checkpoint

Gameboard.ShogiUI.BoardState/Array2D.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Gameboard.ShogiUI.BoardState
+{
+  public class Array2D<T> : IEnumerable
+  {
+    private readonly T[] array;
+    private readonly int width;
+
+    public Array2D(int width, int height)
+    {
+      this.width = width;
+      array = new T[width * height];
+    }
+
+    public T this[int x, int y]
+    {
+      get => array[y * width + x];
+      set => array[y * width + x] = value;
+    }
+
+    IEnumerator IEnumerable.GetEnumerator() => array.GetEnumerator();
+  }
+}