Converting array in to aliased tuple type.

[Mengu]

On Monday, 25 December 2017 at 12:03:32 UTC, aliak wrote:
> Hi, been looking for a way to convert an array to a tuple, but 
> can't seem to find one. Is there one?
>
> Looking for something like:
>
> alias Point = Tuple!(int, "x", int, "y");
> enum data = "1,2:8,9";
> auto points = data
>   .split(':')
>   .map!(a => a
>     .split(',')
>     .map!(to!int)
>   )
>   .map!Point; // <-- this works if you do `.map!(a => 
> Point(a[0], a[1]));` instead
>
> Cheers!

hi aliak

since Point is a Tuple and does not have a constructor that takes 
a list of integers (int[]), you should have a helper function.

     import std.stdio: writeln;
     import std.string: split;
     import std.algorithm: map;
     import std.typecons: Tuple;
     import std.conv: to;

     alias Point = Tuple!(int, "x", int, "y");
     enum data = "1,2:8,9";
     alias makePoint = (auto ref points) => Point(points[0], 
points[1]);
     alias convertToInt = (string parts) => 
parts.split(',').map!(to!int);
     auto points = 
data.split(':').map!(convertToInt).map!(makePoint);

     writeln(points);