (a) {
                       int[2] staticArray;
                       foreach (i, el; a.enumerate()) 
staticArray[i] = el;
                       return staticArray;
                   } )
                   .map!Point;

Cheers