RectGrid.opApply

1 auto myGrid = rectGrid([
2   [ 00, 01, 02, 03, 04 ],
3   [ 10, 11, 12, 13, 14 ],
4   [ 20, 21, 22, 23, 24 ],
5 ]);
6 
7 int[] actual;
8 foreach(tile ; myGrid) { actual ~= tile; }
9 
10 assert(actual == [
11     00, 01, 02, 03, 04,
12     10, 11, 12, 13, 14,
13     20, 21, 22, 23, 24]);