Initial commit

Numbers/NumberString/DigitEnumerator.cs

@@ -0,0 +1,53 @@
+using System.Collections;
+
+namespace Numbers.NumberString;
+
+/// <summary>
+///     Allows to enumerate only the digits in a string
+/// </summary>
+/// <inheritdoc cref="IEnumerator{T}"/>
+public sealed class DigitEnumerator : IEnumerator<int>
+{
+    // TODO
+    // private readonly string _text;
+    // private int _index;
+
+    /// <summary>
+    ///     Creates a new instance of <see cref="DigitEnumerator"/> based on the given text.
+    ///     This will be called within <see cref="NumberString.GetEnumerator"/>.
+    /// </summary>
+    /// <param name="text">The text to iterate over (containing both letters and digits)</param>
+    public DigitEnumerator(string text)
+    {
+        // TODO
+    }
+
+    public bool MoveNext()
+    {
+        // TODO
+        return false;
+    }
+
+    public void Reset()
+    {
+        // TODO
+    }
+
+    public int Current
+    {
+        get
+        {
+            // TODO
+            return -1;
+
+            //static int GetDigit(char c) => c - '0';
+        }
+    }
+
+    object IEnumerator.Current => null!; // TODO
+
+    public void Dispose()
+    {
+        // TODO?
+    }
+}