convert string of int to array of int

Question

Suppose I need to read a line from a file, containing an unknown number of space separated ints. How can I read a line and convert it into an array of ints?

What is one simple way of solving this problem in D?

My current non working attempt.

auto f = File("in");
foreach(line; f.byLine()){
  int[] arr;
  foreach(num; line.split())
    arr[] = cast(int)num;
}

Answer 1

Using splitter, map and array:

import std.algorithm : map, splitter;
import std.stdio : File;
import std.conv : to;
import std.array : array;

void main(string[] args)
{
    // range result
    auto result = File("in")
        .byLine
        .map!((line) => splitter(line).map!((a) => to!int(a)));

    // multidimensioanl array result
    int[][] resultArr = File("in")
        .byLine
        .map!((line) => splitter(line).map!((a) => to!int(a)).array).array;

}