Re: Converting array in to aliased tuple type.

[Mengu via Digitalmars-d-learn]

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);