From 8db135a94d177c3114a300a64b1f22f5eaf323f9 Mon Sep 17 00:00:00 2001
From: Ben Harris <ben@tilde.team>
Date: Mon, 15 Apr 2024 23:19:34 -0400
Subject: [PATCH] add ReadOnlySpan fast number parsers

---
 AOC.Common/Util.cs | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/AOC.Common/Util.cs b/AOC.Common/Util.cs
index 6cca8bf..f8b2cf5 100644
--- a/AOC.Common/Util.cs
+++ b/AOC.Common/Util.cs
@@ -14,4 +14,20 @@ public static class Util
             b = a1 % b;
         }
     }
+
+    public static int ParseIntFast(ReadOnlySpan<char> span)
+    {
+        var result = 0;
+        for (var i = 0; i < span.Length; i++)
+            result = result * 10 + span[i] - '0';
+        return result;
+    }
+
+    public static long ParseLongFast(ReadOnlySpan<char> span)
+    {
+        var result = 0L;
+        for (var i = 0; i < span.Length; i++)
+            result = result * 10 + span[i] - '0';
+        return result;
+    }
 }